Marginally Self-Averaging One-Dimensional Localization in Bilayer Graphene
| Autor: | T. V. Ramakrishnan, Aditya Jayaraman, Paritosh Karnatak, T. Phanindra Sai, Rajdeep Sensarma, Arindam Ghosh, Ali Aamir |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Self-averaging Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Band gap General Physics and Astronomy Conductance FOS: Physical sciences 02 engineering and technology Edge (geometry) 021001 nanoscience & nanotechnology 01 natural sciences 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Edge states 010306 general physics 0210 nano-technology Bilayer graphene Electronic band structure Dimensionless quantity |
| Zdroj: | Physical review letters. 121(13) |
| ISSN: | 1079-7114 |
| Popis: | The combination of field tunable bandgap, 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 channel length up to L/${\xi}$ ${\approx}$ 20, where ${\xi}$ is the localization length. This 'marginal' self averaging, and the corresponding dependence of on L, suggest that transport in strongly gapped BLG occurs along strictly one-dimensional channels, where ${\xi}$ ${\approx}$ 0.5${\pm}$0.1 ${\mu}$m was found to be much longer than that expected from the bulk bandgap. Our experiment reveals a nontrivial localization mechanism in gapped BLG, governed by transport along robust edge modes. Comment: This document is the Author's version of a submitted work that was subsequently accepted for publication in Physical Review Letters |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|