THEORY OF MAGNETOOPTICAL ABSORPTION OF THE QUASI-ONE-DIMENSIONAL ELECTRON-GAS

In the framework of the current-response scheme we develop the theory of magneto-optical absorption of the quasi-one-dimensional electron ga s synthesized in semiconductor quantum-well wires. We calculate the no nlocal magnetoconductivity tensor in the random-phase approximation. T he calculations of power absorption are done for normally incident lig ht with electric held vector polarized perpendicular to the wire. It i s shown that the absorption peaks arise at the frequencies of the anti symmetric intersubband magnetoplasmons (collective intersubband resona nces), for both fundamental and additional antisymmetric modes and thu s, only these modes are dipole-active. The strengths of the absorption maxima depend on the magnetic field, and are different for the differ ent modes. In the regions of weak hybridization of collective electron transitions the fundamental modes show a nearly linear increase of th e peak height with increasing magnetic field, while the additional mod es show maximum absorption in a finite range of magnetic field. The ob tained results agree well with the recently observed far-infrared abso rption spectra. (C) 1998 Elsevier Science B.V. All rights reserved.