Extended topological group structure due to average reflection symmetry

Symmetry protected topological orders and the group cohomology of their symmetry group

Xie Chen,1,2 Zheng-Cheng Gu,3,4 Zheng-Xin Liu,5,2 and Xiao-Gang Wen6,2,5 1Department of Physics, University of California, Berkeley, California 94720, USA 2Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 3Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA 4Department of Physics, Cali...

A Reflection on Kristeva's Approach to the Structure of Language

Reaching out to history and subject in terms of meaning variation, Kristeva could show that language cannot simply be a Saussurean sign system. Rather, she went on to delineate that language, beyond signs, is associated with a dynamic system of signification where the ''speaking subject'' is constantly involved in processing. Julia Kristeva, a French critic, psychoanalyst, theoretician, a post-...

Multi-Weyl topological semimetals stabilized by point group symmetry.

We perform a complete classification of two-band k·p theories at band crossing points in 3D semimetals with n-fold rotation symmetry and broken time-reversal symmetry. Using this classification, we show the existence of new 3D topological semimetals characterized by C(4,6)-protected double-Weyl nodes with quadratic in-plane (along k(x,y)) dispersion or C(6)-protected triple-Weyl nodes with cubi...

The Structure of Electroweak Corrections Due to Extended Gauge Symmetries

This paper studies models with extended electroweak gauge sectors of the form SU(2) × SU(2) × U(1) × [SU(2) or U(1)]. We establish the general behavior of corrections to precision electroweak observables in this class of theories and connect our results to previous work on specific models whose electroweak sectors are special cases of our extended group. Address after 8-16-03: Department of Phy...

Reflection Symmetry Detection via Appearance of Structure Descriptor