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Title: BCS-BEC crossover in symmetric nuclear matter at finite temperature: Pairing fluctuation and pseudogap

Abstract

By adopting a T-matrix-based method within the G{sub 0}G approximation for the pair susceptibility, we studied the effects of pairing fluctuation on the BCS-BEC crossover in symmetric nuclear matter. The pairing fluctuation induces a pseudogap in the excitation spectrum of a nucleon in both superfluid and normal phases. The critical temperature of the superfluid transition was calculated. It differs from the BCS result remarkably when density is low. We also computed the specific heat, which shows a nearly ideal BEC-type temperature dependence at low density, but a BCS-type behavior at high density. This qualitative change of the temperature dependence of specific heat may serve as a thermodynamic signal for the BCS-BEC crossover.

Authors:
 [1]
  1. Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main (Germany)
Publication Date:
OSTI Identifier:
21386667
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 81; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.81.034007; (c) 2010 The American Physical Society; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; APPROXIMATIONS; BCS THEORY; BOSE-EINSTEIN CONDENSATION; CRITICAL TEMPERATURE; DENSITY; EXCITATION; FLUCTUATIONS; NUCLEAR MATTER; NUCLEONS; S MATRIX; SIMULATION; SPECIFIC HEAT; SPECTRA; SUPERFLUIDITY; SYMMETRY; TEMPERATURE DEPENDENCE; BARYONS; CALCULATION METHODS; ELEMENTARY PARTICLES; ENERGY-LEVEL TRANSITIONS; FERMIONS; HADRONS; MATRICES; MATTER; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE; VARIATIONS

Citation Formats

Xuguang, Huang, and Institut fuer Theoretische Physik, Goethe-Universitaet, D-60438 Frankfurt am Main. BCS-BEC crossover in symmetric nuclear matter at finite temperature: Pairing fluctuation and pseudogap. United States: N. p., 2010. Web. doi:10.1103/PHYSREVC.81.034007.
Xuguang, Huang, & Institut fuer Theoretische Physik, Goethe-Universitaet, D-60438 Frankfurt am Main. BCS-BEC crossover in symmetric nuclear matter at finite temperature: Pairing fluctuation and pseudogap. United States. https://doi.org/10.1103/PHYSREVC.81.034007
Xuguang, Huang, and Institut fuer Theoretische Physik, Goethe-Universitaet, D-60438 Frankfurt am Main. Mon . "BCS-BEC crossover in symmetric nuclear matter at finite temperature: Pairing fluctuation and pseudogap". United States. https://doi.org/10.1103/PHYSREVC.81.034007.
@article{osti_21386667,
title = {BCS-BEC crossover in symmetric nuclear matter at finite temperature: Pairing fluctuation and pseudogap},
author = {Xuguang, Huang and Institut fuer Theoretische Physik, Goethe-Universitaet, D-60438 Frankfurt am Main},
abstractNote = {By adopting a T-matrix-based method within the G{sub 0}G approximation for the pair susceptibility, we studied the effects of pairing fluctuation on the BCS-BEC crossover in symmetric nuclear matter. The pairing fluctuation induces a pseudogap in the excitation spectrum of a nucleon in both superfluid and normal phases. The critical temperature of the superfluid transition was calculated. It differs from the BCS result remarkably when density is low. We also computed the specific heat, which shows a nearly ideal BEC-type temperature dependence at low density, but a BCS-type behavior at high density. This qualitative change of the temperature dependence of specific heat may serve as a thermodynamic signal for the BCS-BEC crossover.},
doi = {10.1103/PHYSREVC.81.034007},
url = {https://www.osti.gov/biblio/21386667}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 81,
place = {United States},
year = {2010},
month = {3}
}