Correlation effects in partially ionized mass asymmetric electron-hole plasmas.
The effects of strong Coulomb correlations in dense three-dimensional electron-hole plasmas are studied by means of unbiased direct path integral Monte Carlo simulations. The formation and dissociation of bound states, such as excitons and biexcitons, is analyzed and the density-temperature region of their appearance is identified. At high density, the Mott transition to the fully ionized metallic state (electron-hole liquid) is detected. Particular attention is paid to the influence of the hole to electron mass ratio M on the properties of the plasma. Above a critical value of about M=80 formation of a hole Coulomb crystal was recently verified [Bonitz, Phys. Rev. Lett. 95, 235006 (2005)] which is supported by additional results. Results are related to the excitonic phase diagram of intermediate valent Tm[Se,Te], where large values of M have been observed experimentally.
Filinov
V S
VS
Institute for High Energy Density, Russian Academy of Sciences, Izhorskaya 13/19, Moscow 127412, Russia.
Fehske
H
H
Bonitz
M
M
Fortov
V E
VE
Levashov
P
P