Symmetry protected topological orders and the group cohomology of their symmetry group
Xie Chen, Zheng-Cheng Gu, Zheng-Xin Liu, and Xiao-Gang Wen
A short version published in Science338 1604-1606 (2012)
Introduced group cohomology theory into condensed matter physics to describe
short-range entangled phases with symmetry for interacting bosons.
Emergence of helicity +/- 2 modes (gravitons) from qubit models
Zheng-Cheng Gu and Xiao-Gang Wen Nuclear Physics B 863, 90 (2012)
Constructed two quantum spin models on a lattice which gives rise to emergent
gravitons (one with ω = k and the other with ω = k^3 dispersion).
Photons and electrons as emergent phenomena
Michael A. Levin and Xiao-Gang Wen Rev. Mod. Phys.77, 871-879 (2005),
String-net condensation provides a way to unify light and electrons.
String-net condensation: A physical mechanism for topological phases
Michael Levin and Xiao-Gang Wen Phys. Rev. B71, 045110 (2005).
Introduced tensor category theory into condensed matter physics to describe
long-range entangled phases (ie topologically ordered phases) for interacting