arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1108.4409cond-mat.quant-gascond-mat.str-el
收藏

双阱光晶格中费米子的Mott绝缘相和磁性

Mott insulating phases and magnetism of fermions in a double-well optical lattice

Xin Wang, Qi Zhou, S. Das Sarma

摘要:

本文利用非微扰强关联技术,从理论上研究了二维双阱光晶格中二分量费米子的Mott绝缘相和磁序。在每个位置填充两个费米子时,存在两种类型的莫特绝缘体,其中一种的特征在于低于尼尔温度的自旋1反铁磁性。该系统中的超交换相互作用是由带间相互作用和自旋自由度之间的相互作用引起的。双阱光晶格的一个很大的优点是可以通过调节二能级系统的轨道能量分裂来容易地控制磁量子相图和Neel温度。特别地,Neel温度可以比标准光学晶格中的Neel温度大一个数量级,这有利于光晶格系统中磁有序的实验研究。

英文摘要:

We theoretically investigate, using non-perturbative strong correlation techniques, Mott insulating phases and magnetic ordering of two-component fermions in a two-dimensional double-well optical lattice. At filling of two fermions per site, there are two types of Mott insulators, one of which is characterized by spin-1 antiferromagnetism below the Neel temperature. The super-exchange interaction in this system is induced by the interplay between the inter-band interaction and the spin degree of freedom. A great advantage of the double-well optical lattice is that the magnetic quantum phase diagram and the Neel temperature can be easily controlled by tuning the orbital energy splitting of the two-level system. Particularly, the Neel temperature can be one order of magnitude larger than that in standard optical lattices, facilitating the experimental search for magnetic ordering in optical lattice systems.

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。

↑