Magnetoplasmon excitations in an array of periodically modulated quantum wires

Motivated by the recent experiment of Hochgräfe et al., we have investigated the magnetoplasmon excitations in a periodic array of quantum wires with a periodic modulation along the wire direction. The equilibrium and dynamic properties of the system are treated self-consistently within the Thomas–Fermi–Dirac–von Weizsäcker approximation. A calculation of the dynamical response of the system to a far-infrared radiation field reveals a resonant anticrossing between the Kohn mode and a finite-wave-vector longitudinal excitation that is induced by the density modulation along the wires. Our theoretical calculations are found to be in excellent agreement with experiment.