arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1207.2239cond-mat.quant-gas
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杂质对少玻色子系统量子相干性的影响

Impurity effects on the quantum coherence of a few-boson system

Pei Lu, Zhi-Hai Zhang, Shiping Feng, Shi-Jie Yang

摘要:

在二格位哈伯德模型下研究了杂质对少玻色子系统量子相干性的影响。周期性的崩溃和复苏的相干性发生在极化或非极化的费米子杂质的存在。玻色子-费米子相互作用与玻色子-玻色子相互作用的相对强度$U_{BF}/U_{BB}$在相干恢复中起着关键作用。随着杂质平均填充量的增加,$U_{BF}/U_{BB}=z$($z\in Z$为整数)的相干性恢复几乎不受影响,而$U_{BF}/U_{BB}=z+1/2$的奇恢复峰被抑制,这与实验结果一致.对于非极化的费米子杂质,相干回复与费米子-费米子相互作用的强度无关。

英文摘要:

The impurity effects on the quantum coherence of a few-boson system are studied within the two-site Hubbard model. Periodical collapses and revivals of coherence occur in the presence of either polarized or unpolarized fermionic impurities. The relative strength $U_{BF}/U_{BB}$ of the boson-fermion versus the boson-boson interactions plays a key role in the coherence revivals. As the average filling of the impurity increases, the coherence revivals remain nearly unaffected for $U_{BF}/U_{BB}=z$ ($z\in Z$ is an integer) while the odd revival peaks are damped for $U_{BF}/U_{BB}=z+1/2$, in agreement with the experimental observations. For unpolarized fermionic impurities, the coherence revivals are irrelevant to the strength of the fermion-fermion interactions.

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