Density correlations in ultracold atomic Fermi gases

Belzig, Wolfgang; Schroll, Christian; Bruder, Christoph

Density correlations in ultracold atomic Fermi gases

Dateien

PhysRevA_75_063611.pdfGröße: 122.51 KBDownloads: 425

Datum

2007

Autor:innen

Belzig, Wolfgang

Schroll, Christian

Bruder, Christoph

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Physical Review. 2007, 75, pp. 1-5. ISSN 1050-2947. eISSN 1094-1622. Available under: doi: 10.1063/1.2036873

Zusammenfassung

We investigate density fluctuations in a coherent ensemble of interacting fermionic atoms. Adapting the concept of full counting statistics, well known from quantum optics and mesoscopic electron transport, we study second-order as well as higher-order correlators of density fluctuations. Using the mean-field BCS state to describe the whole interval between the BCS limit and the Bose-Einstein condensate (BEC) limit, we obtain an exact expression for the cumulant-generating function of the density fluctuations of an atomic cloud. In the two-dimensional case, we obtain a closed analytical expression. Poissonian fluctuations of a molecular condensate on the BEC side are strongly suppressed on the BCS side. The size of the fluctuations in the BCS limit is a direct measure of the pairing potential. We also discuss the BEC-BCS crossover of the third cumulant and the temperature dependence of the second cumulant.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

BELZIG, Wolfgang, Christian SCHROLL, Christoph BRUDER, 2007. Density correlations in ultracold atomic Fermi gases. In: Physical Review. 2007, 75, pp. 1-5. ISSN 1050-2947. eISSN 1094-1622. Available under: doi: 10.1063/1.2036873

BibTex

@article{Belzig2007Densi-4998,
  year={2007},
  doi={10.1063/1.2036873},
  title={Density correlations in ultracold atomic Fermi gases},
  volume={75},
  issn={1050-2947},
  journal={Physical Review},
  pages={1--5},
  author={Belzig, Wolfgang and Schroll, Christian and Bruder, Christoph},
  note={Article Number: 63611}
}

RDF

<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/4998">
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T14:52:23Z</dcterms:available>
    <dc:contributor>Belzig, Wolfgang</dc:contributor>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dc:creator>Belzig, Wolfgang</dc:creator>
    <dc:creator>Bruder, Christoph</dc:creator>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dc:contributor>Bruder, Christoph</dc:contributor>
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/4998"/>
    <dcterms:abstract xml:lang="eng">We investigate density fluctuations in a coherent ensemble of interacting fermionic atoms. Adapting the concept of full counting statistics, well known from quantum optics and mesoscopic electron transport, we study second-order as well as higher-order correlators of density fluctuations. Using the mean-field BCS state to describe the whole interval between the BCS limit and the Bose-Einstein condensate (BEC) limit, we obtain an exact expression for the cumulant-generating function of the density fluctuations of an atomic cloud. In the two-dimensional case, we obtain a closed analytical expression. Poissonian fluctuations of a molecular condensate on the BEC side are strongly suppressed on the BCS side. The size of the fluctuations in the BCS limit is a direct measure of the pairing potential. We also discuss the BEC-BCS crossover of the third cumulant and the temperature dependence of the second cumulant.</dcterms:abstract>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dc:format>application/pdf</dc:format>
    <dc:contributor>Schroll, Christian</dc:contributor>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/4998/1/PhysRevA_75_063611.pdf"/>
    <dcterms:bibliographicCitation>First publ. in: Physical Review A 75 (2007), pp. 1-5</dcterms:bibliographicCitation>
    <dcterms:issued>2007</dcterms:issued>
    <dc:language>eng</dc:language>
    <dc:creator>Schroll, Christian</dc:creator>
    <dcterms:title>Density correlations in ultracold atomic Fermi gases</dcterms:title>
    <dc:rights>Attribution-NonCommercial-NoDerivs 2.0 Generic</dc:rights>
    <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by-nc-nd/2.0/"/>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/4998/1/PhysRevA_75_063611.pdf"/>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T14:52:23Z</dc:date>
  </rdf:Description>
</rdf:RDF>

Universitätsbibliographie

Ja