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Universal dielectric response across a continuous metal-insulator transition

Haldar, Prosenjit and Laad, MS and Hassan, SR (2019) Universal dielectric response across a continuous metal-insulator transition. In: PHYSICAL REVIEW B, 99 (12).

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Official URL: https://doi.org/PhysRevB.99.125147


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.

Item Type: Journal Article
Additional Information: Copyright of this article is belongs to AMER PHYSICAL SOC
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 27 May 2019 07:27
Last Modified: 27 May 2019 07:27
URI: http://eprints.iisc.ac.in/id/eprint/62279

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