Dynamical Cluster Approximation for Disordered Systems with Rashba Spin-Orbit Coupling

Abstract: We present an extension of the dynamical cluster approximation (DCA) that incorporates Rashba spin-orbit coupling (SOC) to investigate the interplay between disorder and SOC on a two-dimensional square lattice. By analyzing the average density of states and the self energy, we demonstrate how Rashba SOC modifies single-particle properties in the presence of nonlocal spatial correlations captured by DCA. The return probability exhibits signatures of SOC induced delocalization at finite times. To assess the accuracy of our approach, we benchmark the DCA results against those obtained from the numerically exact kernel polynomial method. The good agreement between the two methods validates the use of the computationally efficient, mean-field-based DCA framework for studying disordered systems with SOC.