Development of numerical methods for nonequilibrium many-body states in quantum dot systems

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540316
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: KATO Takeo 東京大学, 物性研究所, 准教授 (80332956)
• Co-Investigator(Kenkyū-buntansha): SAKANO Rui 東京大学, 物性研究所, 助教 (00625022)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: メゾスコピック系・局在 / 近藤効果 / 量子コヒーレンス / 非平衡統計力学 / スピントロニクス

Outline of Final Research Achievements

We discussed time-dependent transport and effect of vertex corrections in quantum dot systems, which are described by an impurity Anderson model. This calculation provides a starting point of theoretical approach to understand photon-assisted transport in interacting electron systems, and gives a foundation for higher-order conserving approximations. We also studied dephasing phenomena in single-electron and single-photon generation, heat transport via a local two-state systems, and relation between spin diffusion length and spin localization length theoretically. Sakano Rui, who is a member of this project, studied multi-orbital Anderson models theoretically in the limit of high bias as well as in the low-temperature Fermi-liquid region.

Free Research Field

物性理論