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; Z. Q. Mao

doi:10.1038/s41467-021-24369-1

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. LaiKun Yang, J. W. Sun, N. Alem, V. Gopalan, C. Z. Chang, N. Samarth, C. X. Liu, R. D. McDonald, Z. Q. Mao

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

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.

Original language	English
Article number	4062
Journal	Nature Communications
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41467-021-24369-1
State	Published - Dec 1 2021

Funding

We thank Jainendra Jain for insightful comments. This work was supported by the US Department of Energy under grants DE-SC0019068 and DE-SC0014208 (support for personnel, sample synthesis, high-field measurements, and data analyses); a part of sample synthesis and high-field measurements was supported by the U.S. Department of Energy under EPSCoR grant No. DESC0012432 with additional support from the Louisiana Board of Regents. Work at the National High Magnetic Field Laboratory was supported by National Science Foundation (NSF) DMR-1644779, the State of Florida, and the U.S. Department of Energy (DOE). F.B. and M.J. acknowledge support from the DOE BES ‘Science of 100 T’ program, R.D.M. and Y.L. acknowledge support from the Center for the Advancement of Topological Semimetals, an Energy Frontier Research Center funded by the U.S. DOE, Office of Basic Energy Sciences. R.D.M. also acknowledges support from the LANL LDRD DR20160085 ‘Topology and Strong Correlations’ for the start of this work. The preliminary ARPES experiment was carried out at the 2DCC-MIP supported by NSF cooperative agreement DMR 1539916. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. K.Y.’s work is supported by National Science Foundation grants DMR-1932796 and DMR-1644779. J.H.’s work is supported by the US Department of Energy (support for some of the transport data analyses), Office of Science, Basic Energy Sciences under grant DE-SC0019467. H.B.C. and B.C.C. acknowledge the neutron scattering user facility sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Departmen of Energy. L.M., K.A.L., V.G., and N.A. are supported by NSF through the Pennsylvania State University Materials Research Science and Engineering Center DMR 2011839. L.M. and N.A. also acknowledge the Air Force Office of Science Research (AFOSR) program FA9550-18-0277 for support. L.M., K.A.L. and N.A’s work utilized resources provided by the NSF-MRSEC-sponsored Materials Characterization Lab at Penn State. C.X.L. and J.Y. acknowledge the support of the U.S. Department of Energy (Grant No. DESC0019064) for the development of the theoretical model, and also the support from the Office of Naval Research (Grant No. N00014-18-1-2793) and Kaufman New Initiative research grant KA2018-98553 of the Pittsburgh Foundation. C.Z.C. acknowledges the support from the NSF-CAREER award (DMR-1847811) and the Gordon and Betty Moore Foundation’s EPiQS Initiative (GBMF9063 to C.Z.C.).

Funders	Funder number
LANL LDRD	DMR 1539916, DR20160085
NSF-CAREER	DMR-1847811
Pennsylvania State University Materials Research Science and Engineering Center	DMR 2011839
State of Florida
National Science Foundation	DMR-1644779
Office of Naval Research	N00014-18-1-2793, KA2018-98553
U.S. Department of Energy	DE-SC0014208, DE-SC0019068
Air Force Office of Scientific Research	FA9550-18-0277, DESC0019064
Gordon and Betty Moore Foundation	GBMF9063
Pittsburgh Foundation
Office of Experimental Program to Stimulate Competitive Research	DESC0012432
Office of Science	DMR-1932796, DE-AC02-76SF00515
Basic Energy Sciences	DE-SC0019467
Louisiana Board of Regents

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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., Chakoumakos, B. C., Balakirev, F., Weickert, F., Jaime, M., ... Mao, Z. Q. (2021). Spin-valley locking and bulk quantum Hall effect in a noncentrosymmetric Dirac semimetal BaMnSb₂. Nature Communications, 12(1), Article 4062. https://doi.org/10.1038/s41467-021-24369-1

@article{df7ed4f439e2433e913e77b16c53af9b,

title = "Spin-valley locking and bulk quantum Hall effect in a noncentrosymmetric Dirac semimetal BaMnSb2",

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.",

author = "Liu, {J. Y.} and J. Yu and Ning, {J. L.} and Yi, {H. M.} and L. Miao and Min, {L. J.} and Zhao, {Y. F.} and W. Ning and Lopez, {K. A.} and Zhu, {Y. L.} and T. Pillsbury and Zhang, {Y. B.} and Y. Wang and J. Hu and Cao, {H. B.} and Chakoumakos, {B. C.} and F. Balakirev and F. Weickert and M. Jaime and Y. Lai and Kun Yang and Sun, {J. W.} and N. Alem and V. Gopalan and Chang, {C. Z.} and N. Samarth and Liu, {C. X.} and McDonald, {R. D.} and Mao, {Z. Q.}",

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year = "2021",

month = dec,

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doi = "10.1038/s41467-021-24369-1",

language = "English",

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Liu, JY, Yu, J, Ning, JL, Yi, HM, Miao, L, Min, LJ, Zhao, YF, Ning, W, Lopez, KA, Zhu, YL, Pillsbury, T, Zhang, YB, Wang, Y, Hu, J, Cao, HB, Chakoumakos, BC, Balakirev, F, Weickert, F, Jaime, M, Lai, Y, Yang, K, Sun, JW, Alem, N, Gopalan, V, Chang, CZ, Samarth, N, Liu, CX, McDonald, RD & Mao, ZQ 2021, 'Spin-valley locking and bulk quantum Hall effect in a noncentrosymmetric Dirac semimetal BaMnSb₂', Nature Communications, vol. 12, no. 1, 4062. https://doi.org/10.1038/s41467-021-24369-1

TY - JOUR

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AU - Liu, J. Y.

AU - Yu, J.

AU - Ning, J. L.

AU - Yi, H. M.

AU - Miao, L.

AU - Min, L. J.

AU - Zhao, Y. F.

AU - Ning, W.

AU - Lopez, K. A.

AU - Zhu, Y. L.

AU - Pillsbury, T.

AU - Zhang, Y. B.

AU - Wang, Y.

AU - Hu, J.

AU - Cao, H. B.

AU - Chakoumakos, B. C.

AU - Balakirev, F.

AU - Weickert, F.

AU - Jaime, M.

AU - Lai, Y.

AU - Yang, Kun

AU - Sun, J. W.

AU - Alem, N.

AU - Gopalan, V.

AU - Chang, C. Z.

AU - Samarth, N.

AU - Liu, C. X.

AU - McDonald, R. D.

AU - Mao, Z. Q.

PY - 2021/12/1

Y1 - 2021/12/1

N2 - 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.

AB - 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.

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VL - 12

JO - Nature Communications

JF - Nature Communications

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

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