Programme

P.24 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Two dimensional Semi-Parabolic Plus Semi-Inverse Squared Quantum Well: Theoretical study of the oscillation in the quantum Ettingshausen effect at low temperature under the influence of intense electromagnetic waves.

Nguyen Thi Nguyet Anh (1), Nguyen Dinh Nam (1), Pham Tien Thanh (1), Nguyen Quang Son (2), Nguyen Thu Huong (2), Nguyen Quang Bau (1)

(1) Department of Theoretical Physics, Faculty of Physics, VNU University of Science, No. 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam. (2) Academy of Air Defence and Air Force, Kim Son, Son Tay, Ha Noi, Viet Nam.

The quantum Ettingshausen effect in a Semi-Parabolic Plus Semi-Inverse Squared Quantum Well (SPSSQW) under the influence of intense electromagnetic waves (EMWs) is theoretically investigated using the quantum kinetic equation approach. In this study, we focus on the regime of low temperatures where electron–acoustic phonon scattering dominates the transport processes. The analytical expressions for the Ettingshausen coefficient (EC) are derived, elucidating its dependence on the key physical parameters such as the magnetic field (B), the temperature (T), the intense electromagnetic wave (EMW) frequency, and the SPSSQW confinement frequency. The numerical results reveal that the EC exhibits pronounced quantum oscillations as a function of the magnetic field, characteristic of Shubnikov–de Haas-type behavior, with the oscillation amplitude decreasing rapidly at the elevated temperatures. Moreover, under the intense EMW irradiation, the resonance peaks emerge in the EC due to the magneto–phonon resonance, and the positions of these peaks can be quantitatively determined from the magneto–phonon resonance condition. Notably, the resonance peak positions remain unchanged with variations in temperature, but display a shift toward the higher frequencies as the magnetic field strength, the intense EMW frequency, and the confinement frequency of the quantum well increase. In addition, the EC is strongly suppressed with increasing temperature, consistent with the thermal broadening of the electron distribution. These findings provide the comprehensive insights into the quantum Ettingshausen effect with the electron-acoustic phonon scattering, and the intense EMW’s effects on the magneto-thermoelectric properties of low-dimensional semiconductor systems.

Presenter: Nguyen Dinh Nam