Vol. 32 No. 3 (2022)
Papers

Excitonic Susceptibility Function in Semimetal/semiconductor Materials: Formation of the Excitonic Condensate State

Thi Hong Hai Do
Hanoi University of Mining and Geology, Duc Thang, Bac Tu Liem, Hanoi, Vietnam
Thi Hau Nguyen
Hanoi University of Mining and Geology, Duc Thang, Bac Tu Liem, Hanoi, Vietnam

Published 30-05-2022

How to Cite

Do, T. H. H., & Nguyen, T. H. (2022). Excitonic Susceptibility Function in Semimetal/semiconductor Materials: Formation of the Excitonic Condensate State. Communications in Physics, 32(3), 295. https://doi.org/10.15625/0868-3166/16748

Abstract

The condensate state of excitons in semimetal/semiconductor materials has been considered by analyzing the excitonic susceptibility function in the 2D extended Falicov-Kimbol model including electron-phonon interaction. The excitonic susceptibility in the system has calculated by using the Hartree-Fock approximation. From numerical results, we have set up phase diagrams of
the excitonic condensate state. Phase diagrams confirm that the electron-phonon coupling plays an important role as well as the Coulomb attraction does in establishing the excitonic condensed phase at low temperature. The condensate phase of excitons is found within a limited range of the Coulomb attraction as the electron-phonon coupling is large enough. Depending on the
electron-phonon coupling and the Coulomb attraction, the BCS-BEC crossover of the excitonic condensation phase has also been pointed out.

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