Berry phase jumps and giant nonreciprocity in Dirac quantum dots
Name
PhysRevB.94.235406.pdf
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1.52 MB
Format
Adobe PDF
Checksum (MD5)
60dc880a633ec4b78b234594275119f2
Author(s)
Rodriguez Nieva, Joaquin Francisco
Levitov, Leonid
Date Issued
December 2016
Journal
Physical Review B
Publisher
American Physical Society
Citation
Rodriguez-Nieva, Joaquin F., and Leonid S. Levitov. “Berry Phase Jumps and Giant Nonreciprocity in Dirac Quantum Dots.” Physical Review B 94.23 (2016): n. pag. © 2016 American Physical Society
Version
Final published version
Abstract
We predict that a strong nonreciprocity in the resonance spectra of Dirac quantum dots can be induced by the Berry phase. The nonreciprocity arises in relatively weak magnetic fields and is manifest in anomalously large field-induced splittings of quantum dot resonances which are degenerate at B=0 due to time-reversal symmetry. This exotic behavior, which is governed by field-induced jumps in the Berry phase of confined electronic states, is unique to quantum dots in Dirac materials and is absent in conventional quantum dots. The effect is strong for gapless Dirac particles and can overwhelm the B-induced orbital and Zeeman splittings. A finite Dirac mass suppresses the effect. The nonreciprocity, predicted for generic two-dimensional Dirac materials, is accessible through Faraday and Kerr optical rotation measurements and scanning tunneling spectroscopy.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.94.235406
