MAGNETOPHONON RESONANCE IN QUANTUM WIRES

Magnetophonon resonance effects in quantum wires are discussed. In a n arrow quantum wire with a parabolic confinement potential, energy spac ing HBAROMEGA, the magnetoconductivity exhibits extrema at resonance N HBARsquare-rootomega(c)2 + OMEGA2 = HBARomega0, where omega(c) = eB/m and N = 1, 2, 3, ... The magnetoconductivity is found to consist of t wo dominant terms, the one sigma(e - ph), due to the scattering of ele ctrons located near the center of the quantum wire by LO phonons resul ting in maxima of the magnetoconductivity at resonance, and the other, sigma(po) due to the disturbance of the skipping motion of electrons near the edge of the quantum wire giving rise to minima in the magneto conductivity. Experiments have been carried out in quantum wires with different structures, and revealed maxima in the magnetoresistance (rh o(xx) = 1/sigma(xx)) in the temperature range 100-200 K, which indicat es the term sigma(po) dominates. Determination of the energy spacing a nd the effective mass is discussed.