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| 光晶格中自旋3/2超冷费米原子的Mott绝缘态及其量子相变 | |
| 引用本文： | 张广铭,涂鸿浩. 光晶格中自旋3/2超冷费米原子的Mott绝缘态及其量子相变[J]. 中国科学:物理学 力学 天文学, 2011, 0(4): 356-368 |
| 作者姓名： | 张广铭 涂鸿浩 |
| 作者单位： | 清华大学物理系; |
| 摘 要： | 我们首先简要介绍了超冷原子和光晶格,然后利用推广的单带Hubbard模型讨论了二维正方光晶格中自旋3/2费米型超冷原子体系中的几种Mott绝缘态,其中该系统的自旋自由度具有较大SO(5)对称性.对于对称性破缺的自旋四极矩有序态和自旋偶极-八极矩共存有序态,我们详细研究了系统的低能集体激发模式-Goldstone玻色激发的具体行为.在SU(4)对称点附近,我们发现强烈的量子涨落可能会演生出一个SU(4)π通量的自旋液体态.对此,我们还分析了这两种奇异量子态之间可能存在的量子相变. |
| 关 键 词： | 超冷原子 Mott绝缘态 集体激发 量子相变 |
Mott insulating states and their quantum phase transitions of interacting spin-3/2 ultracold fermionic atoms on optical lattices |
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| ZHANG GuangMing , TU HongHao. Mott insulating states and their quantum phase transitions of interacting spin-3/2 ultracold fermionic atoms on optical lattices[J]. SCIENCE CHINA Physics, Mechanics & Astronomy, 2011, 0(4): 356-368 | |
| Authors: | ZHANG GuangMing & TU HongHao |
| Affiliation: | ZHANG GuangMing & TU HongHao Department of Physics,Tsinghua University,Beijing 100084,China |
| Abstract: | We first introduce the ultracold atoms and the optical lattices. Then, we analyze various Mott insulating phases of interacting spin-3/2 fermionic ultracold atoms in two-dimensional square optical lattices. Using a generalized Hubbard model, we identify two distinct symmetry breaking phases: the spin-quadrupole ordering phase and the spin-dipole-spin-octupole ordering phase. Near the SU(4) symmetric point, we find that an algebraic spin liquid phase may emerge due to strong quantum fluctuations. Finally, th... |
| Keywords: | ultracold atoms Mott insulating states collective excitations quantum phase transitions |
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