was a Japanese physicist. Matsubara proposed a method of statistical mechanics related to

Green's function (many-body theory) In many-body theory, the term Green's function (or Green function) is sometimes used interchangeably with correlation function, but refers specifically to correlators of field operators or creation and annihilation operators. The name comes from ...

, by applying quantum field theory techniques to statistical physics. This method, commonly known as Matsubara Green's function technique, introduces the notion of imaginary time, and the reciprocal variable to this imaginary time is known as discrete

Matsubara frequency In thermal quantum field theory, the Matsubara frequency summation (named after Takeo Matsubara) is the summation over discrete imaginary frequencies. It takes the following form :S_\eta = \frac\sum_ g(i\omega_n), where \beta = \hbar / k_ T is t ...

. Matsubara graduated from

Osaka Imperial University , abbreviated as , is a public research university located in Osaka Prefecture, Japan. It is one of Japan's former Imperial Universities and a Designated National University listed as a "Top Type" university in the Top Global University Project. ...

, and worked as full professor in

Hokkaido University , or , is a Japanese national university in Sapporo, Hokkaido. It was the fifth Imperial University in Japan, which were established to be the nation's finest institutions of higher education or research. Hokkaido University is considered ...

, Kyoto University, and

Okayama University of Science is a private university in Okayama, Okayama, Japan, established in 1964. It is predominantly a school of science and engineering. Notable events From 2015–2018, Okayama University of Science's operator, the group Kake Gakuen, applied for ...

. He was the winner of the

Nishina Memorial Prize The is the oldest and most prestigious physics award in Japan. Information Since 1955, the Nishina Memorial Prize has been awarded annually by the Nishina Memorial Foundation. The Foundation was established to commemorate Yoshio Nishina, who w ...

in 1961, and took the directorship of the

Physical Society of Japan The Physical Society of Japan (JPS; 日本物理学会 in Japanese) is the organisation of physicists in Japan. There are about 16,000 members, including university professors, researchers as well as educators, and engineers. The origins of the JP ...

. His work with Yukata Toyozawa on impurity bands in

semiconductor A semiconductor is a material which has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass. Its resistivity falls as its temperature rises; metals behave in the opposite way. ...

s has led to the Matsubara-Toyozawa model that describes the motion of an electron in a random lattice. His research interests were dielectric materials, superconductivity and superfluidity. He wrote various physics textbooks in Japanese.

References

External links

* Kotobank.j

{{DEFAULTSORT:Matsubara, Takeo 1921 births 2014 deaths Japanese physicists People from Osaka Hokkaido University faculty Kyoto University faculty Osaka University alumni Presidents of the Physical Society of Japan