Weak Topological Insulators and Composite Weyl Semimetals: β-Bi₄Χ₄ (Χ = Br, I)

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dc.contributor.ORCID0000-0003-4623-4200 (Zhang, F)en_US
dc.contributor.authorLiu, Cheng-Chengen_US
dc.contributor.authorZhou, Jin-Jianen_US
dc.contributor.authorYao, Yuguien_US
dc.contributor.authorZhang, Fanen_US
dc.contributor.utdAuthorZhang, Fanen_US
dc.date.accessioned2017-04-26T20:05:03Z
dc.date.available2017-04-26T20:05:03Z
dc.date.created2016-02-09en_US
dc.date.issued2016-02-09en_US
dc.descriptionIncludes supplementary material.en_US
dc.description.abstractWhile 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 β-Bi₄Χ₄ (Χ = 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.en_US
dc.description.sponsorshipAspen Center for Physics (NSF grant no. 1066293); Kavli Institute for Theoretical Ohysics (NSF grant no. PHY11-25915); the MOST Project of China (no. 2014CB920903 and no. 2013CB921903); NSFC (grants no. 11574029, no.11404022, and no 11225418); the Specialized Research Fund for the Doctoral Program of Higher Education of China (grant no. 20121101110046); the BIT Basic Research Funds (grant no. 20141842001).en_US
dc.identifier.bibliographicCitationLiu, Cheng-Cheng, Jin-Jian Zhou, Yugui Yao, and Fan Zhang. 2016. "Weak Topological Insulators and Composite Weyl Semimetals: β-Bi₄Χ₄ (Χ = Br, I)" Physical Review Letters 116(6), doi:10.1103/PhysRevLett.116.066801en_US
dc.identifier.issn0031-9007en_US
dc.identifier.issue6en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/5378
dc.identifier.volume116en_US
dc.language.isoenen_US
dc.publisherAmer Physical Socen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevLett.116.066801
dc.rights©2016 American Physical Society. All rights reserveden_US
dc.sourcePhysical Review Letters
dc.subjectPhase transformations (Statistical physics)len_US
dc.subjectWeak interactions (Nuclear physics)en_US
dc.subjectStrong interactions (Nuclear physicsen_US
dc.subjectBi4br4en_US
dc.titleWeak Topological Insulators and Composite Weyl Semimetals: β-Bi₄Χ₄ (Χ = Br, I)en_US

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