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arXiv 1002.1433cond-mat.quant-gascond-mat.str-el
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一维布居不平衡费米凝聚的基态和动力学

Ground states and dynamics of population-imbalanced Fermi condensates in one dimension

Masaki Tezuka, Masahito Ueda

摘要:

利用数值精确密度矩阵重整化群(DMRG)方法,研究了具有布居不平衡的一维费米子的基态,发现在很宽的参数范围内可以实现具有非零质心动量的费米子对的凝聚态Larkin-Ovchinnikov(LO)态.得到了由两个相位组成的相图:i)在陷阱中心的LO态和在外围的平衡凝聚态; ii)在陷阱中心的LO态和在外围的纯多数分量。约化的两体密度矩阵表明,大部分的少数原子有助于LO型准凝聚。利用含时的DMRG,我们还研究了一维费米子系统在自旋翻转激发下的实时动力学。

英文摘要:

By using the numerically exact density-matrix renormalization group (DMRG) approach, we investigate the ground states of harmonically trapped one-dimensional (1D) fermions with population imbalance and find that the Larkin-Ovchinnikov (LO) state, which is a condensed state of fermion pairs with nonzero center-of-mass momentum, is realized for a wide range of parameters. The phase diagram comprising the two phases of i) an LO state at the trap center and a balanced condensate at the periphery and ii) an LO state at the trap center and a pure majority component at the periphery, is obtained. The reduced two-body density matrix indicates that most of the minority atoms contribute to the LO-type quasi-condensate. With the time-dependent DMRG, we also investigate the real-time dynamics of a system of 1D fermions in response to a spin-flip excitation.

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