Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.127706
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [689, DA 1280/3-1, Ri 681-13/1]
- program of the Forschungsgrossgerate [121384/17-1]
- MOST [107-2112-M-006-004-MY3]
- Helmholtz association through the program STN
- DFG Center for Functional Nanostructures (CFN)
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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-Perot 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 2 pi down to 0.68 pi in gapped bilayer graphene, in contrast to the constant Berry phase of 2 pi in pristine bilayer graphene. Particularly, we observe a Berry phase of pi, 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.
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