Semiconductor structures, low-dimensional systems, quantum phenomena

Terahertz Few-particle Magnetoabsorption in Asymmetric Ellipsoidal Ge/Si QD

A. A. Nahapetyan^a, M. А. Mkrtchyan^ab, M. Ya. Vinnichenko^c, D. A. Firsov^c, H. A. Sarkisyan<sup>a

a</sup> Institute of Applied Problems of Physics National Academy of Sciences of the Republic of Armenia, 0014 Yerevan, Armenia
^b Russian-Armenian University, 0051 Yerevan, Armenia
^c Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia

Abstract: The behavior of a heavy-hole gas in a strongly oblate, asymmetric ellipsoidal Ge/Si quantum dot under an axial homogeneous magnetic field has been investigated. Due to the specific geometry of the quantum dot, the interaction between holes is considered two-dimensional. The realization of the generalized Kohn theorem in such a system under the influence of the incident long-wave radiation has been shown in the dipole approximation. The exact energy spectrum has been obtained for the case of a strongly oblate ellipsoidal quantum dots with a circular cross-section, using the Johnson and Payne model of a circular two-dimensional parabolic well. A detailed analysis of the energy spectrum is presented.

Keywords: еllipsoidal quantum dot, magnetic field, Moshinsky model, generalized Kohn theorem, terahertz optical transitions, Johnson and Payne model.

Received: 20.10.2025
Revised: 21.11.2025
Accepted: 12.12.2025

Language: English