期刊
NATURE PHYSICS
卷 8, 期 8, 页码 616-622出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS2351
关键词
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资金
- US National Science Foundation Grant [NSF-DMR-1006492]
- A. P. Sloan Foundation
- Swedish Research Council
- Knut and Alice Wallenberg Foundation
- Swiss Light Source
- Swiss National Science Foundation
- German Federal Ministry of Education and Research
- Basic Energy Sciences of the US Department of Energy
- US Department of Energy [DE-FG02-07ER46352, AC03-76SF00098]
- National Science Council
- Academia Sinica in Taiwan
- US DARPA [N66001-11-1-4110]
- US DOE
- [NSF-DMR-0819860]
- [DE-FG02-05ER46200]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006492] Funding Source: National Science Foundation
Understanding and control of spin degrees of freedom on the surfaces of topological materials are key to future applications as well as for realizing novel physics such as the axion electrodynamics associated with time-reversal (TR) symmetry breaking on the surface. We experimentally demonstrate magnetically induced spin reorientation phenomena simultaneous with a Dirac-metal to gapped-insulator transition on the surfaces of manganese-doped Bi2Se3 thin films. The resulting electronic groundstate exhibits unique hedgehog-like spin textures at low energies, which directly demonstrate the mechanics of TR symmetry breaking on the surface. We further show that an insulating gap induced by quantum tunnelling between surfaces exhibits spin texture modulation at low energies but respects TR invariance. These spin phenomena and the control of their Fermi surface geometrical phase first demonstrated in our experiments pave the way for the future realization of many predicted exotic magnetic phenomena of topological origin.
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