Valley-polarized interlayer conduction of anisotropic Dirac fermions in SrMnBi2

Y. J. Jo, Joonbum Park, G. Lee, Man Jin Eom, E. S. Choi, Ji Hoon Shim, W. Kang, Jun Sung Kim

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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.

Original languageEnglish
Article number156602
JournalPhysical Review Letters
Volume113
Issue number15
DOIs
StatePublished - 6 Oct 2014

Bibliographical note

Publisher Copyright:
© 2014 American Physical Society.

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