Three-dimensional Dirac semimetals can be driven into an insulating state by coupling to a
charge density wave (CDW) order. Here, we consider the quantized crystalline responses of …

We present a theory unifying the topological responses and anomalies of various gapless
fermion systems exhibiting Fermi surfaces, including those with Berry phases, and nodal …

Topological phases of quantum matter have been at the forefront of physics research for the
past forty years, ever since the observation of the integer quantum Hall effect (IQHE) and …