Damping of edge magnetoplasmons and quantum transport of surface-state electrons on liquid helium

Edge magnetoplasmons on a liquid helium surface have been studied from 90 to 1400 mK and for magnetic fields up to 6.4 T. The magnetoconductivity sigma(zz) is obtained from the damping coefficient. Above 900 mK, the present sigma(xx) result agrees well with the previous result obtained by Dykman et al. [Phys. Rev. Lett. 70 (1993) 3975]. Below 700 mK: sigma(xx) is proportional to 1/root T, where T is temperature, and almost independent of the magnetic field. The temperature dependence agrees well with theory, whereas the magnetic field dependence does not. Nonlinear narrowing of the resonance linewidth is observed.