40th National Conference on Theoretical Physics (NCTP-40)
Hội nghị Vật lý lý thuyết toàn quốc lần thứ 40
Đà Lạt, 27-29 July 2015
in association with: 3rd International Workshop on Theoretical and
Computational Physics: Complex Systems and Interdisciplinary Physics

Program

P.30 -- Poster, NCTP-40

Date: Monday, 27 July 2015

Time: 14h00 - 15h30

Temperature dependence of electron-hole pair condensation driven by exciton-phonon interaction

Do Thi Hong Hai (1), Nguyen Thi Giang (2), Nguyen Huu Nha (3), Phan Van Nham (4).

(1) Department of Physics, Hanoi University of Mining and Geology, Duc Thang, Bac Tu Liem, Hanoi; (2) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Hanoi; (3) Department of Physics, HCMC University of Science, 227 Nguyen Van Cu, Ho Chi Minh city; (4) Institute of Research and Development, Duy Tan University, K7/25 Quang Trung, Danang.

A stability of the electron-hole pair condensation at low temperature has been addressed by involving the coupling of exciton to vibrational degrees of freedom in two-dimensional two-band $f-c$ electron system. By mean of the unrestricted Hartree-Fock approximation, we find a formation of the insulating state typifying an excitonic condensate accompanied by a finite lattice distortion if the exciton-phonon coupling is large enough. As functions of temperature both excitonic condensation order parameter and lattice distortion behave in a same way which manifests the continuous transition in analogy to the superconductivity in the BCS theory. Inspecting to the microscopic properties in momentum space we strongly specify the BCS type of the excitonic condensation driven by the exciton-phonon interaction at low temperature.

Presenter: Do Thi Hong Hai


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