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Emilio Méndez Pérez
Emilio Méndez Pérez (born 22 May 1949) is a Spanish physicist. His research has focused on the study of the optical and electronic properties of semiconductor nanomaterials. Particularly notable are his discoveries on the effects of an electric field on the electronic properties of quantum wells and superlattices, especially the experimental demonstration of the so-called "Stark effect" and the so-called " Wannier–Stark ladder". In 1998, he was awarded the Prince of Asturias Awards The Princess of Asturias Awards (, ), formerly the Prince of Asturias Awards from 1981 to 2014 (), are a series of annual prizes awarded in Spain by the Princess of Asturias Foundation (previously the Prince of Asturias Foundation) to individuals ... for Technical and Scientific Research along Pedro Miguel Echenique Landiríbar. References Living people Spanish physicists People from Lleida Complutense University of Madrid alumni Massachusetts Institute of Technology alumni 1949 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lérida
Lleida (, ; ; ''#Name, see below'') is a city in the west of Catalonia, Spain. It is the capital and largest town in Segrià, Segrià county, the Ponent, Ponent region and the province of Lleida. Geographically, it is located in the Catalan Central Depression. It had 140,797 inhabitants . Lleida is one of the oldest towns in Catalonia, with recorded settlements dating back to the Bronze Age period. Until the Hispania, Roman conquest of the Iberian Peninsula, the area served as a settlement for an Iberian people, the Ilergetes. The town became a municipality, named Ilerda, under the reign of Augustus. It was ruled by Muslims from the 8th century until Siege of Lleida (1149), reconquered in 1149. In 1297, the University of Lleida was founded, becoming the third oldest in the whole of Spain. During the following centuries, the town was damaged by several wars such as the Reapers' War in the 17th century and the Spanish Civil War in the 20th century. Since then, the city has been in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nanomaterials
Nanomaterials describe, in principle, chemical substances or materials of which a single unit is sized (in at least one dimension) between 1 and 100 nm (the usual definition of nanoscale). Nanomaterials research takes a materials science-based approach to nanotechnology, leveraging advances in materials metrology and synthesis which have been developed in support of microfabrication research. Materials with structure at the nanoscale often have unique optical, electronic, thermo-physical or mechanical properties. Nanomaterials are slowly becoming commercialized and beginning to emerge as commodities. Definition In ISO/TS 80004, ''nanomaterial'' is defined as the "material with any external dimension in the nanoscale or having internal structure or surface structure in the nanoscale", with ''nanoscale'' defined as the "length range approximately from 1 nm to 100 nm". This includes both ''nano-objects'', which are discrete pieces of material, and ''nanostructu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantum Well
A quantum well is a potential well with only discrete energy values. The classic model used to demonstrate a quantum well is to confine particles, which were initially free to move in three dimensions, to two dimensions, by forcing them to occupy a planar region. The effects of quantum confinement take place when the quantum well thickness becomes comparable to the de Broglie wavelength of the carriers (generally electrons and electron hole, holes), leading to energy levels called "energy subbands", i.e., the carriers can only have discrete energy values. The concept of quantum well was proposed in 1963 independently by Herbert Kroemer and by Zhores Alferov and R.F. Kazarinov.Zh. I. Alferov and R.F. Kazarinov, Authors Certificate 28448 (U.S.S.R) 1963. History The semiconductor quantum well was developed in 1970 by Leo Esaki, Esaki and Raphael Tsu, Tsu, who also invented synthetic superlattices. They suggested that a Heterojunction, heterostructure made up of alternating thin l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stark Effect
The Stark effect is the shifting and splitting of spectral lines of atoms and molecules due to the presence of an external electric field. It is the electric-field analogue of the Zeeman effect, where a spectral line is split into several components due to the presence of the magnetic field. Although initially coined for the static case, it is also used in the wider context to describe the effect of time-dependent electric fields. In particular, the Stark effect is responsible for the pressure broadening (Stark broadening) of spectral lines by charged particles in plasmas. For most spectral lines, the Stark effect is either linear (proportional to the applied electric field) or quadratic with a high accuracy. The Stark effect can be observed both for emission and absorption lines. The latter is sometimes called the inverse Stark effect, but this term is no longer used in the modern literature. History The effect is named after the German physicist Johannes Stark, who discov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superlattice
A superlattice is a periodic structure of layers of two (or more) materials. Typically, the thickness of one layer is several nanometers. It can also refer to a lower-dimensional structure such as an array of quantum dots or quantum wells. Discovery Superlattices were discovered early in 1925 by Johansson and Linde after the studies on gold–copper and palladium–copper systems through their special X-ray diffraction patterns. Further experimental observations and theoretical modifications on the field were done by Bradley and Jay, Gorsky, Borelius, Dehlinger and Graf, Bragg and Williams and Bethe. Theories were based on the transition of arrangement of atoms in crystal lattices from disordered state to an ordered state. Mechanical properties J.S. Koehler theoretically predicted that by using alternate (nano-)layers of materials with high and low elastic constants, shearing resistance is improved by up to 100 times as the Frank–Read Source, Frank–Read source of dislo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Complutense University Of Madrid
The Complutense University of Madrid (, UCM; ) is a public research university located in Madrid. Founded in Alcalá in 1293 (before relocating to Madrid in 1836), it is one of the oldest operating universities in the world, and one of Spain's most prestigious institutions of higher learning. It is located on a sprawling campus that occupies the entirety of the Ciudad Universitaria district of Madrid, with annexes in the district of Somosaguas in the neighboring city of Pozuelo de Alarcón. It is named after the ancient Roman settlement of Complutum, now an archeological site in Alcalá de Henares, just east of Madrid. It enrolls over 86,000 students, making it the eighth largest non-distance European university by enrollment. By Royal Decree of 1857, the Central University was the first and only institution in Spain authorized to grant doctorate degrees throughout the Spanish Empire. In 1909, the Central University became one of the first universities in the world to grant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Massachusetts Institute Of Technology
The Massachusetts Institute of Technology (MIT) is a Private university, private research university in Cambridge, Massachusetts, United States. Established in 1861, MIT has played a significant role in the development of many areas of modern technology and science. In response to the increasing Technological and industrial history of the United States, industrialization of the United States, William Barton Rogers organized a school in Boston to create "useful knowledge." Initially funded by a land-grant universities, federal land grant, the institute adopted a Polytechnic, polytechnic model that stressed laboratory instruction in applied science and engineering. MIT moved from Boston to Cambridge in 1916 and grew rapidly through collaboration with private industry, military branches, and new federal basic research agencies, the formation of which was influenced by MIT faculty like Vannevar Bush. In the late twentieth century, MIT became a leading center for research in compu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantum Well
A quantum well is a potential well with only discrete energy values. The classic model used to demonstrate a quantum well is to confine particles, which were initially free to move in three dimensions, to two dimensions, by forcing them to occupy a planar region. The effects of quantum confinement take place when the quantum well thickness becomes comparable to the de Broglie wavelength of the carriers (generally electrons and electron hole, holes), leading to energy levels called "energy subbands", i.e., the carriers can only have discrete energy values. The concept of quantum well was proposed in 1963 independently by Herbert Kroemer and by Zhores Alferov and R.F. Kazarinov.Zh. I. Alferov and R.F. Kazarinov, Authors Certificate 28448 (U.S.S.R) 1963. History The semiconductor quantum well was developed in 1970 by Leo Esaki, Esaki and Raphael Tsu, Tsu, who also invented synthetic superlattices. They suggested that a Heterojunction, heterostructure made up of alternating thin l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superlattice
A superlattice is a periodic structure of layers of two (or more) materials. Typically, the thickness of one layer is several nanometers. It can also refer to a lower-dimensional structure such as an array of quantum dots or quantum wells. Discovery Superlattices were discovered early in 1925 by Johansson and Linde after the studies on gold–copper and palladium–copper systems through their special X-ray diffraction patterns. Further experimental observations and theoretical modifications on the field were done by Bradley and Jay, Gorsky, Borelius, Dehlinger and Graf, Bragg and Williams and Bethe. Theories were based on the transition of arrangement of atoms in crystal lattices from disordered state to an ordered state. Mechanical properties J.S. Koehler theoretically predicted that by using alternate (nano-)layers of materials with high and low elastic constants, shearing resistance is improved by up to 100 times as the Frank–Read Source, Frank–Read source of dislo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prince Of Asturias Awards
The Princess of Asturias Awards (, ), formerly the Prince of Asturias Awards from 1981 to 2014 (), are a series of annual prizes awarded in Spain by the Princess of Asturias Foundation (previously the Prince of Asturias Foundation) to individuals, entities or organizations from around the world who make notable achievements in the sciences, humanities, and public affairs. The awards are presented every October in a solemn ceremony at in Oviedo, the capital of the Asturias, Principality of Asturias, and are presented by the Princess of Asturias. Each recipient present at the ceremony receives a diploma, a sculpture expressly created for the awards by Spanish sculptor Joan Miró and a Award pin, pin with the emblem of the Foundation. There is also a monetary prize of €50,000 for each category; this amount is shared if the category has more than one recipient. They were declared of "exceptional contribution to the cultural heritage of Humanity" by UNESCO in 2004. Background Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pedro Miguel Etxenike
Pedro Miguel Etxenike Landiribar, also known as Pedro Miguel Echenique (born 8 June 1950, Isaba, Navarre), is a Basque theoretical solid-state physicist, Professor of Condensed Matter Physics at the University of the Basque Country (UPV/EHU), and former minister of the Basque Autonomous Community. Early life and education Etxenike was the son of a medical doctor, Pedro Etxenike, and a teacher, Felisa Landiribar. Growing up with one brother and one sister in a small navarrese village (with about 800 inhabitants at the time) he later attended a Capuchin boarding school He attended the University of Navarre and graduated in Physics in 1972, receiving the Special Degree Prize and End-of-Studies Award. In 1973, he began his studies at the University of Cambridge with a March stipend. In 1976, he obtained his Ph.D. (with a thesis directed by John Pendry) and, in 1977, he received a Doctorate in Physics from the Autonomous University of Barcelona, for which he received the Specia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Living People
Purpose: Because living persons may suffer personal harm from inappropriate information, we should watch their articles carefully. By adding an article to this category, it marks them with a notice about sources whenever someone tries to edit them, to remind them of WP:BLP (biographies of living persons) policy that these articles must maintain a neutral point of view, maintain factual accuracy, and be properly sourced. Recent changes to these articles are listed on Special:RecentChangesLinked/Living people. Organization: This category should not be sub-categorized. Entries are generally sorted by family name In many societies, a surname, family name, or last name is the mostly hereditary portion of one's personal name that indicates one's family. It is typically combined with a given name to form the full name of a person, although several give .... Maintenance: Individuals of advanced age (over 90), for whom there has been no new documentation in the last ten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
