Programme

P.13 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

THE NERNST COEFFICIENT IN SEMI-PARABOLIC PLUS SEMI-INVERSE SQUARED QUANTUM WELLS UNDER THE INFLUENCE OF INTENSE ELECTROMAGNETIC WAVES

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

(1) Faculty of Basic Science, Air Defence-Air Force Academy, Kim Son, Son Tay, Hanoi, Vietnam; (2) Department of Theoretical Physics, Faculty of Physics, VNU University of Science, Vietnam National University, Hanoi. Address: No 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam

This work provides new insight into the quantum Nernst effect (QNE) by establishing a quantitative connection between resonance peak positions and the magneto-phonon-photon resonance condition in semi-parabolic plus semi-inverse squared quantum wells (SPSSQWs) under intense electromagnetic wave (EMW) radiation. In contrast to previous theoretical studies focused on other low-dimensional systems, our results demonstrate the emergence of multi-mode quantum resonances that are characteristic of asymmetric SPSSQW confinement, as well as a refined framework for the precise tuning of magneto-thermoelectric responses in engineered low-dimensional systems. To achieve these results, we use quantum kinetic theory to derive analytic expressions for the Nernst coefficient by calculating the electric conductivity tensors and thermodynamic tensors. Our numerical results for GaAs/AlGaAs SPSSQWs reveal pronounced features in the Nernst coefficient as functions of the EMW frequency, magnetic field strength, confinement frequency, and temperature. Notably, the precise positions of these resonance peaks are calculated by using the magneto-phonon-photon resonance condition. We also observe the shifting towards the higher frequency and amplitude enhancements of the resonance peaks with increasing magnetic field, confinement frequency, EMW frequency, while changes in temperature do not affect the positions of the resonance peaks. Our results establish a robust theoretical foundation for the controlled manipulation of thermomagnetic transport in SPSSQWs, paving the way for future experimental validation and device applications.

Presenter: Nguyen Quang Son