Programme

P.7 -- Poster, VCTP-47

Date: Tuesday, 2 August 2022

Time: 08:30 - 10:00

Theoretical study of photostimulated Nernst effect in cylindrical quantum wires

Tang Thi Dien (1), Nguyen Thu Huong (2), Nguyen Thi Nguyet Anh (1), 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)Faculty of Basic Science, Air Defense-Air Force Academy, Kim Son commune, Son Tay town, Hanoi, Vietnam

The photostimulated Nernst effect in cylindrical quantum wires under the influence of confined optical phonons (confined OP) is studied by using the quantum kinetic equation method. We presume that the confined electrons-confined OP scattering is essential. The analytical expression for the kinetic tensors and the Nernst coefficient (NC) have been determined, they are functions of external fields, the temperature of the system, the radius of the wires, especially the quantum number m1 and m2 describe confined OP. The theoretical results are numerically estimated and discussed for the cylindrical quantum wires (CQW) of GaAs/AlGaAs. The inter-subband magnetophonon resonance condition was demonstrated when analyzing the dependence NC on the photon energy. The confined OP has increased the NC about 2.3 times compared with the unconfined OP case. This change was also found when investigating the effect of the magnetic field on the NC. Besides, at the high temperature, the NC which increased considerably was achieved when examining the dependence of NC on the temperature. All numerical results indicated that the NC was affected by the confined OP and the presence of EMW. In addition, these results obtained in this work are different in comparison with the bulk semiconductors case.

Presenter: Nguyen Thu Huong