BCS-BEC crossover in a two-dimensional Fermi gas
We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluidity to Bose-Einstein condensation (BEC) in a two-dimensional Fermi gas at T=0 using the fixed-node diffusion Monte Carlo method. We calculate the equation of state and the gap parameter as a function of the interaction stren...
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| Veröffentlicht in: | Physical review letters 2011-03, Vol.106 (11), p.110403-110403, Article 110403 |
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| container_title | Physical review letters |
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| creator | Bertaina, G Giorgini, S |
| description | We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluidity to Bose-Einstein condensation (BEC) in a two-dimensional Fermi gas at T=0 using the fixed-node diffusion Monte Carlo method. We calculate the equation of state and the gap parameter as a function of the interaction strength, observing large deviations compared to mean-field predictions. In the BEC regime our results show the important role of dimer-dimer and atom-dimer interaction effects that are completely neglected in the mean-field picture. Results on Tan's contact parameter associated with short-range physics are also reported along the BCS-BEC crossover. |
| doi_str_mv | 10.1103/PhysRevLett.106.110403 |
| format | Article |
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We calculate the equation of state and the gap parameter as a function of the interaction strength, observing large deviations compared to mean-field predictions. In the BEC regime our results show the important role of dimer-dimer and atom-dimer interaction effects that are completely neglected in the mean-field picture. Results on Tan's contact parameter associated with short-range physics are also reported along the BCS-BEC crossover.</description><identifier>ISSN: 0031-9007</identifier><identifier>EISSN: 1079-7114</identifier><identifier>DOI: 10.1103/PhysRevLett.106.110403</identifier><identifier>PMID: 21469845</identifier><language>eng</language><publisher>United States</publisher><subject>BCS THEORY ; BOSE-EINSTEIN CONDENSATION ; CALCULATION METHODS ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; DIFFUSION ; DIMERS ; EQUATIONS ; EQUATIONS OF STATE ; FERMI GAS ; INTERACTIONS ; MEAN-FIELD THEORY ; MONTE CARLO METHOD ; NITRIDES ; NITROGEN COMPOUNDS ; PNICTIDES ; REFRACTORY METAL COMPOUNDS ; SUPERFLUIDITY ; TANTALUM COMPOUNDS ; TANTALUM NITRIDES ; TRANSITION ELEMENT COMPOUNDS ; TWO-DIMENSIONAL CALCULATIONS</subject><ispartof>Physical review letters, 2011-03, Vol.106 (11), p.110403-110403, Article 110403</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c391t-652740b6372a6390ed393ffcb29b377af8c7410b195375ccb429e922ff4e88c83</citedby><cites>FETCH-LOGICAL-c391t-652740b6372a6390ed393ffcb29b377af8c7410b195375ccb429e922ff4e88c83</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,2876,2877,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/21469845$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/21562094$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Bertaina, G</creatorcontrib><creatorcontrib>Giorgini, S</creatorcontrib><title>BCS-BEC crossover in a two-dimensional Fermi gas</title><title>Physical review letters</title><addtitle>Phys Rev Lett</addtitle><description>We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluidity to Bose-Einstein condensation (BEC) in a two-dimensional Fermi gas at T=0 using the fixed-node diffusion Monte Carlo method. We calculate the equation of state and the gap parameter as a function of the interaction strength, observing large deviations compared to mean-field predictions. In the BEC regime our results show the important role of dimer-dimer and atom-dimer interaction effects that are completely neglected in the mean-field picture. Results on Tan's contact parameter associated with short-range physics are also reported along the BCS-BEC crossover.</description><subject>BCS THEORY</subject><subject>BOSE-EINSTEIN CONDENSATION</subject><subject>CALCULATION METHODS</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>DIFFUSION</subject><subject>DIMERS</subject><subject>EQUATIONS</subject><subject>EQUATIONS OF STATE</subject><subject>FERMI GAS</subject><subject>INTERACTIONS</subject><subject>MEAN-FIELD THEORY</subject><subject>MONTE CARLO METHOD</subject><subject>NITRIDES</subject><subject>NITROGEN COMPOUNDS</subject><subject>PNICTIDES</subject><subject>REFRACTORY METAL COMPOUNDS</subject><subject>SUPERFLUIDITY</subject><subject>TANTALUM COMPOUNDS</subject><subject>TANTALUM NITRIDES</subject><subject>TRANSITION ELEMENT COMPOUNDS</subject><subject>TWO-DIMENSIONAL CALCULATIONS</subject><issn>0031-9007</issn><issn>1079-7114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNpNkF1LwzAUhoMobk7_wih44VXnyUeT5tKNTYWB4sd1SLPURdpmNtlk_97Oqnh14OV5z-E8CI0xTDAGev243ocnu1vaGCcY-CFkQI_QEIOQqcCYHaMhAMWpBBADdBbCOwBgwvNTNCCYcZmzbIhgOntOp_NZYlofgt_ZNnFNopP46dOVq20TnG90lSxsW7vkTYdzdFLqKtiLnzlCr4v5y-wuXT7c3s9ulqmhEseUZ0QwKDgVRHMqwa6opGVpCiILKoQucyMYhgLLjIrMmIIRaSUhZclsnpucjtBlv9eH6FQwLlqzNr5prImK4IwTkKyjrnpq0_qPrQ1R1S4YW1W6sX4bVM4xAQpZ1pG8J78fbW2pNq2rdbtXGNRBqfqntMu46pV2xfHPiW1R29Vf7dch_QLoJnHj</recordid><startdate>20110318</startdate><enddate>20110318</enddate><creator>Bertaina, G</creator><creator>Giorgini, S</creator><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>OTOTI</scope></search><sort><creationdate>20110318</creationdate><title>BCS-BEC crossover in a two-dimensional Fermi gas</title><author>Bertaina, G ; Giorgini, S</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c391t-652740b6372a6390ed393ffcb29b377af8c7410b195375ccb429e922ff4e88c83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>BCS THEORY</topic><topic>BOSE-EINSTEIN CONDENSATION</topic><topic>CALCULATION METHODS</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>DIFFUSION</topic><topic>DIMERS</topic><topic>EQUATIONS</topic><topic>EQUATIONS OF STATE</topic><topic>FERMI GAS</topic><topic>INTERACTIONS</topic><topic>MEAN-FIELD THEORY</topic><topic>MONTE CARLO METHOD</topic><topic>NITRIDES</topic><topic>NITROGEN COMPOUNDS</topic><topic>PNICTIDES</topic><topic>REFRACTORY METAL COMPOUNDS</topic><topic>SUPERFLUIDITY</topic><topic>TANTALUM COMPOUNDS</topic><topic>TANTALUM NITRIDES</topic><topic>TRANSITION ELEMENT COMPOUNDS</topic><topic>TWO-DIMENSIONAL CALCULATIONS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bertaina, G</creatorcontrib><creatorcontrib>Giorgini, S</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>OSTI.GOV</collection><jtitle>Physical review letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bertaina, G</au><au>Giorgini, S</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>BCS-BEC crossover in a two-dimensional Fermi gas</atitle><jtitle>Physical review letters</jtitle><addtitle>Phys Rev Lett</addtitle><date>2011-03-18</date><risdate>2011</risdate><volume>106</volume><issue>11</issue><spage>110403</spage><epage>110403</epage><pages>110403-110403</pages><artnum>110403</artnum><issn>0031-9007</issn><eissn>1079-7114</eissn><abstract>We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluidity to Bose-Einstein condensation (BEC) in a two-dimensional Fermi gas at T=0 using the fixed-node diffusion Monte Carlo method. We calculate the equation of state and the gap parameter as a function of the interaction strength, observing large deviations compared to mean-field predictions. In the BEC regime our results show the important role of dimer-dimer and atom-dimer interaction effects that are completely neglected in the mean-field picture. Results on Tan's contact parameter associated with short-range physics are also reported along the BCS-BEC crossover.</abstract><cop>United States</cop><pmid>21469845</pmid><doi>10.1103/PhysRevLett.106.110403</doi><tpages>1</tpages></addata></record> |
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| ispartof | Physical review letters, 2011-03, Vol.106 (11), p.110403-110403, Article 110403 |
| issn | 0031-9007 1079-7114 |
| language | eng |
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| source | American Physical Society Journals |
| subjects | BCS THEORY BOSE-EINSTEIN CONDENSATION CALCULATION METHODS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DIFFUSION DIMERS EQUATIONS EQUATIONS OF STATE FERMI GAS INTERACTIONS MEAN-FIELD THEORY MONTE CARLO METHOD NITRIDES NITROGEN COMPOUNDS PNICTIDES REFRACTORY METAL COMPOUNDS SUPERFLUIDITY TANTALUM COMPOUNDS TANTALUM NITRIDES TRANSITION ELEMENT COMPOUNDS TWO-DIMENSIONAL CALCULATIONS |
| title | BCS-BEC crossover in a two-dimensional Fermi gas |
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