Weyl points created by a three-dimensional flat band

Zhou, Yinong; Jin, Kyung-Hwan; Huang, Huaqing; Wang, Zhengfei; Liu, Feng

doi:10.1103/PhysRevB.99.201105

Title: Weyl points created by a three-dimensional flat band

Journal Article · Mon May 13 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.201105· OSTI ID:1527174

Zhou, Yinong ^[1]; Jin, Kyung-Hwan ^[1]; Huang, Huaqing ^[1]; Wang, Zhengfei ^[2]; Liu, Feng ^[3]

Univ. of Utah, Salt Lake City, UT (United States)
Univ. of Science and Technology of China, Hefei (China)
Univ. of Utah, Salt Lake City, UT (United States); Collaborative Innovation Center of Quantum Matter, Beijing (China)

Following the discovery of topological insulators (TIs), topological Dirac/Weyl semimetal has attracted much recent interest. A prevailing mechanism for the formation of Weyl points is by breaking time-reversal symmetry (TRS) or spatial inversion symmetry of a Dirac point. Here we demonstrate a generic formation mechanism for Weyl points by breaking TRS of a three-dimensional (3D) TI featured with highly degenerate 3D flat bands (FBs). It is in direct contrast to the conventional view that breaking TRS of a 2D/3D TI leads to a Chern insulator exhibiting quantum anomalous Hall effect. Based on a tight-binding model of pyrochlore lattice, we show that this unusual 3D-FB-enabled Weyl state may contain only a minimum of two Weyl points. Furthermore, using first-principles calculations, we identify this Weyl state in a real material Sn₂Nb₂O₇. The main features of the resulting Weyl points are analyzed with respect to symmetry, topological invariant and surface state. Finally, our finding sheds new light on our fundamental understanding of topological physics and significantly extends the scope of Weyl semimetals to attract immediate experimental interest.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-04ER46148

OSTI ID:: 1527174

Alternate ID(s):: OSTI ID: 1512351

Journal Information:: Physical Review B, Vol. 99, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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