High-frequency transport of microchannel-confined electrons on helium

Transport studies of the two-dimensional electron system trapped at the surface of liquid helium are typically carried out at relatively low driving field frequencies, where the electron system can be represented by simple lumped circuit elements. Here we present a study of the electron transport in a hybrid microchannel device under high-frequency f = 1-20 MHz driving fields. In this device the electron system on the helium surface is capacitively coupled to source and drain electron reservoir electrodes and transported through a narrow microchannel connecting the reservoirs. The analysis of the data is carried out in the framework of transmission line theory and reveals resonant behavior of the electron fluid associated with its wave-like transport nature. We discuss the possibility of these phenomena potentially arising from the inertial response of the electron system.