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Title: Universal conductance fluctuations as a direct probe to valley coherence and universality class of disordered graphene

Abstract

We demonstrate that the universal conductance fluctuations (UCF) can be used as a direct probe to study the valley quantum states in disordered graphene. The UCF magnitude in graphene is suppressed by a factor of four at high carrier densities where the short-range disorder essentially breaks the valley degeneracy of the K and K' valleys, leading to a density dependent crossover of symmetry class from symplectic near the Dirac point to orthogonal at high densities.

Authors:
; ;  [1]
  1. Department of Physics, Indian Institute of Science, Bangalore 560 012 (India)
Publication Date:
OSTI Identifier:
22261770
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1566; Journal Issue: 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; DENSITY; FLUCTUATIONS; GRAPHENE; QUANTUM STATES

Citation Formats

Kochat, Vidya, Pal, Atindra Nath, and Ghosh, Arindam. Universal conductance fluctuations as a direct probe to valley coherence and universality class of disordered graphene. United States: N. p., 2013. Web. doi:10.1063/1.4848335.
Kochat, Vidya, Pal, Atindra Nath, & Ghosh, Arindam. Universal conductance fluctuations as a direct probe to valley coherence and universality class of disordered graphene. United States. https://doi.org/10.1063/1.4848335
Kochat, Vidya, Pal, Atindra Nath, and Ghosh, Arindam. Wed . "Universal conductance fluctuations as a direct probe to valley coherence and universality class of disordered graphene". United States. https://doi.org/10.1063/1.4848335.
@article{osti_22261770,
title = {Universal conductance fluctuations as a direct probe to valley coherence and universality class of disordered graphene},
author = {Kochat, Vidya and Pal, Atindra Nath and Ghosh, Arindam},
abstractNote = {We demonstrate that the universal conductance fluctuations (UCF) can be used as a direct probe to study the valley quantum states in disordered graphene. The UCF magnitude in graphene is suppressed by a factor of four at high carrier densities where the short-range disorder essentially breaks the valley degeneracy of the K and K' valleys, leading to a density dependent crossover of symmetry class from symplectic near the Dirac point to orthogonal at high densities.},
doi = {10.1063/1.4848335},
url = {https://www.osti.gov/biblio/22261770}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1566,
place = {United States},
year = {2013},
month = {12}
}