Valley-polarized interlayer conduction of anisotropic Dirac fermions in SrMnBi2.
We report the valley-selective interlayer conduction of SrMnBi(2) under in-plane magnetic fields. The c-axis resistivity of SrMnBi(2) 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.
Department of Physics, Kyungpook National University, Daegu 702-710, Korea.
Y J
YJ
Jo
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
Joonbum
J
Park
Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea.
G
G
Lee
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
Man Jin
MJ
Eom
National High Magnetic field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
E S
ES
Choi
Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea.
Ji Hoon
JH
Shim
Department of Physics, Ewha Womans University, Seoul 120-750, Korea.
W
W
Kang
Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
Jun Sung
JS
Kim