Programme

P.70 -- Posters, VCTP-50

Date: Thursday, 7 August 2025

Time: 08:30 - 10:00

BCS–BEC crossover of the equilibirum excitonic-polaritonic condensates in the mass imbalance optical microcavities

Thi-Hau Nguyen1,2, Thi-Hong-Hai Do2 and Van-Nham Phan3

1Graduate University of Science and Technology - Vietnam Academy of Science and Technology; 2Department of Physics, Hanoi University of Mining and Geology, Duc Thang, Bac Tu Liem, Hanoi, Vietnam; 3 Institute of Research and Development, Duy Tan University, 3 Quang Trung, Danang, Vietnam.

Electron-hole mass imbalance and Coulomb interaction impacts on the BCS–BEC crossover of the excitonic-polaritonic condensation states in the equilibirum optical semiconducting microcavities are examined. Within the unrestricted Hartree–Fock framework applied to a two-band electronic system incorporating both the electron–hole Coulomb attraction and light–matter coupling on an equal footing, the polaritonic condensate order parameter is selfconsistently solved. The excitonic and photonic susceptibilities evaluated by the random phase approximation specify the phase boundaries of the excitonic-polaritonic-photonic condensate structures. Analyzing the momentum distributions of the electron-hole pair amplitude and photonic density shows us the complex BCS-BEC crossover of the condensation states. The phase diagram indicates significant roles of the Coulomb interaction and mass imbalance on the stabilities of the excitonic-polaritonic condensation states in the equilibrium optical microcavities.

Presenter: Nguyen Thi Hau