Anomalous Crystal Symmetry Fractionalization on the Surface of Topological Crystalline Insulators
- Tsinghua Univ., Beijing (China). Inst. for Advanced Study; Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
The surface of a three-dimensional topological electron system often hosts symmetry-protected gapless surface states. With the effect of electron interactions, these surface states can be gapped out without symmetry breaking by a surface topological order, in which the anyon excitations carry anomalous symmetry fractionalization that cannot be realized in a genuine two-dimensional system. We show here that for a mirror-symmetry-protected topological crystalline insulator with mirror Chern number $n=4$, its surface can be gapped out by an anomalous $${\mathbb{Z}}_{2}$$ topological order, where all anyons carry mirror-symmetry fractionalization $${M}^{2}={-}1$$. The identification of such anomalous crystalline symmetry fractionalization implies that in a two-dimensional $${\mathbb{Z}}_{2}$$ spin liquid, the vison excitation cannot carry $${M}^{2}={-}1$$ if the spinon carries $${M}^{2}={-}1$$ or a half-integer spin.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Tsinghua Univ., Beijing (China)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Basic Research Program of China; National Natural Science Foundation of China (NSFC)
- Grant/Contract Number:
- SC0010526; 2011CBA00108; 11104154
- OSTI ID:
- 1505737
- Alternate ID(s):
- OSTI ID: 1227745
- Journal Information:
- Physical Review Letters, Vol. 115, Issue 23; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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