Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-04-19
Physical Review B 84, 115429 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures, A few references added
Scientific paper
10.1103/PhysRevB.84.115429
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.
Liu Guo-Tao
Lu Linyuan
Ma Liangping
Tan ChangLing
Tan Zhenbing
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