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• W2014185557 abstract "We study two-component (or pseudo-spin-$frac{1}{2}$) Bose or Fermi gases in one dimension, in which particles are convertible between the components. Through bosonization and numerical analyses of a simple lattice model, we demonstrate that, in such gases, a strong intercomponent repulsion induces spontaneous population imbalance between the components, namely, the ferromagnetism of the pseudo spins. The imbalanced phase contains gapless charge excitations characterized as a Tomonaga-Luttinger liquid and gapped spin excitations. We uncover a crucial effect of the intercomponent particle hopping on the transition to the imbalanced phase. In the absence of this hopping, the transition is of first order. At the transition point, the energy spectrum reveals certain degeneracy indicative of an emergent $text{SU}(2)$ symmetry. With an infinitesimal intercomponent hopping, the transition becomes of Ising type. We determine the phase diagram of the model accurately and test the reliability of the weak-coupling bosonization formalism." @default.
• W2014185557 created "2016-06-24" @default.
• W2014185557 creator A5017671273 @default.
• W2014185557 creator A5049037944 @default.
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• W2014185557 date "2010-05-10" @default.
• W2014185557 modified "2023-09-30" @default.
• W2014185557 title "Spontaneous population imbalance in two-component Bose and Fermi gases" @default.
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• W2014185557 doi "https://doi.org/10.1103/physreva.81.053606" @default.
• W2014185557 hasPublicationYear "2010" @default.
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