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Direct Observation of Valley Hybridization and Universal Symmetry of Graphene with Mesoscopic Conductance Fluctuations

Pal, Atindra Nath and Kochat, Vidya and Ghosh, Arindam (2012) Direct Observation of Valley Hybridization and Universal Symmetry of Graphene with Mesoscopic Conductance Fluctuations. In: PHYSICAL REVIEW LETTERS, 109 (19).

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.109.196601

Abstract

In graphene, the valleys represent spinlike quantities and can act as a physical resource in valley-based electronics to produce novel quantum computation schemes. Here we demonstrate a direct route to tune and read the valley quantum states of disordered graphene by measuring the mesoscopic conductance fluctuations. We show that the conductance fluctuations in graphene at low temperatures are reduced by a factor of 4 when valley triplet states are gapped in the presence of short-range potential scatterers at high carrier densities. We also show that this implies a gate tunable universal symmetry class that outlines a fundamental feature arising from graphene's unique crystal structure.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the American Physical Society
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Francis Jayakanth
Date Deposited: 19 Dec 2012 10:58
Last Modified: 19 Dec 2012 10:58
URI: http://eprints.iisc.ac.in/id/eprint/45548

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