244 citations · 450 across the 8 of their papers we have counts for
8 papers
Ground state degeneracy in quantum spin systems protected by crystal symmetries
Yang Qi, Chen Fang, Liang Fu
We develop a no-go theorem for two-dimensional bosonic systems with crystal symmetries: if there is a half-integer spin at a rotation center, where the point-group symmetry is $\ma…
Topological crystalline superconductors with linearly and projectively represented symmetry
Chen Fang, B. Andrei Bernevig, Matthew J. Gilbert
We study superconductors with -fold rotational invariance both in the presence and in the absence of spin-orbit interactions. More specifically, we classify the non-interacting…
Modular Anomalies in (2+1) and (3+1)-D Edge Theories
Moon Jip Park, Chen Fang, B. Andrei Bernevig +1
The classification of topological phases of matter in the presence of interactions is an area of intense interest. One possible means of classification is via studying the partitio…
Symmetry fractionalization of visons in spin liquids
Yang Qi, Meng Cheng, Chen Fang
In this work we study symmetry fractionalization of vison excitations in topological spin liquids. We show that in the presence of the full spin rot…
Parafermionic phases with symmetry-breaking and topological order
A. Alexandradinata, N. Regnault, Chen Fang +2
Parafermions are the simplest generalizations of Majorana fermions that realize topological order. We propose a less restrictive notion of topological order in 1D open chains, whic…
New classes of topological crystalline insulators with unpinned surface Dirac cones
Chen Fang, Liang Fu
We theoretically predict two new classes of three-dimensional topological crystalline insulators (TCIs), which have an odd number of unpinned surface Dirac cones protected by cryst…