An approximate microscopic model is proposed to explain the electric signal $▵U\approx k_B▵T/2e$ observed by A. S. Rybalko [Fiz. Nizk. Temp. 30, 1321 (2004)] in He II in experiments with standing half-waves of second sound. The model is based on the idea, due to Gutlyanskii, of one-directional polarization of ${}^4\mathrm{He}$ atoms located at the electrode surface. The calculated parameters of the electric signal are in approximate agreement with the experimental ones. It is also predicted that a standing half-wave of first sound should induce a variable signal with amplitude $▵U~▵p/\left|e\right|n~3\times {10}^{-5}▵p\text{V}/\text{atm}$ at the electrode.

• Received 10 October 2010

DOI:https://doi.org/10.1103/PhysRevB.83.094512