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arXiv 1808.01993cond-mat.stat-mechcond-mat.quant-gasquant-ph
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具有竞争短程和长程相互作用的量子XX模型:平衡态和非平衡态的相和相变

Quantum XX-model with competing short- and long-range interactions: Phases and phase transitions in and out of equilibrium

Ferenc Iglói, Benjamin Blaß, Gergö Roósz, Heiko Rieger

摘要:

我们考虑了存在竞争的最近邻相互作用和全局范围相互作用的量子XX模型,它等价于在硬核玻色子极限下具有腔介导的全局范围相互作用的玻色-哈伯德模型.利用费米子技术,在热力学极限下,在一维中精确地解决了这个问题。基态相图由两个有序相组成:铁磁(F)和反铁磁(AF),以及具有准长程序的XY相。我们还研究了突然猝灭后的量子弛豫。在动态转变线下方观察到从AF相到XY区域剩余AF顺序的猝灭。在相反的失超过程中,从XY区到AF相,在一条静态亚稳线之外,AF序出现在回复XY准长程序之上,对应于具有硬核玻色子的等效Bose-哈伯德模型中动态生成的超固态。

英文摘要:

We consider the quantum XX-model in the presence of competing nearest-neighbour and global-range interactions, which is equivalent to a Bose-Hubbard model with cavity mediated global range interactions in the hard core boson limit. Using fermionic techniques the problem is solved exactly in one dimension in the thermodynamic limit. The ground state phase diagram consists of two ordered phases: ferromagnetic (F) and antiferromagnetic (AF), as well as an XY-phase having quasi-long-range order. We have also studied quantum relaxation after sudden quenches. Quenching from the AF phase to the XY region remanent AF order is observed below a dynamical transition line. In the opposite quench, from the XY region to the AF-phase beyond a static metastability line AF order arises on top of remanent XY quasi-long-range order, which corresponds to dynamically generated supersolid state in the equivalent Bose-Hubbard model with hard-core bosons.

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