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Marginally Self-Averaging One-Dimensional Localization in Bilayer Graphene

Aamir, Md Ali and Karnatak, Paritosh and Jayaraman, Aditya and Sai, T Phanindra and Ramakrishnan, T and Sensarma, Rajdeep and Ghosh, Arindam (2018) Marginally Self-Averaging One-Dimensional Localization in Bilayer Graphene. In: PHYSICAL REVIEW LETTERS, 121 (13).

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.121.136806


The combination of a field-tunable band gap, topological edge states, and valleys in the band structure makes insulating bilayer graphene a unique localized system, where the scaling laws of dimensionless conductance g remain largely unexplored. Here we show that the relative fluctuations in ln g with the varying chemical potential, in strongly insulating bilayer graphene (BLG), decay nearly logarithmically for a channel length up to L/xi approximate to 20, where xi is the localization length. This ``marginal'' self-averaging, and the corresponding dependence of < ln g > on L, suggests that transport in strongly gapped BLG occurs along strictly one-dimensional channels, where xi approximate to 0.5 +/- 0.1 mu m was found to be much longer than that expected from the bulk band gap. Our experiment reveals a nontrivial localization mechanism in gapped BLG, governed by transport along robust edge modes.

Item Type: Journal Article
Additional Information: Copy right for this article belong to AMER PHYSICAL SOC
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 16 Oct 2018 15:01
Last Modified: 16 Oct 2018 15:01
URI: http://eprints.iisc.ac.in/id/eprint/60894

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