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




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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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