Macroscopic quantum theory of quantum condensation in nonequilibrium composite systems

2017 Fiscal Year Final Research Report

• Project/Area Number: 26287087
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Mathematical physics/Fundamental condensed matter physics
• Research Institution: Osaka University
• Principal Investigator: OGAWA Tetsuo 大阪大学, 理学研究科, 教授 (50211123)
• Co-Investigator(Kenkyū-buntansha): 馬場 基彰 大阪大学, 基礎工学研究科, 招へい教員 (30647970) ; 弓削 達郎 静岡大学, 理学部, 助教 (70547380) ; 山口 真 東海大学, 理学部, 講師 (40733895)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: マクロ量子論 / 非平衡 / 量子熱機関

Outline of Final Research Achievements

The purpose of this study is to construct a macroscopic quantum theory for nonequilibrium composite systems. We have obtained results within the theories for both general and concrete systems. The main results are as follows.
(1) Proposed a new picture of the appearance of coherence (polariton) on the exciton lifetime in semiconductors, (2) Discovered a superconducting circuit system in which both the equilibrium phase transition and the nonequilibrium condensation can occur, (3) Constructed a time-dependent theory for BEC-BCS-LASER crossover, (4) Discovered nonequilibrium plateaus in a coupled cavity QED array system, (5) Constructed the method of decomposing the radiation energy into work and heat in cavity QED systems, (6) Discovered a relationship between the quantum feature and computational speedup for the adiabatic quantum computation.

Free Research Field

物性理論