Abstract
It is shown that nonequilibrium filling of an upper surface subband induced by a microwave resonance can be the origin of absolute negative conductivity and zero-resistance states for a two-dimensional electron system on liquid helium in a perpendicular magnetic field. Contrary to a similar effect reported for semiconductor systems, an oscillating sign-changing correction to the dc-magnetoconductivity shows up as a result of quasi-elastic inter-subband scattering that does not involve photons. This analysis explains the remarkable magnetooscillations and zero-resistance states recently observed in electron systems on liquid helium.
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