Understanding disorder-induced zero-bias anomalies in systems with short-range interactions: An atomic-limit perspective

Motivated by the novel electronic behaviors seen in transition-metal oxides, we look for physical insight into disordered, strongly correlated systems by exploring the atomic limit. In recent work, the atomic limit has provided a useful reference point in systems with strong local interactions. For comparison with experiments, the exploration of nonlocal interactions is of interest. In the atomic limit, both the case of on-site interactions alone and the case of infinite-range (1/r) interactions are well understood; however, not so the intervening possibilities. Here we study the atomic limit of the extended Anderson-Hubbard model using classical Monte Carlo to calculate the single-particle density of states. We show that the combination of nearest-neighbor interactions and site disorder produces a zero-bias anomaly caused by residual charge ordering, and the addition of on-site interactions has a nonmonotonic effect on the depth of this zero-bias anomaly. A key conclusion is that the form of the density of states in this classical system strongly resembles density of states results obtained for the full extended Anderson-Hubbard model whenU < 4V