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Liu, J. Y; Yu, J; Ning, J. L; Yi, H. M; Miao, L; Min, L. J; Zhao, Y. F; Ning, W; Lopez, K. A; Zhu, Y. L; Pillsbury, T; Zhang, Y. B; Wang, Y; Hu, J; Cao, H. B; Balakirev, F; Weickert, F; Jaime, M; Lai, Y; Yang, Kun; Sun, J. W; Alem, N; Gopalan, V; Chang, C. Z; Samarth, N; Liu, C. X; Mcdonald, R. D; Mao, Z. Q
07/2019Journal Article
NATURE COMMUNICATIONS 12:4062 (2021) Spin-valley locking in the band structure of monolayers of MoS$_2$ and other group-VI 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 bulk Dirac semimetal BaMnSb$_2$. We find valley and spin are inherently coupled for both valence and conduction bands in this material. This is revealed by comprehensive studies using first principle calculations, tight-binding and effective model analyses, angle-resolved photoemission spectroscopy and quantum transport measurements. Moreover, this material also exhibits a stacked quantum Hall effect. The spin-valley degeneracy extracted from the plateau height of quantized Hall resistivity is close to 2. This result, together with the observed Landau level spin splitting, further confirms the spin-valley locking picture. In the extreme quantum limit, we have also observed a two-dimensional chiral metal at the side surface, which represents a novel topological quantum liquid. These findings establish BaMnSb$_2$ as a rare platform for exploring coupled spin and valley physics in bulk single crystals and accessing 3D interacting topological states.
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in: SICRIS
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