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

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

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Title: Weak Topological Insulators and Composite Weyl Semimetals: β-Bi₄Χ₄ (Χ = Br, I)
Author(s):
Liu, Cheng-Cheng;
Zhou, Jin-Jian;
Yao, Yugui;
Zhang, Fan (UT Dallas)
Keywords: Phase transformations (Statistical physics)l
Weak interactions (Nuclear physics)
Strong interactions (Nuclear physics
Bi4br4
Description: Includes supplementary material.
Abstract: 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 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.
Publisher: Amer Physical Soc
ISSN: 0031-9007
Persistent Link: http://hdl.handle.net/10735.1/5378
http://dx.doi.org/10.1103/PhysRevLett.116.066801
Bibliographic Citation: Liu, 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.116.066801
Terms of Use: ©2016 American Physical Society. All rights reserved
Sponsors: Aspen 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).

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