METRICA, l’archivio istituzionale della produzione scientifica dell’Istituto Nazionale di Ricerca Metrologica, ha lo scopo di raccogliere, documentare, conservare e pubblicare, anche ad accesso aperto, i prodotti della ricerca dell’Ente.
METRICA utilizza la piattaforma IRIS (Institutional Research Information System) sviluppata da Cineca.
EnglishWe 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.
BCS-BEC crossover in a two-dimensional Fermi gas / Bertaina, G; Giorgini, S. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 106:11(2011), p. 110403. [10.1103/PhysRevLett.106.110403]
| Titolo: | BCS-BEC crossover in a two-dimensional Fermi gas | |
| Autori: | ||
| Data di pubblicazione: | 2011 | |
| Rivista: | PHYSICAL REVIEW LETTERS | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevLett.106.110403 | |
| 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. | |
| Full-text (pubblici): | restricted | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| Bertaina_Giorgini_2011_BCS-BEC Crossover in a Two-Dimensional Fermi Gas.pdf | Versione editoriale | Non Pubblico - Accesso privato/ristretto | Utenti riconosciuti Richiedi una copia |
http://hdl.handle.net/11696/60885
Copyright © 2021