Tunable geometric phase of Dirac fermions in a topological junction

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We predict a tunable and nonadiabatic Berry phase effect of Dirac fermions, which is an electronic analog of the Pancharatnam phase of polarized light. The Berry phase occurs as a scattering phase shift in a single scattering event of transmission or reflection of Dirac fermions at a junction with a spatially nonuniform mass gap, unveiling the topological aspects of scattering of chiral Dirac fermions. This geometric phase plays different roles in solids as compared with the Pancharatnam phase in optics. It provides a unique approach of detecting the Chern number of the insulator side in a metal-insulator junction of Dirac fermions, implying a different type of bulk-edge correspondence at the boundary between a metal and an insulator. This phase also modifies the quantization rule of Dirac fermions, suggesting geometric-phase devices with nontrivial charge and spin transport such as a topological waveguide and a topological transistor. DOI: 10.1103/PhysRevB.87.165420
Publisher
AMER PHYSICAL SOC
Issue Date
2013-04
Language
English
Article Type
Article
Keywords

BERRYS PHASE; ELECTRONIC-PROPERTIES; GRAPHENE; INSULATORS; SURFACE; STATES

Citation

PHYSICAL REVIEW B, v.87, no.16

ISSN
1098-0121
DOI
10.1103/PhysRevB.87.165420
URI
http://hdl.handle.net/10203/173919
Appears in Collection
PH-Journal Papers(저널논문)
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