Interminiband absorption in a quantum ring superlattice in magnetic field with periodic vector potential

Publication date: Available online 18 September 2019Source: Physica E: Low-dimensional Systems and NanostructuresAuthor(s): Vigen Aziz-Aghchegala, Vram Mughnetsyan, Ara Atayan, Albert KirakosyanAbstractThe miniband Aharonov-Bohm oscillations and the interminiband absorption coefficient have been considered theoretically for one-layer superlattices of square and rectangular symmetries, composed of cylindrical quantum rings in the external transverse magnetic field with a periodic vector potential by the lattice constants. The crossings and anticrossings of the energies corresponding to different values of quasimomentum are observed. It is shown that the energy gap between the minibands and the sequence of the energies in each miniband can be tuned by the magnetic field. The interminiband absorption coefficient qualitatively depends on the symmetry of the superlattice, magnetic field induction and the incident light polarization. The obtained results indicate on the possibility to control the electronic and optical characteristics of the devices based on quantum ring superlattices. Keywords: quantum ring superlattice, Aharonov-Bohm oscillations, interminiband absorption.

Source: Physica E: Low dimensional Systems and Nanostructures - September 20, 2019 Category: Nanotechnology Source Type: research