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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport
  • electron correlation, dynamical mean field theory
  • 2D materials, metal complexes

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Valley-Polarized Interlayer Conduction of Anisotropic Dirac Fermions in SrMnBi2

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Title
Valley-Polarized Interlayer Conduction of Anisotropic Dirac Fermions in SrMnBi2
Author
Jo, YJPark, JoonbumLee, GeunsikEom, Man JinChoi, ESShim, Ji HoonKang, WKim, Jun Sung
Issue Date
2014-10
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.113, pp.156602
Abstract
We report the valley-selective interlayer conduction of SrMnBi2 under in-plane magnetic fields. The c-axis resistivity of SrMnBi2 shows clear angular magnetoresistance oscillations indicating coherent interlayer conduction. Strong fourfold variation of the coherent peak in the c-axis resistivity reveals that the contribution of each Dirac valley is significantly modulated by the in-plane field orientation. This originates from anisotropic Dirac Fermi surfaces with strong disparity in the momentum-dependent interlayer coupling. Furthermore, we found a signature of broken valley symmetry at high magnetic fields. These findings demonstrate that a quasi-two-dimensional anisotropic Dirac system can host a valley-polarized interlayer current through magnetic valley control. © 2014 American Physical Society.
URI
https://scholarworks.unist.ac.kr/handle/201301/13125
URL
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.113.156602
DOI
10.1103/PhysRevLett.113.156602
ISSN
0031-9007
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CHM_Journal Papers
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