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Condensed matter physics
Condensed matter physics
is a branch of physics that deals with the physical properties of condensed phases of matter,[1] where particles adhere to each other. Condensed matter physicists seek to understand the behavior of these phases by using physical laws. In particular, they include the laws of quantum mechanics, electromagnetism and statistical mechanics. The most familiar condensed phases are solids and liquids while more exotic condensed phases include the superconducting phase exhibited by certain materials at low temperature, the ferromagnetic and antiferromagnetic phases of spins on crystal lattices of atoms, and the Bose–Einstein condensate
Bose–Einstein condensate
found in ultracold atomic systems. The study of condensed matter physics involves measuring various material properties via experimental probes along with using methods of theoretical physics to develop mathematical models that help in understanding physical behavior. The diversity of systems and phenomena available for study makes condensed matter physics the most active field of contemporary physics: one third of all American physicists self-identify as condensed matter physicists,[2] and the Division of Condensed Matter Physics
Physics
is the largest division at the American Physical Society.[3] The field overlaps with chemistry, materials science, and nanotechnology, and relates closely to atomic physics and biophysics. The theoretical physics of condensed matter shares important concepts and methods with that of particle physics and nuclear physics.[4] A variety of topics in physics such as crystallography, metallurgy, elasticity, magnetism, etc., were treated as distinct areas until the 1940s, when they were grouped together as solid state physics. Around the 1960s, the study of physical properties of liquids was added to this list, forming the basis for the new, related specialty of condensed matter physics.[5] According to physicist Philip Warren Anderson, the term was coined by him and Volker Heine, when they changed the name of their group at the Cavendish Laboratories, Cambridge
Cambridge
from Solid
Solid
state theory to Theory of Condensed Matter
Matter
in 1967,[6] as they felt it did not exclude their interests in the study of liquids, nuclear matter, and so on.[7] Although Anderson and Heine helped popularize the name "condensed matter", it had been present in Europe for some years, most prominently in the form of a journal published in English, French, and German by Springer-Verlag titled Physics
Physics
of Condensed Matter, which was launched in 1963.[8] The funding environment and Cold War politics of the 1960s and 1970s were also factors that lead some physicists to prefer the name "condensed matter physics", which emphasized the commonality of scientific problems encountered by physicists working on solids, liquids, plasmas, and other complex matter, over "solid state physics", which was often associated with the industrial applications of metals and semiconductors.[9] The Bell Telephone Laboratories was one of the first institutes to conduct a research program in condensed matter physics.[5] References to "condensed" state can be traced to earlier sources. For example, in the introduction to his 1947 book Kinetic Theory of Liquids,[10] Yakov Frenkel
Yakov Frenkel
proposed that "The kinetic theory of liquids must accordingly be developed as a generalization and extension of the kinetic theory of solid bodies. As a matter of fact, it would be more correct to unify them under the title of 'condensed bodies'".

Contents

1 History

1.1 Classical physics 1.2 Advent of quantum mechanics 1.3 Modern many-body physics

2 Theoretical

2.1 Emergence 2.2 Electronic theory of solids 2.3 Symmetry breaking 2.4 Phase transition

3 Experimental

3.1 Scattering 3.2 External magnetic fields 3.3 Cold atomic gases

4 Applications 5 See also 6 Notes 7 References 8 Further reading

History[edit] Classical physics[edit]

Heike Kamerlingh Onnes
Heike Kamerlingh Onnes
and Johannes van der Waals
Johannes van der Waals
with the helium liquefactor in Leiden
Leiden
(1908)

One of the first studies of condensed states of matter was by English chemist Humphry Davy, in the first decades of the nineteenth century. Davy observed that of the forty chemical elements known at the time, twenty-six had metallic properties such as lustre, ductility and high electrical and thermal conductivity.[11] This indicated that the atoms in John Dalton's atomic theory were not indivisible as Dalton claimed, but had inner structure. Davy further claimed that elements that were then believed to be gases, such as nitrogen and hydrogen could be liquefied under the right conditions and would then behave as metals.[12][notes 1] In 1823, Michael Faraday, then an assistant in Davy's lab, successfully liquefied chlorine and went on to liquefy all known gaseous elements, except for nitrogen, hydrogen, and oxygen.[11] Shortly after, in 1869, Irish chemist Thomas Andrews studied the phase transition from a liquid to a gas and coined the term critical point to describe the condition where a gas and a liquid were indistinguishable as phases,[14] and Dutch physicist Johannes van der Waals supplied the theoretical framework which allowed the prediction of critical behavior based on measurements at much higher temperatures.[15]:35–38 By 1908, James Dewar
James Dewar
and Heike Kamerlingh Onnes were successfully able to liquefy hydrogen and then newly discovered helium, respectively.[11] Paul Drude
Paul Drude
in 1900 proposed the first theoretical model for a classical electron moving through a metallic solid.[4] Drude's model described properties of metals in terms of a gas of free electrons, and was the first microscopic model to explain empirical observations such as the Wiedemann–Franz law.[16][17]:27–29 However, despite the success of Drude's free electron model, it had one notable problem: it was unable to correctly explain the electronic contribution to the specific heat and magnetic properties of metals, and the temperature dependence of resistivity at low temperatures.[18]:366–368 In 1911, three years after helium was first liquefied, Onnes working at University of Leiden
Leiden
discovered superconductivity in mercury, when he observed the electrical resistivity of mercury to vanish at temperatures below a certain value.[19] The phenomenon completely surprised the best theoretical physicists of the time, and it remained unexplained for several decades.[20] Albert Einstein, in 1922, said regarding contemporary theories of superconductivity that "with our far-reaching ignorance of the quantum mechanics of composite systems we are very far from being able to compose a theory out of these vague ideas".[21] Advent of quantum mechanics[edit] Drude's classical model was augmented by Wolfgang Pauli, Arnold Sommerfeld, Felix Bloch
Felix Bloch
and other physicists. Pauli realized that the free electrons in metal must obey the Fermi–Dirac statistics. Using this idea, he developed the theory of paramagnetism in 1926. Shortly after, Sommerfeld incorporated the Fermi–Dirac statistics
Fermi–Dirac statistics
into the free electron model and made it better able to explain the heat capacity. Two years later, Bloch used quantum mechanics to describe the motion of a quantum electron in a periodic lattice.[18]:366–368 The mathematics of crystal structures developed by Auguste Bravais, Yevgraf Fyodorov
Yevgraf Fyodorov
and others was used to classify crystals by their symmetry group, and tables of crystal structures were the basis for the series International Tables of Crystallography, first published in 1935.[22] Band structure
Band structure
calculations was first used in 1930 to predict the properties of new materials, and in 1947 John Bardeen, Walter Brattain
Walter Brattain
and William Shockley
William Shockley
developed the first semiconductor-based transistor, heralding a revolution in electronics.[4]

A replica of the first point-contact transistor in Bell labs

In 1879, Edwin Herbert Hall
Edwin Herbert Hall
working at the Johns Hopkins University discovered a voltage developing across conductors transverse to an electric current in the conductor and magnetic field perpendicular to the current.[23] This phenomenon arising due to the nature of charge carriers in the conductor came to be termed the Hall effect, but it was not properly explained at the time, since the electron was experimentally discovered 18 years later. After the advent of quantum mechanics, Lev Landau
Lev Landau
in 1930 developed the theory of Landau quantization and laid the foundation for the theoretical explanation for the quantum Hall effect
Hall effect
discovered half a century later.[24]:458–460[25] Magnetism
Magnetism
as a property of matter has been known in China since 4000 BC.[26]:1–2 However, the first modern studies of magnetism only started with the development of electrodynamics by Faraday, Maxwell and others in the nineteenth century, which included classifying materials as ferromagnetic, paramagnetic and diamagnetic based on their response to magnetization.[27] Pierre Curie
Pierre Curie
studied the dependence of magnetization on temperature and discovered the Curie point phase transition in ferromagnetic materials.[26] In 1906, Pierre Weiss introduced the concept of magnetic domains to explain the main properties of ferromagnets.[28]:9 The first attempt at a microscopic description of magnetism was by Wilhelm Lenz and Ernst Ising through the Ising model
Ising model
that described magnetic materials as consisting of a periodic lattice of spins that collectively acquired magnetization.[26] The Ising model
Ising model
was solved exactly to show that spontaneous magnetization cannot occur in one dimension but is possible in higher-dimensional lattices. Further research such as by Bloch on spin waves and Néel
Néel
on antiferromagnetism led to developing new magnetic materials with applications to magnetic storage devices.[26]:36–38,48 Modern many-body physics[edit]

A magnet levitating above a high-temperature superconductor. Today some physicists are working to understand high-temperature superconductivity using the AdS/CFT correspondence.[29]

The Sommerfeld model and spin models for ferromagnetism illustrated the successful application of quantum mechanics to condensed matter problems in the 1930s. However, there still were several unsolved problems, most notably the description of superconductivity and the Kondo effect.[30] After World War II, several ideas from quantum field theory were applied to condensed matter problems. These included recognition of collective excitation modes of solids and the important notion of a quasiparticle. Russian physicist Lev Landau
Lev Landau
used the idea for the Fermi liquid
Fermi liquid
theory wherein low energy properties of interacting fermion systems were given in terms of what are now termed Landau-quasiparticles.[30] Landau also developed a mean field theory for continuous phase transitions, which described ordered phases as spontaneous breakdown of symmetry. The theory also introduced the notion of an order parameter to distinguish between ordered phases.[31] Eventually in 1965, John Bardeen, Leon Cooper
Leon Cooper
and John Schrieffer developed the so-called BCS theory of superconductivity, based on the discovery that arbitrarily small attraction between two electrons of opposite spin mediated by phonons in the lattice can give rise to a bound state called a Cooper pair.[32]

The quantum Hall effect: Components of the Hall resistivity as a function of the external magnetic field[33]:fig. 14

The study of phase transition and the critical behavior of observables, termed critical phenomena, was a major field of interest in the 1960s.[34] Leo Kadanoff, Benjamin Widom and Michael Fisher developed the ideas of critical exponents and widom scaling. These ideas were unified by Kenneth G. Wilson in 1972, under the formalism of the renormalization group in the context of quantum field theory.[34] The quantum Hall effect
Hall effect
was discovered by Klaus von Klitzing
Klaus von Klitzing
in 1980 when he observed the Hall conductance to be integer multiples of a fundamental constant

e

2

/

h

displaystyle e^ 2 /h

.(see figure) The effect was observed to be independent of parameters such as system size and impurities.[33] In 1981, theorist Robert Laughlin proposed a theory explaining the unanticipated precision of the integral plateau. It also implied that the Hall conductance can be characterized in terms of a topological invariable called Chern number.[35][36]:69, 74 Shortly after, in 1982, Horst Störmer
Horst Störmer
and Daniel Tsui observed the fractional quantum Hall effect
Hall effect
where the conductance was now a rational multiple of a constant. Laughlin, in 1983, realized that this was a consequence of quasiparticle interaction in the Hall states and formulated a variational method solution, named the Laughlin wavefunction.[37] The study of topological properties of the fractional Hall effect
Hall effect
remains an active field of research. In 1986, Karl Müller and Johannes Bednorz
Johannes Bednorz
discovered the first high temperature superconductor, a material which was superconducting at temperatures as high as 50 kelvins. It was realized that the high temperature superconductors are examples of strongly correlated materials where the electron–electron interactions play an important role.[38] A satisfactory theoretical description of high-temperature superconductors is still not known and the field of strongly correlated materials continues to be an active research topic. In 2009, David Field and researchers at Aarhus University
Aarhus University
discovered spontaneous electric fields when creating prosaic films[clarification needed] of various gases. This has more recently expanded to form the research area of spontelectrics.[39] In 2012 several groups released preprints which suggest that samarium hexaboride has the properties of a topological insulator [40] in accord with the earlier theoretical predictions.[41] Since samarium hexaboride is an established Kondo insulator, i.e. a strongly correlated electron material, the existence of a topological surface state in this material would lead to a topological insulator with strong electronic correlations. Theoretical[edit] Theoretical condensed matter physics involves the use of theoretical models to understand properties of states of matter. These include models to study the electronic properties of solids, such as the Drude model, the Band structure
Band structure
and the density functional theory. Theoretical models have also been developed to study the physics of phase transitions, such as the Ginzburg–Landau theory, critical exponents and the use of mathematical methods of quantum field theory and the renormalization group. Modern theoretical studies involve the use of numerical computation of electronic structure and mathematical tools to understand phenomena such as high-temperature superconductivity, topological phases, and gauge symmetries. Emergence[edit] Main article: Emergence Theoretical understanding of condensed matter physics is closely related to the notion of emergence, wherein complex assemblies of particles behave in ways dramatically different from their individual constituents.[32] For example, a range of phenomena related to high temperature superconductivity are understood poorly, although the microscopic physics of individual electrons and lattices is well known.[42] Similarly, models of condensed matter systems have been studied where collective excitations behave like photons and electrons, thereby describing electromagnetism as an emergent phenomenon.[43] Emergent properties can also occur at the interface between materials: one example is the lanthanum aluminate-strontium titanate interface, where two non-magnetic insulators are joined to create conductivity, superconductivity, and ferromagnetism. Electronic theory of solids[edit] Main article: Electronic band structure The metallic state has historically been an important building block for studying properties of solids.[44] The first theoretical description of metals was given by Paul Drude
Paul Drude
in 1900 with the Drude model, which explained electrical and thermal properties by describing a metal as an ideal gas of then-newly discovered electrons. He was able to derive the empirical Wiedemann-Franz law
Wiedemann-Franz law
and get results in close agreement with the experiments.[17]:90–91 This classical model was then improved by Arnold Sommerfeld
Arnold Sommerfeld
who incorporated the Fermi–Dirac statistics
Fermi–Dirac statistics
of electrons and was able to explain the anomalous behavior of the specific heat of metals in the Wiedemann–Franz law.[17]:101–103 In 1912, The structure of crystalline solids was studied by Max von Laue
Max von Laue
and Paul Knipping, when they observed the X-ray diffraction
X-ray diffraction
pattern of crystals, and concluded that crystals get their structure from periodic lattices of atoms.[17]:48[45] In 1928, Swiss physicist Felix Bloch
Felix Bloch
provided a wave function solution to the Schrödinger equation
Schrödinger equation
with a periodic potential, called the Bloch wave.[46] Calculating electronic properties of metals by solving the many-body wavefunction is often computationally hard, and hence, approximation methods are needed to obtain meaningful predictions.[47] The Thomas–Fermi theory, developed in the 1920s, was used to estimate system energy and electronic density by treating the local electron density as a variational parameter. Later in the 1930s, Douglas Hartree, Vladimir Fock
Vladimir Fock
and John Slater developed the so-called Hartree–Fock wavefunction as an improvement over the Thomas–Fermi model. The Hartree–Fock method
Hartree–Fock method
accounted for exchange statistics of single particle electron wavefunctions. In general, it's very difficult to solve the Hartree–Fock equation. Only the free electron gas case can be solved exactly.[44]:330–337 Finally in 1964–65, Walter Kohn, Pierre Hohenberg and Lu Jeu Sham proposed the density functional theory which gave realistic descriptions for bulk and surface properties of metals. The density functional theory (DFT) has been widely used since the 1970s for band structure calculations of variety of solids.[47] Symmetry breaking[edit] Main article: Symmetry breaking Some states of matter exhibit symmetry breaking, where the relevant laws of physics possess some symmetry that is broken. A common example is crystalline solids, which break continuous translational symmetry. Other examples include magnetized ferromagnets, which break rotational symmetry, and more exotic states such as the ground state of a BCS superconductor, that breaks U(1)
U(1)
phase rotational symmetry.[48][49] Goldstone's theorem in quantum field theory states that in a system with broken continuous symmetry, there may exist excitations with arbitrarily low energy, called the Goldstone bosons. For example, in crystalline solids, these correspond to phonons, which are quantized versions of lattice vibrations.[50] Phase transition[edit] Main article: Phase transition Phase transition
Phase transition
refers to the change of phase of a system, which is brought about by change in an external parameter such as temperature. Classical phase transition occurs at finite temperature when the order of the system was destroyed. For example, when ice melts and becomes water, the ordered crystal structure is destroyed. In quantum phase transitions, the temperature is set to absolute zero, and the non-thermal control parameter, such as pressure or magnetic field, causes the phase transitions when order is destroyed by quantum fluctuations originating from the Heisenberg uncertainty principle. Here, the different quantum phases of the system refer to distinct ground states of the Hamiltonian. Understanding the behavior of quantum phase transition is important in the difficult tasks of explaining the properties of rare-earth magnetic insulators, high-temperature superconductors, and other substances.[51] Two classes of phase transitions occur: first-order transitions and continuous transitions. For the later, the two phases involved do not co-exist at the transition temperature, also called critical point. Near the critical point, systems undergo critical behavior, wherein several of their properties such as correlation length, specific heat, and magnetic susceptibility diverge exponentially.[51] These critical phenomena poses serious challenges to physicists because normal macroscopic laws are no longer valid in the region and novel ideas and methods must be invented to find the new laws that can describe the system.[52]:75ff The simplest theory that can describe continuous phase transitions is the Ginzburg–Landau theory, which works in the so-called mean field approximation. However, it can only roughly explain continuous phase transition for ferroelectrics and type I superconductors which involves long range microscopic interactions. For other types of systems that involves short range interactions near the critical point, a better theory is needed.[53]:8–11 Near the critical point, the fluctuations happen over broad range of size scales while the feature of the whole system is scale invariant. Renormalization group
Renormalization group
methods successively average out the shortest wavelength fluctuations in stages while retaining their effects into the next stage. Thus, the changes of a physical system as viewed at different size scales can be investigated systematically. The methods, together with powerful computer simulation, contribute greatly to the explanation of the critical phenomena associated with continuous phase transition.[52]:11 Experimental[edit] Experimental condensed matter physics involves the use of experimental probes to try to discover new properties of materials. Such probes include effects of electric and magnetic fields, measuring response functions, transport properties and thermometry.[54] Commonly used experimental methods include spectroscopy, with probes such as X-rays, infrared light and inelastic neutron scattering; study of thermal response, such as specific heat and measuring transport via thermal and heat conduction.

Image of X-ray diffraction
X-ray diffraction
pattern from a protein crystal.

Scattering[edit] Further information: Scattering Several condensed matter experiments involve scattering of an experimental probe, such as X-ray, optical photons, neutrons, etc., on constituents of a material. The choice of scattering probe depends on the observation energy scale of interest. Visible light
Visible light
has energy on the scale of 1 electron volt (eV) and is used as a scattering probe to measure variations in material properties such as dielectric constant and refractive index. X-rays have energies of the order of 10 keV and hence are able to probe atomic length scales, and are used to measure variations in electron charge density.[55]:33–34 Neutrons can also probe atomic length scales and are used to study scattering off nuclei and electron spins and magnetization (as neutrons have spin but no charge). Coulomb and Mott scattering measurements can be made by using electron beams as scattering probes.[55]:33–34[56]:39–43 Similarly, positron annihilation can be used as an indirect measurement of local electron density.[57] Laser spectroscopy
Laser spectroscopy
is an excellent tool for studying the microscopic properties of a medium, for example, to study forbidden transitions in media with nonlinear optical spectroscopy.[52] :258–259 External magnetic fields[edit] In experimental condensed matter physics, external magnetic fields act as thermodynamic variables that control the state, phase transitions and properties of material systems.[58] Nuclear magnetic resonance (NMR) is a method by which external magnetic fields are used to find resonance modes of individual electrons, thus giving information about the atomic, molecular, and bond structure of their neighborhood. NMR experiments can be made in magnetic fields with strengths up to 60 Tesla. Higher magnetic fields can improve the quality of NMR measurement data.[59]:69[60]:185 Quantum oscillations is another experimental method where high magnetic fields are used to study material properties such as the geometry of the Fermi surface.[61] High magnetic fields will be useful in experimentally testing of the various theoretical predictions such as the quantized magnetoelectric effect, image magnetic monopole, and the half-integer quantum Hall effect.[59]:57 Cold atomic gases[edit]

The first Bose–Einstein condensate
Bose–Einstein condensate
observed in a gas of ultracold rubidium atoms. The blue and white areas represent higher density.

Main article: Optical lattice Ultracold atom trapping in optical lattices is an experimental tool commonly used in condensed matter physics, and in atomic, molecular, and optical physics. The method involves using optical lasers to form an interference pattern, which acts as a lattice, in which ions or atoms can be placed at very low temperatures. Cold atoms in optical lattices are used as quantum simulators, that is, they act as controllable systems that can model behavior of more complicated systems, such as frustrated magnets.[62] In particular, they are used to engineer one-, two- and three-dimensional lattices for a Hubbard model with pre-specified parameters, and to study phase transitions for antiferromagnetic and spin liquid ordering.[63][64] In 1995, a gas of rubidium atoms cooled down to a temperature of 170 nK was used to experimentally realize the Bose–Einstein condensate, a novel state of matter originally predicted by S. N. Bose
S. N. Bose
and Albert Einstein, wherein a large number of atoms occupy one quantum state.[65] Applications[edit]

Computer simulation of nanogears made of fullerene molecules. It is hoped that advances in nanoscience will lead to machines working on the molecular scale.

Research in condensed matter physics has given rise to several device applications, such as the development of the semiconductor transistor,[4] laser technology,[52] and several phenomena studied in the context of nanotechnology.[66]:111ff Methods such as scanning-tunneling microscopy can be used to control processes at the nanometer scale, and have given rise to the study of nanofabrication.[67] In quantum computation, information is represented by quantum bits, or qubits. The qubits may decohere quickly before useful computation is completed. This serious problem must be solved before quantum computing may be realized. To solve this problem, several promising approaches are proposed in condensed matter physics, including Josephson junction
Josephson junction
qubits, spintronic qubits using the spin orientation of magnetic materials, or the topological non-Abelian anyons from fractional quantum Hall effect
Hall effect
states.[67] Condensed matter physics
Condensed matter physics
also has important uses for biophysics, for example, the experimental method of magnetic resonance imaging, which is widely used in medical diagnosis.[67] See also[edit]

Soft matter Green–Kubo relations Green's function (many-body theory) Materials science Comparison of software for molecular mechanics modeling Transparent materials Orbital magnetization Symmetry in quantum mechanics Mesoscopic physics

Notes[edit]

^ Both hydrogen and nitrogen have since been liquified, however ordinary liquid nitrogen and hydrogen do not possess metallic properties. Physicists Eugene Wigner
Eugene Wigner
and Hillard Bell Huntington predicted in 1935[13] that a state metallic hydrogen exists at sufficiently high pressures (over 25 GPa), however this has not yet been observed.

References[edit]

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Further reading[edit]

Mudry, Christopher (2014). Lecture Notes on Field Theory in Condensed Matter
Matter
Physics. World Scientific. ISBN 978-981-4449-10-6.  Khan, Abdul Qadeer (21 November 1998). "Dimensional Anistrophy in Condensed Matter
Matter
Physics" (PDF). Seven National Symposium on Frontiers in Physics. 7. 7 (7). Retrieved 21 October 2012.  P. M. Chaikin and T. C. Lubensky (2000). Principles of Condensed Matter
Matter
Physics, Cambridge
Cambridge
University Press; 1st edition, ISBN 0-521-79450-1 Alexander Altland and Ben Simons (2006). Condensed Matter
Matter
Field Theory, Cambridge
Cambridge
University Press, ISBN 0-521-84508-4 Michael P. Marder (2010). Condensed Matter
Matter
Physics, second edition, John Wiley and Sons, ISBN 0-470-61798-5 Lillian Hoddeson, Ernest Braun, Jürgen Teichmann and Spencer Weart, eds. (1992). Out of the Crystal Maze: Chapters from the History of Solid
Solid
State Physics, Oxford University Press, ISBN 0-19-505329-X

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