Disorder-Induced Stabilization of the Pseudogap in Strongly Correlated Systems

TL;DR

This paper investigates how strong disorder stabilizes the pseudogap in strongly correlated systems, revealing a robust zero-energy anomaly through non-perturbative numerical methods, and compares it to other pseudogap phenomena.

Contribution

It demonstrates disorder-induced stabilization of the pseudogap in the Anderson-Hubbard model using advanced numerical techniques, highlighting its robustness and unique features.

Findings

Identification of a robust zero-energy anomaly

Disorder stabilizes the pseudogap in strongly correlated systems

Comparison with other pseudogap mechanisms

Abstract

The interplay of strong interaction and strong disorder, as contained in the Anderson-Hubbard model, is addressed using two non-perturbative numerical methods: the Lanczos algorithm in the grand canonical ensemble at zero temperature and Quantum Monte Carlo. We find distinctive evidence for a zero-energy anomaly which is robust upon variation of doping, disorder and interaction strength. Its similarities to, and differences from, pseudogap formation in other contexts, including perturbative treatments of interactions and disorder, classical theories of localized charges, and in the clean Hubbard model, are discussed.