Shubnikov-de Haas oscillations of a single layer graphene under dc current bias

TL;DR

This study investigates how dc current bias affects Shubnikov-de Haas oscillations in single-layer graphene, revealing damping due to electron heating and a novel phase inversion phenomenon linked to bias current and magnetic field.

Contribution

It reports the first observation of phase inversion of SdH oscillations in graphene under dc bias and explains these effects quantitatively with a generalized SdH formula.

Findings

Bias current causes damping of SdH oscillations due to electron heating.

A phase inversion of SdH oscillations occurs with increasing dc bias.

The bias current at inversion onset depends linearly on magnetic field.

Abstract

Shubnikov-de Haas (SdH) oscillations under a dc current bias are experimentally studied on a Hall bar sample of single layer graphene. In dc resistance, the bias current shows the common damping effect on the SdH oscillations and the effect can be well accounted for by an elevated electron temperature that is found to be linearly dependent on the current bias. In differential resistance, a novel phase inversion of the SdH oscillations has been observed with increasing dc bias, namely we observe the oscillation maxima develop into minima and vice versa. Moreover, it is found that the onset biasing current, at which a SdH extremum is about to invert, is linearly dependent on the magnetic field of the SdH extrema. These observations are quantitatively explained with the help of a general SdH formula.