We study the electronic structures of oxygen-deficient Ta2O5 by using first-principles calculations.Starting from the stable structure determined experimentally,we construct a model crystalline struct
Three-dimensional (3D) Dirac point,where two Weyl points overlap in momentum space,is usually unstable and hard to realize.Here we show,based on the first-principles calculations and effective model a
We investigate novel phases that emerge from the interplay of electron correlations and strong spin-orbit interactions.We focus on describing the topological semimetal,a three-dimensional phase of a m
In this paper,we present a narrow bandwidth source at the telecom wavelength based on type ⅡPPKTP crystal inside an optical cavity.Simultaneous resonances of the pump and the two down-converted fields