arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0910.0508cond-mat.quant-gascond-mat.str-el
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光晶格中的D波玻色子对

D-wave bosonic pair in an optical lattice

Zi Cai, Lei Wang, Jian Li, Shu Chen, X. C. Xie, Yupeng Wang

摘要:

提出了一个玻色子模型,其中两个玻色子通过四格点环交换相互作用可以形成具有d波对称性的束缚对。一个d-波配对超流以及d-波密度波(DDW)的状态,提出了在这个系统中可以实现。这种奇异的玻色子系统可以在二维吸引p带无自旋费米子系统的BEC区中实现。通过平均场方法,我们发现在低密度下,d波对可以凝聚,形成d波玻色子对超流体。在某些特定的填充因子下,出现了一种新的相位,即d波密度波态。我们利用时间演化块抽取(TEBD)方法研究了双阶梯结构中的DDW态及其相应的量子相变。

英文摘要:

We present a bosonic model, in which two bosons may form a bound pair with d-wave symmetry via the four-site ring exchange interaction. A d-wave pairing superfluid as well as a d-wave density wave (DDW) state, are proposed to be achievable in this system. This exotic bosonic system can be realized in the BEC zone of a two-dimensional attractive p-band spinless fermionic system. By the mean field approach, we find that at low densities, the d-wave pairs may condensate, leading to a d-wave bosonic paired superfluid. At some particular filling factors, a novel phase, d-wave density wave state, emerges. We study this DDW state and its corresponding quantum phase transition in a two-leg ladder by the time-evolving block decimation (TEBD) method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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