The FIR-absorption of short period quantum wires and the transition from one to two dimensions

TL;DR

This paper studies the FIR-absorption properties of short period quantum wires under magnetic fields, analyzing how their electronic structure and Coulomb interactions influence magnetoplasmon modes during the transition from one to two dimensions.

Contribution

It provides a self-consistent analysis of Coulomb interactions and the effects of metal gate gratings on FIR-absorption in quantum wires during dimensional transition.

Findings

Absorption correlates with electronic bandstructure in narrow, weakly modulated wires.

Magnetoplasmon modes split into Bernstein modes in the nonlocal region.

Transition from narrow to broad wires affects the absorption spectra.

Abstract

We investigate the FIR-absorption of short period parallel quantum wires in a perpendicular quantizing magnetic field. The external time-dependent electric field is linearly polarized along the wire modulation. The mutual Coulomb interaction of the electrons is treated self-consistently in the ground state and in the absorption calculation within the Hartree approximation. We consider the effects of a metal gate grating coupler, with the same or with a different period as the wire modulation, on the absorption. The evolution of the magnetoplasmon in the nonlocal region where it is split into several Bernstein modes is discussed in the transition from: narrow to broad wires, and isolated to overlapping wires. We show that in the case of narrow and not strongly modulated wires the absorption can be directly correlated with the underlying electronic bandstructure.