July 17, 2025 Dataset Open Access

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

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  <identifier identifierType="DOI">10.25592/uhhfdm.17952</identifier>
  <creators>
    <creator>
      <creatorName>Titvinidze, Irakli</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-9456-3570</nameIdentifier>
      <affiliation>Universität Hamburg</affiliation>
    </creator>
    <creator>
      <creatorName>Stobbe, Julian</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-5228-7993</nameIdentifier>
      <affiliation>Universität Hamburg</affiliation>
    </creator>
    <creator>
      <creatorName>Leusch, Marvin</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0009-0001-1324-8692</nameIdentifier>
      <affiliation>Universität Hamburg</affiliation>
    </creator>
    <creator>
      <creatorName>Rohringer, Georg</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-4499-6693</nameIdentifier>
      <affiliation>King's College London</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Suppression of the charge fluctuations by nonlocal correlations close to the Mott transition</title>
  </titles>
  <publisher>Universität Hamburg</publisher>
  <publicationYear>2025</publicationYear>
  <dates>
    <date dateType="Issued">2025-07-17</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Dataset"/>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://www.fdr.uni-hamburg.de/record/17952</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsPartOf">10.25592/uhhfdm.17951</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;In this paper, we investigate the impact of nonlocal correlations on charge fluctuations in the&lt;br&gt;
two-dimensional single-band Hubbard model close to the Mott metal-to-insulator transition, em-&lt;br&gt;
ploying the ladder dynamical vertex approximation. At half-filling and for interaction strengths and&lt;br&gt;
temperatures where the system is in the Mott insulating phase, charge fluctuations are strongly&lt;br&gt;
suppressed. Under these conditions, dynamical mean-field theory (DMFT) calculations predict a&lt;br&gt;
strong enhancement of the charge susceptibility at small (electron or hole) doping. However, these&lt;br&gt;
DMFT results include only the effects of purely local correlations despite the importance of nonlo-&lt;br&gt;
cal correlations in two-dimensional systems. We have, hence, carried out ladder dynamical vertex&lt;br&gt;
approximation (lD&amp;Gamma;A) simulations which allow for the inclusion of such nonlocal correlation effects&lt;br&gt;
while retaining the local ones of DMFT. Our lD&amp;Gamma;A numerical data show that close to half-filling&lt;br&gt;
the large uniform charge susceptibility of DMFT is strongly suppressed by nonlocal fluctuations but&lt;br&gt;
gradually increases with (electron) doping. At a certain doping value, charge fluctuations eventually&lt;br&gt;
become larger in lD&amp;Gamma;A with respect to DMFT indicating that the absence of nonlocal correlations&lt;br&gt;
underestimates the mobility of the charge carriers in this parameter regime. This metallization effect&lt;br&gt;
is also reflected in an enhancement of the lD&amp;Gamma;A kinetic and potential energies and a corresponding&lt;br&gt;
reduction of the (absolute value of the) lD&amp;Gamma;A Matsubara self-energy with respect to DMFT.&lt;/p&gt;</description>
  </descriptions>
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