Temperature dependence of propagation and damping of nonresonant edge magnetoplasmons for electrons on liquid helium

Very low frequency edge magnetoplasmons (EMP's) for electrons on liquid helium are investigated in the nonresonant regime from current-voltage phase shift measurements for temperatures of 1.57 K and 1.93 K. At these temperatures the mobilities, and therefore the zero field phase shifts, differ by about a factor of three. The phase shift in the EMP regime is the same within 10 %. This confirms the theoretically predicted temperature independence of the EMP dispersion