Year: 2021
Type: article
Abstract: 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 Co_{3}Sn_{2}S_{2}, 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.
Source: Physical Review Letters
Authors: Ilya Belopolski, Tyler A. Cochran, Xiaoxiong Liu, Zi-Jia Cheng, Xian P. Yang, Zurab Guguchia, Stepan S. Tsirkin, Jia-Xin Yin, Praveen Vir, Gohil S. Thakur, Songtian S. Zhang, Junyi Zhang, Konstantine Kaznatcheev, Guangming Cheng, Guoqing Chang, Daniel Multer, Nana Shumiya, Maksim Litskevich, Elio Vescovo, Timur K. Kim, Cephise Cacho, Nan Yao, Claudia Felser, Titus Neupert, M. Zahid Hasan
Institutions: Princeton University, RIKEN Center for Emergent Matter Science, University of Zurich, Paul Scherrer Institute, Max Planck Institute for Chemical Physics of Solids, Technische Universität Dresden, Brookhaven National Laboratory, National Synchrotron Light Source II, Nanyang Technological University, Diamond Light Source, Lawrence Berkeley National Laboratory
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, U.S. Department of Energy, Gordon and Betty Moore Foundation, Princeton University, Diamond Light Source, Princeton Center for Complex Materials, European Commission, National Research Foundation, National Research Foundation Singapore, Nanyang Technological University, Deutsche Forschungsgemeinschaft, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, China Scholarship Council, Office of Science, Horizon 2020 Framework Programme, Materials Research Science and Engineering Center, Harvard University, Division of Materials Research, Basic Energy Sciences, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, SLAC National Accelerator Laboratory
Awards: G1023382291, G1210759672, G1229526393, G1285306620, G1286251239, G1746067696, G1847291448, G1868695577, G2013908898, G2047936179, G2152757567, G2174132073, G227874024, G2292069225, G2371548206, G241279073, G2416988458, G262532246, G2696751721, SYNCHOTRON X-RAY BASED ELECTRONIC STRUCTURE STUDY OF CORRELATED QUANTUM MATERIALS, G2956393544, G2984103368, G303061748, G3031809386, G3262563802, G357145406, G3603580073, G3850097093, G3884951186, G4149624025, G4235786860, Graduate Research Fellowship Program (GRFP), G434337789, G4654690619, G4657894069, G4662383146, G4711507462, G4908923434, G4915342213, G495301720, G4972998915, G498139845, G504012299, G507888039, G5417557083, G5473946529, G5570207115, G5633341255, G5765906131, G580951548, Visual Prosthesis: From Clinical Trials to the Psychophysics Lab and Back, G5989841040, G628751139, G6536552022, G6550344761, M. Zahid Hasan Experimental Investigator in Quantum Materials Award, G6733788163, Princeton Center for Complex Materials, Topological Phases: From New Fermions to Materials and Devices, G6965541988, G7083997402, G7283024673, G7313278570, G7463374569, G780436692, SFB 1143: Korrelierter Magnetismus: Von Frustration zu Topologie, G8326473154, G8382000481, M. Zahid Hasan Experimental Investigator Award, G872144517, G8945569637, G9000170913, G9000363078, G9000842863, G911061179, G936330020, G969889393
OpenAlex ID: W4200383435