New experimental approach on charging technique of helium surface over rectangular electrodes at cryogenic temperature

We report results on the charging technique of liquid helium surface over rectangular electrodes and maximum sustainable electron density at temperatures above 1 K. Also, thermally activated escape of two-dimensional electrons from the potential well has been studied as a function of various parameters like electrons density and temperature. Results provide insights into the charging process of the surface-state electrons and their stability parameters over these electrodes with AC capacitive coupling technique