The possibility of poly-exciton in electron hole systems

2016 Fiscal Year Final Research Report

• Project/Area Number: 26287063
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Japan Advanced Institute of Science and Technology
• Principal Investigator: Maezono Ryo 北陸先端科学技術大学院大学, 先端科学技術研究科, 准教授 (40354146)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ポリ励起子 / 拡散モンテカルロ / 電子相関 / 電子正孔ガス / 間接遷移型半導体 / トリオン

Outline of Final Research Achievements

Phase diagrams of electron-hole systems are investigated by using diffusion Monte Carlo method. The system is modelled by the effective inter-particle interactions with tunable parameters for the Coulombic screenings and the mass ratio between electrons and holes. A phase diagram is evaluated as a function of the screening strength (representing electronic correlation effect) and the mass ratio (quantum dynamics of nuclei). It may describe how much stable when an exciton is bound by a donor impurity in semiconductors. As well as the work on electron-hole models, we worked on real materials, such as layered pnictides, to estimate realistic parameters for the ratio and screening effects. On the investigations, we found the lattice instability through its phonon properties and made an successful explanation of the experimental facts under intensive debates about the origin of the instability.

Free Research Field

多体電子論、量子エレクトロニクス