Spin-valley locking and bulk quantum Hall effect in a noncentrosymmetric Dirac semimetal BaMnSb2

J. Y. Liu, J. Yu, J. L. Ning, H. M. Yi, L. Miao, L. J. Min, Y. F. Zhao, W. Ning, K. A. Lopez, Y. L. Zhu, T. Pillsbury, Y. B. Zhang, Y. Wang, J. Hu, H. B. Cao, B. C. Chakoumakos, F. Balakirev, F. Weickert, M. Jaime, Y. Lai, Kun Yang, J. W. Sun, N. Alem, V. Gopalan, C. Z. Chang, N. Samarth, C. X. Liu (), R. D. McDonald () and Z. Q. Mao ()
Additional contact information
J. Y. Liu: Tulane University
J. Yu: The Pennsylvania State University
J. L. Ning: Tulane University
H. M. Yi: The Pennsylvania State University
L. Miao: The Pennsylvania State University
L. J. Min: The Pennsylvania State University
Y. F. Zhao: The Pennsylvania State University
W. Ning: The Pennsylvania State University
K. A. Lopez: The Pennsylvania State University
Y. L. Zhu: The Pennsylvania State University
T. Pillsbury: The Pennsylvania State University
Y. B. Zhang: Tulane University
Y. Wang: The Pennsylvania State University
J. Hu: University of Arkansas
H. B. Cao: Neutron Scattering Division, Oak Ridge National Laboratory
B. C. Chakoumakos: Neutron Scattering Division, Oak Ridge National Laboratory
F. Balakirev: Los Alamos National Laboratory
F. Weickert: Los Alamos National Laboratory
M. Jaime: Los Alamos National Laboratory
Y. Lai: Los Alamos National Laboratory
Kun Yang: Florida State University
J. W. Sun: Tulane University
N. Alem: The Pennsylvania State University
V. Gopalan: The Pennsylvania State University
C. Z. Chang: The Pennsylvania State University
N. Samarth: The Pennsylvania State University
C. X. Liu: The Pennsylvania State University
R. D. McDonald: Los Alamos National Laboratory
Z. Q. Mao: Tulane University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Spin-valley locking in monolayer transition metal dichalcogenides has attracted enormous interest, since it offers potential for valleytronic and optoelectronic applications. Such an exotic electronic state has sparsely been seen in bulk materials. Here, we report spin-valley locking in a Dirac semimetal BaMnSb2. This is revealed by comprehensive studies using first principles calculations, tight-binding and effective model analyses, angle-resolved photoemission spectroscopy measurements. Moreover, this material also exhibits a stacked quantum Hall effect (QHE). The spin-valley degeneracy extracted from the QHE is close to 2. This result, together with the Landau level spin splitting, further confirms the spin-valley locking picture. In the extreme quantum limit, we also observed a plateau in the z-axis resistance, suggestive of a two-dimensional chiral surface state present in the quantum Hall state. These findings establish BaMnSb2 as a rare platform for exploring coupled spin and valley physics in bulk single crystals and accessing 3D interacting topological states.

Date: 2021
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DOI: 10.1038/s41467-021-24369-1

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