2024/03/26 by Jiasong Chen, Chen, Jiasong
Physics and Astronomy · #FOS: Physical sciences #Quantum Mechanics and Non-Hermitian Physics #Quantum and electron transport phenomena #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2403.17586
openalex publication_date 2024/03/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A combined study of non-Hermitian physics and strong correlations can yield numerous intriguing effects. Authors of a previous study on the non-Hermitian Kondo model in the ultracold atoms reported the reversion of the renormalization group (RG) flow. In this paper, we investigate the non-Hermitian Kondo effect in the system with a specific form of density of states ρ(ω) ∼ |ω|r(r>0), known as the pseudogap system. We find that, for r<(1)/(2), our results from perturbative RG are consistent with those of the Hermitian pseudogap Kondo effect. For r=(1)/(2), a fixed point with the reversion property emerges in the RG flow. For r>(1)/(2), an unstable fixed point appears in the complex plane of the parameter space. Furthermore, through the large-N expansion, we validate the RG results for r < (1)/(2), finding that the self-consistent equations have non-trivial solutions in a specific region of the complex plane of the parameter space.