Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-02-02
Phys. Rev. E 75, 036401 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
slightly modified and shortened paper to appear in Physical Review E; contains more detailed presentation of theory (appendice
Scientific paper
10.1103/PhysRevE.75.036401
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 bi-excitons 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 [Phys. Rev. Lett. {\bf 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.
Bonitz Michael
Fehske Holger
Filinov Vladimir S.
Fortov Vladimir E.
Levashov Pavel
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