We study the phase structure of a dilute two-component Fermi system with attractive interactions as a function of the coupling and a finite number asymmetry or polarization. In weak coupling, a number asymmetry results in phase separation. A mixed phase containing symmetric superfluid matter and an asymmetric normal phase is favored. For strong coupling we show that the stress on the superfluid phase to accommodate a number asymmetry increases. Near the infinite-scattering length, we calculate the single-particle excitation spectrum and the ground-state energy. A picture of weakly interacting quasiparticles emerges for modest polarizations. In this regime a homogeneous phase with a finite population of quasiparticle states characterized by a gapless spectrum is favored over the phase separated state. These states may be realized in cold atom experiments.
%0 Journal Article
%1 Carlson2005Asymmetric
%A Carlson, J.
%A Reddy, Sanjay
%D 2005
%I American Physical Society
%J Physical Review Letters
%K cold\_atoms, condensed\_matter, fermions, strongly\_interacting
%N 6
%P 060401+
%R 10.1103/physrevlett.95.060401
%T Asymmetric Two-Component Fermion Systems in Strong Coupling
%U http://dx.doi.org/10.1103/physrevlett.95.060401
%V 95
%X We study the phase structure of a dilute two-component Fermi system with attractive interactions as a function of the coupling and a finite number asymmetry or polarization. In weak coupling, a number asymmetry results in phase separation. A mixed phase containing symmetric superfluid matter and an asymmetric normal phase is favored. For strong coupling we show that the stress on the superfluid phase to accommodate a number asymmetry increases. Near the infinite-scattering length, we calculate the single-particle excitation spectrum and the ground-state energy. A picture of weakly interacting quasiparticles emerges for modest polarizations. In this regime a homogeneous phase with a finite population of quasiparticle states characterized by a gapless spectrum is favored over the phase separated state. These states may be realized in cold atom experiments.
@article{Carlson2005Asymmetric,
abstract = {We study the phase structure of a dilute two-component Fermi system with attractive interactions as a function of the coupling and a finite number asymmetry or polarization. In weak coupling, a number asymmetry results in phase separation. A mixed phase containing symmetric superfluid matter and an asymmetric normal phase is favored. For strong coupling we show that the stress on the superfluid phase to accommodate a number asymmetry increases. Near the infinite-scattering length, we calculate the single-particle excitation spectrum and the ground-state energy. A picture of weakly interacting quasiparticles emerges for modest polarizations. In this regime a homogeneous phase with a finite population of quasiparticle states characterized by a gapless spectrum is favored over the phase separated state. These states may be realized in cold atom experiments.},
added-at = {2014-01-09T15:14:33.000+0100},
author = {Carlson, J. and Reddy, Sanjay},
biburl = {https://www.bibsonomy.org/bibtex/259b739059c2c31a7aac0318d0ede4dc1/jaspervh},
citeulike-article-id = {3213553},
citeulike-linkout-0 = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000095000006060401000001&idtype=cvips&gifs=yes},
citeulike-linkout-1 = {http://link.aps.org/abstract/PRL/v95/e060401},
citeulike-linkout-2 = {http://dx.doi.org/10.1103/physrevlett.95.060401},
doi = {10.1103/physrevlett.95.060401},
interhash = {f229f08edfe05a93adfb55a5eab19c79},
intrahash = {59b739059c2c31a7aac0318d0ede4dc1},
journal = {Physical Review Letters},
keywords = {cold\_atoms, condensed\_matter, fermions, strongly\_interacting},
month = aug,
number = 6,
pages = {060401+},
posted-at = {2013-01-04 14:52:01},
priority = {2},
publisher = {American Physical Society},
timestamp = {2014-01-09T15:14:33.000+0100},
title = {Asymmetric Two-Component Fermion Systems in Strong Coupling},
url = {http://dx.doi.org/10.1103/physrevlett.95.060401},
volume = 95,
year = 2005
}