Reliable Equation of State for Composite Bosons in the 2D BCS-BEC Crossover

Year: 2016

Authors: Salasnich L.,

Autors Affiliation: Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Padua, Italy; INO CNR, Sez Sesto Fiorentino, Sesto Fiorentino, Italy.

Abstract: We briefly discuss recent experiments on the BCS-BEC crossover with ultracold alkali-metal atoms both in three-dimensional configurations and two-dimensional ones. Then we analyze the quantum-field-theory formalism used to describe an attractive D-dimensional Fermi gas taking into account Gaussian fluctuations. Finally, we apply this formalism to obtain a reliable equation of state of the 2D system at low temperaratures in the BEC regime of the crossover by performing a meaningful dimensional regularization of the divergent zero-point energy of collective bosonic excitations.

Journal/Review: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM

Volume: 29 (3)      Pages from: 597  to: 700

KeyWords: BCS-BEC crossover; Ultracold atoms; Dimensional regularization
DOI: 10.1007/s10948-015-3290-4

Citations: 1
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