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Tuning Anti-Klein to Klein Tunneling in Bilayer Graphene

Du, Renjun ; Liu, Ming-Hao ; Mohrmann, Jens ; Wu, Fan ; Krupke, Ralph ; Löhneysen, Hilbert von ; Richter, Klaus ; Danneau, Romain (2018):
Tuning Anti-Klein to Klein Tunneling in Bilayer Graphene.
In: Physical Review Letters, 121 (12), p. 127706. American Physical Society, ISSN 0031-9007,
DOI: 10.1103/PhysRevLett.121.127706,
[Article]

Abstract

We show that in gapped bilayer graphene, quasiparticle tunneling and the corresponding Berry phase can be controlled such that they exhibit features of single-layer graphene such as Klein tunneling. The Berry phase is detected by a high-quality Fabry-Pérot interferometer based on bilayer graphene. By raising the Fermi energy of the charge carriers, we find that the Berry phase can be continuously tuned from 2π down to 0.68π in gapped bilayer graphene, in contrast to the constant Berry phase of 2π in pristine bilayer graphene. Particularly, we observe a Berry phase of π, the standard value for single-layer graphene. As the Berry phase decreases, the corresponding transmission probability of charge carriers at normal incidence clearly demonstrates a transition from anti-Klein tunneling to nearly perfect Klein tunneling.

Item Type: Article
Erschienen: 2018
Creators: Du, Renjun ; Liu, Ming-Hao ; Mohrmann, Jens ; Wu, Fan ; Krupke, Ralph ; Löhneysen, Hilbert von ; Richter, Klaus ; Danneau, Romain
Title: Tuning Anti-Klein to Klein Tunneling in Bilayer Graphene
Language: English
Abstract:

We show that in gapped bilayer graphene, quasiparticle tunneling and the corresponding Berry phase can be controlled such that they exhibit features of single-layer graphene such as Klein tunneling. The Berry phase is detected by a high-quality Fabry-Pérot interferometer based on bilayer graphene. By raising the Fermi energy of the charge carriers, we find that the Berry phase can be continuously tuned from 2π down to 0.68π in gapped bilayer graphene, in contrast to the constant Berry phase of 2π in pristine bilayer graphene. Particularly, we observe a Berry phase of π, the standard value for single-layer graphene. As the Berry phase decreases, the corresponding transmission probability of charge carriers at normal incidence clearly demonstrates a transition from anti-Klein tunneling to nearly perfect Klein tunneling.

Journal or Publication Title: Physical Review Letters
Journal volume: 121
Number: 12
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 12:12
DOI: 10.1103/PhysRevLett.121.127706
Official URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.12...
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