July 17, 2025 Dataset Open Access

Titvinidze, Irakli; Stobbe, Julian; Leusch, Marvin; Rohringer, Georg

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{"conceptdoi":"10.25592/uhhfdm.17951","conceptrecid":"17951","created":"2025-09-17T17:41:25.050437+00:00","doi":"10.25592/uhhfdm.17952","id":17952,"links":{"badge":"https://www.fdr.uni-hamburg.de/badge/doi/10.25592/uhhfdm.17952.svg","conceptbadge":"https://www.fdr.uni-hamburg.de/badge/doi/10.25592/uhhfdm.17951.svg","conceptdoi":"http://doi.org/10.25592/uhhfdm.17951","doi":"http://doi.org/10.25592/uhhfdm.17952"},"metadata":{"access_right":"open","access_right_category":"success","communities":[{"id":"uhh"}],"creators":[{"affiliation":"Universit\u00e4t Hamburg","name":"Titvinidze, Irakli","orcid":"0000-0002-9456-3570"},{"affiliation":"Universit\u00e4t Hamburg","name":"Stobbe, Julian","orcid":"0000-0002-5228-7993"},{"affiliation":"Universit\u00e4t Hamburg","name":"Leusch, Marvin","orcid":"0009-0001-1324-8692"},{"affiliation":"King's College London","name":"Rohringer, Georg","orcid":"0000-0002-4499-6693"}],"description":"<p>In this paper, we investigate the impact of nonlocal correlations on charge fluctuations in the<br>\ntwo-dimensional single-band Hubbard model close to the Mott metal-to-insulator transition, em-<br>\nploying the ladder dynamical vertex approximation. At half-filling and for interaction strengths and<br>\ntemperatures where the system is in the Mott insulating phase, charge fluctuations are strongly<br>\nsuppressed. Under these conditions, dynamical mean-field theory (DMFT) calculations predict a<br>\nstrong enhancement of the charge susceptibility at small (electron or hole) doping. However, these<br>\nDMFT results include only the effects of purely local correlations despite the importance of nonlo-<br>\ncal correlations in two-dimensional systems. We have, hence, carried out ladder dynamical vertex<br>\napproximation (lD&Gamma;A) simulations which allow for the inclusion of such nonlocal correlation effects<br>\nwhile retaining the local ones of DMFT. Our lD&Gamma;A numerical data show that close to half-filling<br>\nthe large uniform charge susceptibility of DMFT is strongly suppressed by nonlocal fluctuations but<br>\ngradually increases with (electron) doping. At a certain doping value, charge fluctuations eventually<br>\nbecome larger in lD&Gamma;A with respect to DMFT indicating that the absence of nonlocal correlations<br>\nunderestimates the mobility of the charge carriers in this parameter regime. This metallization effect<br>\nis also reflected in an enhancement of the lD&Gamma;A kinetic and potential energies and a corresponding<br>\nreduction of the (absolute value of the) lD&Gamma;A Matsubara self-energy with respect to DMFT.</p>","doi":"10.25592/uhhfdm.17952","language":"eng","license":{"id":"CC-BY-4.0"},"publication_date":"2025-07-17","related_identifiers":[{"identifier":"10.25592/uhhfdm.17951","relation":"isVersionOf","scheme":"doi"}],"relations":{"version":[{"count":1,"index":0,"is_last":true,"last_child":{"pid_type":"recid","pid_value":"17952"},"parent":{"pid_type":"recid","pid_value":"17951"}}]},"resource_type":{"title":"Dataset","type":"dataset"},"title":"Suppression of the charge fluctuations by nonlocal correlations close to the Mott transition"},"owners":[848],"revision":2,"updated":"2025-09-19T09:04:01.845766+00:00"}