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Title: New classes of topological crystalline insulators having surface rotation anomaly

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Songshan Lake Materials Lab., Dongguan (China);; Chinese Academy of Sciences (CAS), Beijing (China). Kavli Institute for Theoretical Sciences
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics

We discover new types of quantum anomalies in two-dimensional systems with time-reversal symmetry (T) and discrete rotation symmetry with order of n = 2, 4, and 6 (Cn). The new anomalous states have n flavors of massless Dirac fermions protected by T and Cn, whereas any two-dimensional lattices having the two symmetries must have a multiple of 4, 8, and 12 Dirac cones for n = 2, 4, and 6, respectively. We show that these anomalous states are physically realized on the surface of new classes of topological crystalline insulators, normal to the rotation axis. Moreover, these topological crystalline insulators support n gapless one-dimensional helical mode on the otherwise fully gapped side surface, connecting the anomalous two-dimensional states on the top and bottom surfaces. The presence of these helical modes enables a new quantum device made from a topological crystalline insulator nanorod, a “helical nanorod,” which has a quantized longitudinal conductance of ne2/h.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; NSFC
Grant/Contract Number:
SC0010526; 2016YFA0302400; 11674370
OSTI ID:
1625991
Journal Information:
Science Advances, Vol. 5, Issue 12; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 82 works
Citation information provided by
Web of Science

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Cited By (6)

Strong and fragile topological Dirac semimetals with higher-order Fermi arcs journal January 2020
Appearance of hinge states in second-order topological insulators via the cutting procedure journal March 2020
Bulk-edge and bulk-hinge correspondence in inversion-symmetric insulators journal March 2020
Strong and fragile topological Dirac semimetals with higher-order Fermi arcs text January 2020
Strong and Fragile Topological Dirac Semimetals with Higher-Order Fermi Arcs text January 2019
Appearance of hinge states in second-order topological insulators via the cutting procedure text January 2019

Figures / Tables (4)


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