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Atypical BCS-BEC crossover induced by quantum-size effects

Title data

Shanenko, A. A. ; Croitoru, Mikhail D. ; Vagov, Alexei ; Axt, Vollrath M. ; Perali, A. ; Peeters, F. M.:
Atypical BCS-BEC crossover induced by quantum-size effects.
In: Physical Review A. Vol. 86 (2012) Issue 3 . - Art.Nr. 033612, 7 S..
ISSN 0556-2791
DOI: https://doi.org/10.1103/PhysRevA.86.033612

Project information

Project financing: Supported by the Flemish Science Foundation (FWO-Vl). EU Marie Curie IEF Action (Grant Agreement No. PIEF-GA-2009-235486-ScQSR). European Science Foundation,POLATOM Research Networking Programme, Ref. No. 4844, European Science Foundation, POLATOM Research Networking Programme, Ref. No. 5200.

Abstract in another language

Quantum-size oscillations of the basic physical characteristics of a confined fermionic condensate are a well-known phenomenon. Its conventional understanding is based on the single-particle physics, whereby the oscillations follow variations in the single-particle density of states driven by the size quantization. Here we present a study of a cigar-shaped ultracold superfluid Fermi gas, which demonstrates an important many-body aspect of the quantum-size coherent effects, overlooked previously. The many-body physics is revealed here in the atypical crossover from the Bardeen-Cooper-Schrieffer (BCS) superfluid to the Bose-Einstein condensate (BEC) induced by the size quantization of the particle motion. The single-particle energy spectrum for the transverse dimensions is tightly bound, whereas for the longitudinal direction it resembles a quasi-free dispersion. This results in the formation of a series of single-particle subbands (shells) so that the aggregate fermionic condensate becomes a coherent mixture of subband condensates. Each time when the lower edge of a subband crosses the chemical potential, the BCS-BEC crossover is approached in this subband, and the aggregate condensate contains both BCS and BEC-like components.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: superconductivity; quantum size-effects; BCS; BEC; Quantum-size oscillations; confined fermionic condensate
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 03 Nov 2017 06:51
Last Modified: 03 Nov 2017 06:51
URI: https://eref.uni-bayreuth.de/id/eprint/40247