Role of time reversal symmetry and tilting in circular photogalvanic responses

We study the role of time reversal symmetry (TRS) in circular photogalvanic (CPG) responses considering chiral Weyl semimetal (WSM) while a quantized CPG response is guaranteed by broken both inversion (IS) and mirror symmetries. The TRS WSM yields one left right nodes (WNs) there are two WNs for invariant WSM. show that these features can potentially cause quantization at higher values compared to topological charge underlying This further supported fact Berry curvature velocity behave differently whether system preserves or breaks TRS. find type-II be four times activated chemical potential respectively chosen vicinity energies associated with WNs. By contrast, irrespective above choice potential, directly given case. Interestingly, we notice non-quantized peak when opposite chiralities close each other as it case type-I considered here. Moreover, tilt significantly modify direction changes which enters into tensor through Fermi distribution function. Given exciting outcomes, second order emerges useful indicator characterize under consideration. Furthermore, investigate momentum resolved structure relate final results strengthen our analysis from perspective lattice models.