期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.216402
关键词
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资金
- Swiss National Science Foundation (SNSF) [200020_188648, P2ELP2_181877, P300P2-171221]
- NCCR
- European Union Horizon 2020 Research and Innovation Program [ERC-StG-Neupert757867-PARATOP]
- Swiss National Science Foundation [PP00P2_176877]
- ERC [695197]
- Swiss National Science Foundation NCCR:MUST Grant
- Department of Energy, Office of Science [DE-FG02-07ER46405]
- National Science Foundation [1144469]
- Swiss National Supercomputing Centre (CSCS) [s832, s1008]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- Swiss National Science Foundation (SNF) [P2ELP2_181877, 200020_188648] Funding Source: Swiss National Science Foundation (SNF)
- European Research Council (ERC) [695197] Funding Source: European Research Council (ERC)
- Division Of Graduate Education
- Direct For Education and Human Resources [1144469] Funding Source: National Science Foundation
Trigonal tellurium, a small-gap semiconductor with pronounced magneto-electric and magneto-optical responses, is among the simplest realizations of a chiral crystal. We have studied by spin- and angle-resolved photoelectron spectroscopy its unconventional electronic structure and unique spin texture. We identify Kramers-Weyl, composite, and accordionlike Weyl fermions, so far only predicted by theory, and show that the spin polarization is parallel to the wave vector along the lines in k space connecting high-symmetry points. Our results clarify the symmetries that enforce such spin texture in a chiral crystal, thus bringing new insight in the formation of a spin vectorial field more complex than the previously proposed hedgehog configuration. Our findings thus pave the way to a classification scheme for these exotic spin textures and their search in chiral crystals.
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