Localization of Bose-Fermi Mixtures in One-Dimensional IncommensurateLattices
Localization of Bose-Fermi Mixtures in One-Dimensional IncommensurateLattices
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一维不通约晶格中玻色-费米混合物的局域化
DOI：
10.1088/1742-6596/400/1/012043
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Akiko Masaki and Hiroyuki Mori
中科院分区：
文献类型：
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作者：
早川尚男;大槻道夫;Makoto Katori;X. M. Tong and N. Toshima;Akiko Masaki and Hiroyuki Mori
利用量子蒙特卡罗模拟研究了非相称光学晶格上玻色-费米混合系统的局域性。我们发现了在较宽范围内改变玻色-玻色相互作用和玻色-费米相互作用时超流体密度的特征行为。在费米子存在的情况下，玻色子的超流动性由于玻色子-费米的排斥性相互作用而增强，抵消了玻色子的局域性。另一方面，对于吸引玻色子-费米相互作用，当玻色子的数量远远大于费米子的数量时，超流动性也会通过不同的机制得到增强。
We studied the localization property of Bose-Fermi mixture systems on incommensurate optical lattices by using quantum Monte-Carlo simulations. We found a characteristic behavior of the superfluid density when changing the Bose-Bose interactions and Bose-Fermi interactions over a wide range. The superfluidity of the bosons was enhanced in the presence of the fermions by the repulsive Bose-Fermi interactions which counteracted the localization of the bosons. With attractive Bose-Fermi interactions, on the other hand, the superfluidity is also enhanced by a different mechanism when the number of the bosons is much larger than that of the fermions.