Resonating plaquette phases in large spin cold atom systems
Resonating plaquette phases in large spin cold atom systems
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大型自旋冷原子系统中的共振板相
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Congjun Wu
中科院分区：
文献类型：
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作者：
Cenke Xu;Congjun Wu
大自旋冷原子系统可以表现出通常的自旋1/2系统所没有的新的磁性。研究了自旋为3/2冷费米子的三维立方光学晶格中SU(4)共振斑片态。构造了一种新的规范场形式来描述Rokhsar-Kivelson类型的哈密顿量，并用对偶变换来研究相图。由于拓扑缺陷的扩散，系统在量子模型的整个相图中一般是空隙的，这与最近的数值研究是一致的。找到了经典斑块体系的一条临界线，它也对应于“斑块液体”中的量子多体波函数。
Large spin cold atom systems can exhibit novel magnetic properties which do not appear in usual spin-1/2 systems. We investigate the SU(4) resonating plaquette state in the three dimensional cubic optical lattice with spin-3/2 cold fermions. A novel gauge field formalism is constructed to describe the Rokhsar-Kivelson type of Hamiltonian and a duality transformation is used to study the phase diagram. Due to the proliferation of topological defects, the system is generally gapped for the whole phase diagram of the quantum model, which agrees with the recent numerical studies. A critical line is found for the classical plaquette system, which also corresponds to a quantum many-body wavefunction in a “plaquette liquid phase”.