Relativistic description of BCS-BEC crossover in nuclear matter

doi:10.1016/j.physletb.2009.11.065

	Relativistic description of BCS-BEC crossover in nuclear matter
	Sun, Bao Yuan 2,3,4; Toki, Hiroshi 2,3,4; Meng, Jie 1,2,3,5,6,7
刊名	PHYSICS LETTERS B
	2010-01-18
卷号	683 页码:134-139
关键词	Pairing correlation Nuclear matter Relativistic pairing theory Bare nucleon-nucleon interaction Di-neutron spatial correlation BCS-BEC crossover
ISSN号	0370-2693
DOI	10.1016/j.physletb.2009.11.065
英文摘要	We study theoretically the di-neutron spatial correlations and the crossover from superfluidity of neutron Cooper pairs in the (1)S(0) pairing channel to Bose-Einstein condensation (BEC) of di-neutron pairs for both symmetric and neutron matter in the microscopic relativistic pairing theory. We take the bare nucleon-nucleon interaction Bonn-B in the particle-particle channel and the effective interaction PK1 of the relativistic mean-field approach in the particle-hole channel. It is found that the spatial structure of neutron Cooper pair wave function evolves continuously from BCS-type to BEC-type as density decreases. We see a strong concentration of the probability density revealed for the neutron pairs in the fairly small relative distance around 1.5 fm and the neutron Fermi momentum k(Fn) is an element of [0.6, 1.0] fm(-1). However, from the effective chemical potential and the quasiparticle excitation spectrum, there is no evidence for the appearance of a true BEC state of neutron pairs at any density. The most BEC-like state may appear at k(Fn) - 0.2 fm(-1) by examining the density correlation function. From the coherence length and the probability distribution of neutron Cooper pairs as well as the ratio between the neutron pairing gap and the kinetic energy at the Fermi surface, some features of the BCS-BEC crossover are seen in the density regions, 0.05 fm(-1) < k(Fn) < 0.7 (0.75) fm(-1), for the symmetric nuclear (pure neutron) matter. (C) 2009 Elsevier B.V. All rights reserved.
资助项目	Major State Basic Research Development Program[2007CB815000] ; National Natural Science Foundation of China[10975008 and 10775004]
WOS关键词	MEAN-FIELD THEORY ; NEUTRON DRIP-LINE ; STATE PROPERTIES ; HALO ; LI-11 ; SUPERCONDUCTIVITY ; SUPERFLUIDITY ; HE-6 ; PAIR
WOS研究方向	Physics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000274421100010
资助机构	Major State Basic Research Development Program ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/33101]
专题	中国科学院近代物理研究所
通讯作者	Meng, Jie
作者单位	1.Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China 2.Peking Univ, Sch Phys, Beijing 100871, Peoples R China 3.Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China 4.Osaka Univ, RCNP, Osaka 5670047, Japan 5.Univ Stellenbosch, Dept Phys, ZA-7600 Stellenbosch, South Africa 6.Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China 7.Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Sun, Bao Yuan,Toki, Hiroshi,Meng, Jie. Relativistic description of BCS-BEC crossover in nuclear matter[J]. PHYSICS LETTERS B,2010,683:134-139.
APA	Sun, Bao Yuan,Toki, Hiroshi,&Meng, Jie.(2010).Relativistic description of BCS-BEC crossover in nuclear matter.PHYSICS LETTERS B,683,134-139.
MLA	Sun, Bao Yuan,et al."Relativistic description of BCS-BEC crossover in nuclear matter".PHYSICS LETTERS B 683(2010):134-139.