Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 57: Poster IIa
HL 57.8: Poster
Tuesday, March 8, 2005, 16:30–19:00, Poster TU E
Correlation effects in dense mass-asymmetric electron-hole plasmas — •Michael Bonitz1, Vladimir Filinov2, Vladimir Fortov2, Pavel Levashov2, and Holger Fehske3 — 1Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstrasse 15, 24098 Kiel — 2Institute for High Energy Density, Russian Academy of Sciences, Moscow, Russia — 3Institute of Physics, Ernst-Moritz-Arndt-University Greifswald
Insulating excitonic phases in strongly correlated semiconductors, insulator-metal transition and the possibility of exciton Bose condensation are attracting increasing interest, e.g. [1].
A theoretical approach which is particularly well suited to describe these phenomena is the path integral quantum Monte Carlo (PIMC) method. We present simulation results for the excitonic phase diagram of TmSe0.45Te0.55 which was measured in Ref. [1]. In particular, we calculate the fraction of the electron-hole and hole-hole bound states, pair correlation functions, snapshots of the particle positions, internal energy and equation of state of a mass-asymmetric electron-hole plasma. Data for the isotherms T=30-300 K are presented. Density-temperature regions have been found for existence of excitons, bi-excitons and many-particle clusters. The transition to a metallic state is detected [2].
[1] P. Wachter, B. Bucher, and J. Malar, Phys. Rev. B 69, 094502 (2004); [2] V. Filinov, H. Fehske, and M. Bonitz, New J. Phys. (2005)