Possible superconductivity in multi-layer-graphene by application of a gate voltage

2012/02/15 by A. Ballestar, P. Esquinazi, Ballestar, A. +11
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.1202.3327

21 pages, 8 figures, will be published in Carbon (in press, 2014)

arxiv created 2014/02/03 · arxiv updated 2014/02/04

Abstract

The carrier density in tens of nanometers thick graphite samples (multi-layer-graphene, MLG) has been modified by applying a gate voltage (V_g) perpendicular to the graphene planes. Surface potential microscopy shows inhomogeneities in the carrier density (n) in the sample near surface region and under different values of V_g at room temperature. Transport measurements on different MLG samples reveal that under a large enough applied electric field these regions undergo a superconducting-like transition at T \lesssim 17 K. A magnetic field applied parallel or normal to the graphene layers suppresses the transition without changing appreciably the transition temperature.

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