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arXiv 1004.4099quant-phcond-mat.quant-gasphysics.comp-ph
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一维p波相互作用费米子的离散与连续模型

Discretized vs. continuous models of p-wave interacting fermions in 1D

Dominik Muth, Michael Fleischhauer, Bernd Schmidt

摘要:

我们提出了一个一般的映射之间的连续和晶格模型的玻色和费米气体在一维,通过本地两体相互作用。对于s波相互作用玻色子,我们在弱相互作用、低密度区得到玻色-哈伯德模型。p波相互作用费米子的对偶问题被映射到接近高度极化区域临界点的自旋1/2 XXZ模型。映射被证明是最佳的意义上,他们产生的最小误差可能为一个给定的离散化长度。作为应用,我们研究了谐波阱中相互作用费米气体的基态,数值计算了实空间和动量空间分布以及两粒子关联。在分析已知的限制的收敛性的结果的晶格模型的连续的。

英文摘要:

We present a general mapping between continuous and lattice models of Bose- and Fermi-gases in one dimension, interacting via local two-body interactions. For s-wave interacting bosons we arrive at the Bose-Hubbard model in the weakly interacting, low density regime. The dual problem of p-wave interacting fermions is mapped to the spin-1/2 XXZ model close to the critical point in the highly polarized regime. The mappings are shown to be optimal in the sense that they produce the least error possible for a given discretization length. As an application we examine the ground state of a interacting Fermi gas in a harmonic trap, calculating numerically real-space and momentum-space distributions as well as two-particle correlations. In the analytically known limits the convergence of the results of the lattice model to the continuous one is shown.

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