The electronic and transport properties in the Haldane-Hubbard with odd-parity altermagnetism

Abstract: The sublattice current is recently proposed as a feasible scheme to realize the odd-parity altermagnetism(ALM) by breaking the nonmagnetic time reversal symmetry. We first adopt the spin group method to analyze why the broken nonmagnetic time reversal symmetry(TRS) is the sufficient condition for the odd-parity ALM, and find that it is the symmetry $[\bar{C}2||\bar{E}]$ that allows the appearance of the odd-parity ALM where $\bar{C}_2$ represents a $180^\circ$ rotation around an axis perpendicular to the spins combined with the spin-space inversion, and $\bar{E}$ is the inversion in real space. As a representative example with the presence of sublattice currents, the optical conductivity of Haldane-Hubbard model is further studied using the Kubo formula. It is shown that there is no spin-polarized electrical current in both the longitudinal and traverse directions because of TRS in the odd-parity ALM, and they display a significant peak in the vicinity of the single-particle direct energy gap which reflects that both the longitudinal and traverse optical conductivities are dominated by the quasiparticle excitations around the Dirac points. We also study the hole doping dependence of the anomalous Hall conductivity $\sigma{\rm Hall}$ as well as the staggered magnetization $M$, and find that they display opposite behaviors, i.e., $\sigma_{\rm Hall}$ in the ALM CI state is diminished monotonically from its initial value $C=2$ at half-filling as the hole doping is increased, while in the ALMI state exhibits a non-monotonous behavior.