Conductance quantization suppression in the quantum Hall regime
Caridad, José M. (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Power, Stephen R. (Institut Català de Nanociència i Nanotecnologia)
Lotz, Mikkel R. (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Shylau, Artsem A. (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Thomsen, Joachim D. (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Gammelgaard, Lene (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Booth, Timothy J. (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Jauho, Antti-Pekka (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)
Bøggild, Peter (Danmarks Tekniske Universitet. Center for Nanostructured Graphene)

Date:	2018
Abstract:	Conductance quantization is the quintessential feature of electronic transport in non-interacting mesoscopic systems. This phenomenon is observed in quasi one-dimensional conductors at zero magnetic field B, and the formation of edge states at finite magnetic fields results in wider conductance plateaus within the quantum Hall regime. Electrostatic interactions can change this picture qualitatively. At finite B, screening mechanisms in narrow, gated ballistic conductors are predicted to give rise to an increase in conductance and a suppression of quantization due to the appearance of additional conduction channels. Despite being a universal effect, this regime has proven experimentally elusive because of difficulties in realizing one-dimensional systems with sufficiently hard-walled, disorder-free confinement. Here, we experimentally demonstrate the suppression of conductance quantization within the quantum Hall regime for graphene nanoconstrictions with low edge roughness. Our findings may have profound impact on fundamental studies of quantum transport in finite-size, two-dimensional crystals with low disorder.
Grants:	European Commission 6040007 European Commission 696656 European Commission 665919 Ministerio de Economía y Competitividad SEV-2013-0295
Note:	Altres ajuts: CERCA Programme/Generalitat de Catalunya
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Nature communications, Vol. 9 (February 2018) , art. 659, ISSN 2041-1723

DOI: 10.1038/s41467-018-03064-8
PMID: 29440635

6 p, 1.3 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles