期刊
PHYSICAL REVIEW LETTERS
卷 116, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.066801
关键词
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资金
- Aspen Center for Physics (NSF) [1066293]
- Aspen Center for Physics (Trustees Fund)
- Kavli Institute for Theoretical Physics (NSF) [PHY11-25915]
- UT-Dallas research enhancement funds
- MOST Project of China [2014CB920903, 2013CB921903]
- NSFC [11574029, 11404022, 11225418]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20121101110046]
- BIT Basic Research Funds [20141842001]
While strong topological insulators (STIs) were experimentally realized soon after they were theoretically predicted, a weak topological insulator (WTI) has yet to be unambiguously confirmed. A major obstacle is the lack of distinct natural cleavage surfaces to test the surface selective hallmark of a WTI. With a new scheme, we discover that beta-Bi4X4 (X = Br, I), dynamically stable or synthesized before, can be a prototype WTI with two natural cleavage surfaces, where two anisotropic Dirac cones stabilize and annihilate, respectively. We further find four surface-state Lifshitz transitions under charge doping and two bulk topological phase transitions under uniaxial strain. Near the WTI-STI transition, there emerges a novel Weyl semimetal phase, in which the Fermi arcs generically appear at both cleavage surfaces whereas the Fermi circle only appears at one selected surface.
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