Magnetoplasmon excitations in an array of periodically modulated quantum wires

摘要

Motivated by the recent experiment of Hochgraefe et al., we have investigatedthe magnetoplasmon excitations in a periodic array of quantum wires with aperiodic modulation along the wire direction. The equilibrium and dynamicproperties of the system are treated self-consistently within theThomas-Fermi-Dirac-von Weizsaecker approximation. A calculation of thedynamical response of the system to a far-infrared radiation field reveals aresonant anticrossing between the Kohn mode and a finite-wavevectorlongitudinal excitation which is induced by the density modulation along thewires. Our theoretical calculations are found to be in excellent agreement withexperiment.