42 citations · 45 across the 5 of their papers we have counts for
6 papers
Projective representation theory of spin space groups
Zheng Zhang, Peiyuan Wang, Y. X. Zhao
Spin space groups provide the natural symmetry framework for magnetic crystals with weak spin-orbit coupling, but extracting their physical consequences requires a general theory o…
sft-wick: A formalism and package for Feynman-diagram expansion and evaluation in stochastic field theories
Zheng Zhang
When stochastic field dynamics are cast into a path-integral formulation, perturbation theory becomes systematic but the resulting expansion quickly grows combinatorially large. Th…
Statistical Field Theory for Weak Gravitational Lensing
Zheng Zhang, Philip Bull, Chris Clarkson +1
Standard weak-lensing calculations treat lensing as a linear remapping of the matter field along the line of sight. We instead formulate lensing as a stochastic field theory for th…
A Cohomological Framework for Topological Phases from Momentum-Space Crystallographic Groups
T. R. Liu, Zheng Zhang, Y. X. Zhao
Crystallographic groups are conventionally studied in real space to characterize crystal symmetries. Recent work has recognized that when these symmetries are realized projectively…
Projective Spacetime Symmetry of Spacetime Crystals
Zheng Zhang, Z. Y. Chen, Y. X. Zhao
Wigner's seminal work on the Poincaré group revealed one of the fundamental principles of quantum theory: symmetry groups are projectively represented. The condensed-matter counter…
Classification of time-reversal-invariant crystals with gauge structures
Z. Y. Chen, Zheng Zhang, Shengyuan A. Yang +1
A peculiar feature of quantum states is that they may embody so-called projective representations of symmetries rather than ordinary representations. Projective representations of…