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Equilibration of quantum hall edge states and its conductance fluctuations in graphene p-n junctions

Kumar, Chandan and Kuiri, Manabendra and Das, Anindya (2018) Equilibration of quantum hall edge states and its conductance fluctuations in graphene p-n junctions. In: SOLID STATE COMMUNICATIONS, 270 . pp. 38-44.

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Official URL: http://dx.doi.org/10.1016/j.ssc.2017.11.008

Abstract

We report an observation of conductance fluctuations (CFs) in the bipolar regime of quantum hall (QH) plateaus in graphene (p-n-p/n-p-n) devices. The CFs in the bipolar regime are shown to decrease with increasing bias and temperature. At high temperature (above 7 K) the CFs vanishes completely and the flat quantized plateaus are recovered in the bipolar regime. The values of QH plateaus are in theoretical agreement based on full equilibration of chiral channels at the p-n junction. The amplitude of CFs for different filling factors follows a trend predicted by the random matrix theory. Although, there are mismatch in the values of CFs between the experiment and theory but at higher filling factors the experimental values become closer to the theoretical prediction. The suppression of CFs and its dependence has been understood in terms of time dependent disorders present at the p-n junctions.

Item Type: Journal Article
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Additional Information: Copy right for the article belong to PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 22 Mar 2018 13:57
Last Modified: 22 Mar 2018 13:57
URI: http://eprints.iisc.ernet.in/id/eprint/59255

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