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

Thi Hong Hai Do, Thi Hau Nguyen
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Authors

  • 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

DOI:

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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Published

30-05-2022

How to Cite

[1]
T. H. H. Do and T. H. Nguyen, “Excitonic Susceptibility Function in Semimetal/semiconductor Materials: Formation of the Excitonic Condensate State”, Comm. Phys., vol. 32, no. 3, p. 295, May 2022.

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Papers
Received 22-11-2021
Accepted 13-04-2022
Published 30-05-2022