Signatures of Weyl fermion annihilation in a correlated kagome magnet
The manipulation of topological states in quantum matter is an essential pursuit of fundamental physics and next-generation quantum technology. Here we report the magnetic manipulation of Weyl fermions in the kagome spin-orbit semimetal Co3Sn2S2, observed by high-resolution photoemission spectrosc...
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Science::Physics Weyl Semimetals Topological Materials Belopolski, Ilya Cochran, Tyler A. Liu, Xiaoxiong Cheng, Zi-Jia Yang, Xian P. Guguchia, Zurab Tsirkin, Stepan S. Yin, Jia-Xin Vir, Praveen Thakur, Gohil S. Zhang, Songtian S. Zhang, Junyi Kaznatcheev, Konstantine Cheng, Guangming Chang, Guoqing Multer, Daniel Shumiya, Nana Litskevich, Maksim Vescovo, Elio Kim, Timur K. Cacho, Cephise Yao, Nan Felser, Claudia Neupert, Titus Hasan, M. Zahid Signatures of Weyl fermion annihilation in a correlated kagome magnet |
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The manipulation of topological states in quantum matter is an essential pursuit of fundamental physics and next-generation quantum technology. Here we report the magnetic manipulation of Weyl fermions in the kagome spin-orbit semimetal
Co3Sn2S2, observed by high-resolution photoemission spectroscopy. We demonstrate the exchange collapse of spin-orbit-gapped ferromagnetic Weyl loops into paramagnetic Dirac loops under suppression of the magnetic order. We further observe that topological Fermi arcs disappear in the paramagnetic phase, suggesting the annihilation of exchange-split Weyl points. Our findings indicate that magnetic exchange collapse naturally drives Weyl fermion annihilation, opening new opportunities for engineering topology under correlated order parameters. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Belopolski, Ilya Cochran, Tyler A. Liu, Xiaoxiong Cheng, Zi-Jia Yang, Xian P. Guguchia, Zurab Tsirkin, Stepan S. Yin, Jia-Xin Vir, Praveen Thakur, Gohil S. Zhang, Songtian S. Zhang, Junyi Kaznatcheev, Konstantine Cheng, Guangming Chang, Guoqing Multer, Daniel Shumiya, Nana Litskevich, Maksim Vescovo, Elio Kim, Timur K. Cacho, Cephise Yao, Nan Felser, Claudia Neupert, Titus Hasan, M. Zahid |
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Article |
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Belopolski, Ilya Cochran, Tyler A. Liu, Xiaoxiong Cheng, Zi-Jia Yang, Xian P. Guguchia, Zurab Tsirkin, Stepan S. Yin, Jia-Xin Vir, Praveen Thakur, Gohil S. Zhang, Songtian S. Zhang, Junyi Kaznatcheev, Konstantine Cheng, Guangming Chang, Guoqing Multer, Daniel Shumiya, Nana Litskevich, Maksim Vescovo, Elio Kim, Timur K. Cacho, Cephise Yao, Nan Felser, Claudia Neupert, Titus Hasan, M. Zahid |
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Belopolski, Ilya |
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Signatures of Weyl fermion annihilation in a correlated kagome magnet |
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Signatures of Weyl fermion annihilation in a correlated kagome magnet |
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Signatures of Weyl fermion annihilation in a correlated kagome magnet |
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Signatures of Weyl fermion annihilation in a correlated kagome magnet |
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Signatures of Weyl fermion annihilation in a correlated kagome magnet |
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signatures of weyl fermion annihilation in a correlated kagome magnet |
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2022 |
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https://hdl.handle.net/10356/155549 |
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sg-ntu-dr.10356-1555492023-02-28T20:00:40Z Signatures of Weyl fermion annihilation in a correlated kagome magnet Belopolski, Ilya Cochran, Tyler A. Liu, Xiaoxiong Cheng, Zi-Jia Yang, Xian P. Guguchia, Zurab Tsirkin, Stepan S. Yin, Jia-Xin Vir, Praveen Thakur, Gohil S. Zhang, Songtian S. Zhang, Junyi Kaznatcheev, Konstantine Cheng, Guangming Chang, Guoqing Multer, Daniel Shumiya, Nana Litskevich, Maksim Vescovo, Elio Kim, Timur K. Cacho, Cephise Yao, Nan Felser, Claudia Neupert, Titus Hasan, M. Zahid School of Physical and Mathematical Sciences Science::Physics Weyl Semimetals Topological Materials The manipulation of topological states in quantum matter is an essential pursuit of fundamental physics and next-generation quantum technology. Here we report the magnetic manipulation of Weyl fermions in the kagome spin-orbit semimetal Co3Sn2S2, observed by high-resolution photoemission spectroscopy. We demonstrate the exchange collapse of spin-orbit-gapped ferromagnetic Weyl loops into paramagnetic Dirac loops under suppression of the magnetic order. We further observe that topological Fermi arcs disappear in the paramagnetic phase, suggesting the annihilation of exchange-split Weyl points. Our findings indicate that magnetic exchange collapse naturally drives Weyl fermion annihilation, opening new opportunities for engineering topology under correlated order parameters. National Research Foundation (NRF) Accepted version The authors thank D. Lu and M. Hashimoto at Beamline 5-2 of the Stanford Synchrotron Radiation Lightsource (SSRL) at the SLAC National Accelerator Laboratory, CA, USA for support. The authors thank Diamond Light Source for access to Beamline I05 (SI17924, SI19313). This research used Beamline 21-ID-1 (ESM-ARPES) of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors also acknowledge use of Princeton University’s Imaging and Analysis Center, which is partially supported by the Princeton Center for Complex Materials (PCCM), a National Science Foundation (NSF)-MRSEC program (DMR-2011750). Use of the Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accele- rator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-76SF00515. T. A. C. ackno- wledges the support of the National Science Foundation Graduate Research Fellowship Program (DGE-1656466). T. N. and S. S. T. acknowledge support from the European Union Horizon 2020 Research and Innovation Program (ERC-StG-Neupert-757867-PARATOP). S. S. T. also acknowledge support from the Swiss National Science Foundation (Grant No. PP00P2-176877). X. L. acknowl- edges financial support from the China Scholarship Council. G. C. would like to acknowledge the support of the National Research Foundation, Singapore under its NRF Fellowship Award (NRF-NRFF13-2021-0010) and the Nanyang Assistant Professorship grant from Nanyang Technological University. M. Z. H. acknowledges visiting scientist support at Berkeley Lab (LBNL) during the early phases of this work. Work at Princeton University was supported by the Gordon and Betty Moore Foundation (Grants No. GBMF4547 and No. GBMF9461; M. Z. H.). The ARPES and theoretical work were supported by the United States Department of Energy (US DOE) under the Basic Energy Sciences programme (Grant No. DOE/BES DE-FG-02-05ER46200; M. Z. H.). G. S. T. thanks the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter – ct.qmat (EXC 2147) for postdoctoral funding. C. F. acknowledges the DFG through SFB 1143 (project ID. 247310070) and the Würzburg- Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter ct.qmat (EXC2147, project ID. 39085490). 2022-03-04T01:13:35Z 2022-03-04T01:13:35Z 2021 Journal Article Belopolski, I., Cochran, T. A., Liu, X., Cheng, Z., Yang, X. P., Guguchia, Z., Tsirkin, S. S., Yin, J., Vir, P., Thakur, G. S., Zhang, S. S., Zhang, J., Kaznatcheev, K., Cheng, G., Chang, G., Multer, D., Shumiya, N., Litskevich, M., Vescovo, E., ...Hasan, M. Z. (2021). Signatures of Weyl fermion annihilation in a correlated kagome magnet. Physical Review Letters, 127(25), 256403-. https://dx.doi.org/10.1103/PhysRevLett.127.256403 0031-9007 https://hdl.handle.net/10356/155549 10.1103/PhysRevLett.127.256403 25 127 256403 en NRF-NRFF13-2021-0010 020375-00001(Theoretical and Numerical Study of Topological Materials for Applications in Next-Generation Quantum Devices) Physical Review Letters © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society. application/pdf |