Hickey Ciarán, Paramekanti Arun
Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada.
Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada and Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada.
Phys Rev Lett. 2014 Dec 31;113(26):265302. doi: 10.1103/PhysRevLett.113.265302. Epub 2014 Dec 24.
Experiments on ultracold atoms have started to explore lattice effects and thermal fluctuations for two-component bosons with spin-orbit coupling (SOC). Motivated by this, we derive and study a tJ model for lattice bosons with equal Rashba-Dresselhaus SOC and strong Hubbard repulsion in a uniform Zeeman magnetic field. Using the Gutzwiller ansatz, we find strongly correlated ground states with stripe superfluid (SF) order. We formulate a finite temperature generalization of the Gutzwiller method, and show that thermal fluctuations in the doped Mott insulator drive a two-step melting of the stripe SF, revealing a wide regime of a stripe normal fluid.
超冷原子实验已开始探索具有自旋轨道耦合（SOC）的双组分玻色子的晶格效应和热涨落。受此启发，我们推导并研究了在均匀塞曼磁场中具有相等Rashba-Dresselhaus自旋轨道耦合和强哈伯德排斥作用的晶格玻色子的tJ模型。利用古兹维勒近似，我们发现了具有条纹超流体（SF）序的强关联基态。我们构建了古兹维勒方法的有限温度推广形式，并表明掺杂莫特绝缘体中的热涨落驱动条纹超流体的两步熔化，揭示了条纹正常流体的广泛区域。
