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Berry phase and pseudospin winding number in bilayer graphene

Cited 53 time in Web of Science Cited 62 time in Scopus
Authors

Park, Cheol-Hwan; Marzari, Nicola

Issue Date
2011-11
Publisher
American Physical Society
Citation
Physical Review B, Vol.84 No.20, p. 205440
Abstract
Ever since the novel quantum Hall effect in bilayer graphene was discovered, and explained by a Berry phase of 2π, it has been widely accepted that the low-energy electronic wave function in this system is described by a nontrivial Berry phase of 2π, different from the zero phase of a conventional two-dimensional electron gas. Here, we show that (i) the relevant Berry phase for bilayer graphene is not different from that for a conventional two-dimensional electron gas (as expected, given that Berry phase is only meaningful modulo 2π), and (ii) what is actually observed in the quantum Hall measurements is not the absolute value of the Berry phase but the pseudospin winding number. © 2011 American Physical Society.
ISSN
2469-9950
URI
https://hdl.handle.net/10371/202345
DOI
https://doi.org/10.1103/PhysRevB.84.205440
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  • College of Natural Sciences
  • Department of Physics and Astronomy
Research Area Condensed Matter Physics, Nanoscale Photonics, Nanoscale Physics, 나노 물리와 나노 광자학, 응집 물질 물리

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