Boson-induced s-wave pairing in dilute boson-fermion mixtures -: art. no. 023605

被引:56
作者
Viverit, L [1 ]
机构
[1] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
来源
PHYSICAL REVIEW A | 2002年 / 66卷 / 02期
关键词
D O I
10.1103/PhysRevA.66.023605
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We show that in dilute boson-fermion mixtures with fermions in two internal states, even when the bare fermion-fermion interaction is repulsive, the exchange of density fluctuations of the Bose condensate may lead to an effective fermion-fermion attraction, and thus to a Cooper instability in the s-wave channel. We give a simple condition to know when this is going to happen, and an analytic expression for the associated T-c in the most important limit where the phonon branch of the Bogoliubov excitation spectrum of the bosons is important. We find a T-c of the same order as for a pure Fermi gas with bare attraction.
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页数:5
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共 20 条
[1]   THERMAL AND MAGNETIC PROPERTIES OF DILUTE SOLUIONS OF HE3 IN HE4 AT LOW TEMPERATURES [J].
ANDERSON, AC ;
EDWARDS, DO ;
ROACH, WR ;
SARWINSKI, RE ;
WHEATLEY, JC .
PHYSICAL REVIEW LETTERS, 1966, 17 (07) :367-+
[2]   INTERACTIONS BETWEEN HE3 ATOMS IN DILUTE SOLUTIONS OF HE3 IN SUPERFLUID HE4 [J].
BARDEEN, J ;
BAYM, G ;
PINES, D .
PHYSICAL REVIEW LETTERS, 1966, 17 (07) :372-&
[3]  
BIJLSMA MJ, 2000, PHYS REV A, V61
[4]  
de Gennes P. G., 1966, SUPERCONDUCTIVITY ME
[5]   Pauli blocking of collisions in a quantum degenerate atomic Fermi gas [J].
DeMarco, B ;
Papp, SB ;
Jin, DS .
PHYSICAL REVIEW LETTERS, 2001, 86 (24) :5409-5412
[6]   Onset of Fermi degeneracy in a trapped atomic gas [J].
DeMarco, B ;
Jin, DS .
SCIENCE, 1999, 285 (5434) :1703-1706
[7]   SOLUBILITY OF HE3 IN LIQUID HE4 AT O DEGREE K [J].
EDWARDS, DO ;
BREWER, DF ;
SELIGMAN, P ;
SKERTIC, M ;
YAQUB, M .
PHYSICAL REVIEW LETTERS, 1965, 15 (20) :773-&
[8]   REACTION MATRIX SINGULARITIES AND THE ENERGY GAP IN AN INFINITE SYSTEM OF FERMIONS [J].
EMERY, VJ .
NUCLEAR PHYSICS, 1960, 19 (02) :154-163
[9]  
GORKOV LP, 1961, SOV PHYS JETP-USSR, V13, P1018
[10]   Influence of induced interactions on the superfluid transition in dilute Fermi gases [J].
Heiselberg, H ;
Pethick, CJ ;
Smith, H ;
Viverit, L .
PHYSICAL REVIEW LETTERS, 2000, 85 (12) :2418-2421