Fluctuational-field-induced narrowing of the quantum cyclotron resonance from two-dimensional electrons on the surface of superfluid helium

Abstract

We have observed strong narrowing of the quantum cyclotron resonance (CR) linewidth of surface electrons on liquid helium, which is caused by the many-electron fluctuational field. In the reported experiment, the amplitude of the internal fluctuational electric field was varied by changing the electron density (linear CR regime) and electron temperature (nonlinear CR regime). The observed Coulombic effect is interpreted as an inelastic suppression of the collision broadening of Landau levels due to the ultra-fast drift velocities of the electron orbits in the strong fluctuational many-electron field.