opposite wave
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2013 ◽  
Vol 27 (07) ◽  
pp. 1361007
Author(s):  
ZE CHENG

Within the framework of quantum field theory, we find that uniform Bose atomic gases with noncontact interaction can undergo a Bardeen–Cooper–Schrieffer (BCS) condensation below a critical temperature. In the BCS condensation state, bare atoms with opposite wave vectors are bound into pairs, and unpaired bare atoms are transformed into a new kind of quasi-particle, i.e., the dressed atom. The atom-pair system is a condensate or a superfluid and the dressed-atom system is a normal fluid. At absolute zero temperature the condensate possesses a lowest negative energy. The critical temperature and the effective mass of dressed atoms are derived analytically. The transition from the BCS condensation state to the normal state is a first-order phase transition.


2007 ◽  
Vol 364 (5) ◽  
pp. 421-424 ◽  
Author(s):  
M.Yu. Barabanenkov ◽  
Yu.N. Barabanenkov ◽  
Yu.V. Gulyaev ◽  
S.A. Nikitov

1986 ◽  
Vol 16 (3) ◽  
pp. 404-408
Author(s):  
D A Goryachkin ◽  
V P Kalinin ◽  
I M Kozlovskaya ◽  
I A Komin ◽  
N A Romanov ◽  
...  

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