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Tuning Anti-Klein to Klein Tunneling in Bilayer Graphene

Du, Renjun 1; Liu, M.-H.; Mohrmann, Jens 1; Wu, Fan 1; Krupke, Ralph 1; Von Löhneysen, Hilbert 1; Richter, K.; Danneau, Romain 1
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)

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.


Verlagsausgabe §
DOI: 10.5445/IR/1000086234
Veröffentlicht am 10.01.2022
Originalveröffentlichung
DOI: 10.1103/PhysRevLett.121.127706
Scopus
Zitationen: 27
Web of Science
Zitationen: 26
Dimensions
Zitationen: 27
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 21.09.2018
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114, 1092-0145
KITopen-ID: 1000086234
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Physical review letters
Verlag American Physical Society (APS)
Band 121
Heft 12
Seiten Art.Nr. 127706
Nachgewiesen in Dimensions
Web of Science
Scopus
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