Strong local bosonic fluctuations: The key to understanding strongly correlated metals

Hassan, SR and Prakash, G and Vidhyadhiraja, NS and Ramakrishnan, TV (2024) Strong local bosonic fluctuations: The key to understanding strongly correlated metals. In: Physical Review B, 110 (7).

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Abstract

In this paper, we present a theoretical framework for understanding the extremely correlated Fermi liquid (ECFL) phenomenon within the U=� Hubbard model. Our approach involves deriving equations of motion for the single-particle Green's function G and its associated self-energy �, which involves the product of the bosonic correlation function comprising both density (DN) and spin (DS) correlations with G. By solving these equations self-consistently, we explore the behavior of G, DN, and DS as functions of frequency, temperature, and hole concentration. Our results reveal distinct coherent and incoherent Fermi liquid regimes characterized by the presence or absence of quasiparticle excitations. Additionally, we analyze the intrinsic dc resistivity �(T), observing a crossover from T2 to linear behavior with increasing temperature. Our findings delineate Fermi liquid, quantum incoherent, and "classical"regimes in strongly correlated systems, emphasizing the importance of quantum diffusive local charge and spin fluctuations. © 2024 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to the publisher.
Keywords:	Bosons; Equations of motion; Fermions; Hole concentration; Spin fluctuations, Correlation function; Density correlation; Equation of motion; Function of frequency; Greens function; Quasiparticles excitation; Self energy; Single-particle; Spin correlations; Theoretical framework, Fermi liquids
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	29 Aug 2024 10:47
Last Modified:	29 Aug 2024 10:47
URI:	http://eprints.iisc.ac.in/id/eprint/86007

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