期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 114, 期 40, 页码 10596-10600出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1713261114
关键词
honeycomb lattice; ideal Weyl fermion; Fermi arc; topological insulator; nodal-line semimetal
资金
- Stanford Energy 3.0
- National Thousand Young Talents Program
- National Natural Science Foundation of China
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- Function Accelerated nano-Material Engineering, a Semiconductor Research Corporation program - Microelectronics Advanced Research Corporation
- Defense Advanced Research Projects Agency
Recognized as elementary particles in the standard model, Weyl fermions in condensed matter have received growing attention. However, most of the previously reported Weyl semimetals exhibit rather complicated electronic structures that, in turn, may have raised questions regarding the underlying physics. Here, we report promising topological phases that can be realized in specific honeycomb lattices, including ideal Weyl semimetal structures, 3D strong topological insulators, and nodal-line semimetal configurations. In particular, we highlight a semimetal featuring both Weyl nodes and nodal lines. Guided by this model, we showed that GdSI, the long-perceived ideal Weyl semimetal, has two pairs of Weyl nodes residing at the Fermi level and that LuSI (YSI) is a 3D strong topological insulator with the right-handed helical surface states. Our work provides a mechanism to study topological semimetals and proposes a platform for exploring the physics of Weyl semimetals as well as related device designs.
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