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Valley Subband Splitting in Bilayer Graphene Quantum Point Contacts

Kraft, R. and Krainov, I. V. and Gall, V. and Dmitriev, A. P. and Krupke, R. and Gornyi, I. V. and Danneau, R. (2018):
Valley Subband Splitting in Bilayer Graphene Quantum Point Contacts.
In: Physical Review Letters, 121 (25), p. 257703. American Physical Society, ISSN 0031-9007,
DOI: 10.1103/PhysRevLett.121.257703,
[Article]

Abstract

We report a study of one-dimensional subband splitting in a bilayer graphene quantum point contact in which quantized conductance in steps of 4e2/h is clearly defined down to the lowest subband. While our source-drain bias spectroscopy measurements reveal an unconventional confinement, we observe a full lifting of the valley degeneracy at high magnetic fields perpendicular to the bilayer graphene plane for the first two lowest subbands where confinement and Coulomb interactions are the strongest and a peculiar merging or mixing of K and K′ valleys from two nonadjacent subbands with indices (N,N+2), which are well described by our semiphenomenological model.

Item Type: Article
Erschienen: 2018
Creators: Kraft, R. and Krainov, I. V. and Gall, V. and Dmitriev, A. P. and Krupke, R. and Gornyi, I. V. and Danneau, R.
Title: Valley Subband Splitting in Bilayer Graphene Quantum Point Contacts
Language: English
Abstract:

We report a study of one-dimensional subband splitting in a bilayer graphene quantum point contact in which quantized conductance in steps of 4e2/h is clearly defined down to the lowest subband. While our source-drain bias spectroscopy measurements reveal an unconventional confinement, we observe a full lifting of the valley degeneracy at high magnetic fields perpendicular to the bilayer graphene plane for the first two lowest subbands where confinement and Coulomb interactions are the strongest and a peculiar merging or mixing of K and K′ valleys from two nonadjacent subbands with indices (N,N+2), which are well described by our semiphenomenological model.

Journal or Publication Title: Physical Review Letters
Journal volume: 121
Number: 25
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
Date Deposited: 20 Nov 2020 12:06
DOI: 10.1103/PhysRevLett.121.257703
Official URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.12...
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