RESONANCE AND FINE-STRUCTURE EFFECTS IN THE SPECTRUM OF MAGNETOPLASMONS IN QUANTUM-WELL WIRES

A theory is developed to calculate the dispersion relation of the magn etoplasmons of the quasi-one-dimensional electron gas in the framework of the random-phase approximation in the presence of a quantizing mag netic field. We calculate the optical power absorption and discuss the magnetooptical manifestations of the magnetoplasmons in absorption sp ectra. It is shown that for certain values of the physical parameters, additional intersubband modes exist which have the character of confi ned modes. With these modes it is possible to explain the recent exper imental findings of resonance splitting and fine-structure effects in far-infrared transmission spectroscopy on quantum-well wires.