2018/03/31 by Prosenjit Haldar, M. S. Laad, S. R. Hassan · 8 citations
Materials Science · Mathematics · Physics and Astronomy · #Condensed matter physics #Dielectric #Dielectric response #Material Dynamics and Properties #Mathematics #Physics #Quantum #Quantum mechanics #Realization (probability) #Spectroscopy and Quantum Chemical Studies #Statistical physics #Theoretical and Computational Physics #cond-mat.dis-nn #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.99.125147
published in Physical review. B./Physical review. B 99(12) (American Physical Society) · 9 pages, 6 figures
arxiv created 2019/03/19 · openalex publication_date 2019/03/26 · arxiv updated 2019/03/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A wide range of disordered materials, including disordered correlated systems, show universal dielectric response (UDR), followed by a superlinear power-law increase in their optical responses over exceptionally broad frequency regimes. While extensively used in various contexts over the years, the microscopics underpinning UDR remains controversial. Here, we investigate the optical response of the simplest model of correlated fermions, the Falicov-Kimball model, across the continuous metal-insulator transition (MIT) and analyze the associated quantum criticality in detail using cluster extension of dynamical mean-field theory. Surprisingly, we find that UDR naturally emerges in the quantum critical region associated with the continuous MIT. We tie the emergence of these novel features to a many-body orthogonality catastrophe accompanying the onset of strongly correlated electronic glassy dynamics close to the MIT, providing a microscopic realization of Jonscher's time-honored proposal as well as a rationale for similarities in optical responses between correlated electronic matter and canonical glass formers.