Dependence of the amplitude of magnetoquantum oscillations of the metallic point-contact resistance on the bias voltage

TL;DR

This paper investigates how magnetoquantum oscillation amplitudes in metallic point-contact resistance depend on bias voltage, revealing nonmonotonic behavior linked to electron-phonon interactions and Fermi-liquid effects.

Contribution

It demonstrates the dependence of oscillation amplitude on bias voltage and relates it to electron-phonon interactions and nonequilibrium effects in metallic point contacts.

Findings

Oscillation amplitude increases with voltage for some contacts.

Amplitude correlates with the EPI spectrum in certain contacts.

Nonmonotonic energy dependence observed in oscillation amplitude.

Abstract

Magnetoquantum oscillations of resistance as functions of the potential difference applied across the contact are studied for metallic point contacts made of $Al$ and $Be$. The amplitude of resistance oscillations in a magnetic field increases with voltage and is identical to the EPI spectrum of the point contact for one group of contacts, and with the bias voltage across the contact for another. The increase in the oscillation amplitude as well as its decrease has a nonmonotonic dependence on energy. The scattering of electrons by nonequilibrium phonons and the Fermi-liquid effects in the nonequilibrium electron system are considered as the possible reasons behind the observed effects.