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arXiv 1807.07574cond-mat.str-elhep-lat
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量子相位母态为费米子物质的晶格紧致量子电动力学的Monte Carlo研究

Monte Carlo Study of Lattice Compact Quantum Electrodynamics with Fermionic Matter: the Parent State of Quantum Phases

Xiao Yan Xu, Yang Qi, Long Zhang, Fakher F. Assaad, Cenke Xu, Zi Yang Meng

摘要:

格点规范理论和费米子物质之间的相互作用解释了基本的物理现象,从粒子物理学中的夸克的解除禁闭到凝聚态物理中具有分馏任意子的量子自旋液体和涌现规范结构。然而,除了某些限制(例如大量的物质场的味道),分析方法可以提供一些具体的结果。在这里,我们表明,在$(2+1)$ D耦合到费米子物质的紧凑$U(1)$格点规范理论的问题是可能的访问通过无符号问题的量子蒙特卡罗模拟。因此,我们可以绘制出作为费米子味和规范涨落强度函数的相图。通过增加规范场的耦合常数,出现了各种自发对称性破缺相,如价键固体(VBS)和Néel反铁磁体。还观察到了具有代数自旋和VBS关联函数的非受限相位。这种非精细相是奇异物质态的化身,$i.e.$是代数自旋液体,通常被视为各种量子相的母态。非受限相和受限相之间以及不同受限相之间的相变提供了非受限量子临界性的各种表现。特别是,对于四种口味,$N_f = 4$,我们的数据表明VBS和Néel顺序之间的连续量子相变。我们还对这些量子相变进行了初步的理论分析。

英文摘要:

The interplay between lattice gauge theories and fermionic matter accounts for fundamental physical phenomena ranging from the deconfinement of quarks in particle physics to quantum spin liquid with fractionalized anyons and emergent gauge structures in condensed matter physics. However, except for certain limits (for instance large number of flavors of matter fields), analytical methods can provide few concrete results. Here we show that the problem of compact $U(1)$ lattice gauge theory coupled to fermionic matter in $(2+1)$D is possible to access via sign-problem-free quantum Monte Carlo simulations. One can hence map out the phase diagram as a function of fermion flavors and the strength of gauge fluctuations. By increasing the coupling constant of the gauge field, gauge confinement in the form of various spontaneous symmetry breaking phases such as valence bond solid (VBS) and Néel antiferromagnet emerge. Deconfined phases with algebraic spin and VBS correlation functions are also observed. Such deconfined phases are an incarnation of exotic states of matter, $i.e.$ the algebraic spin liquid, which is generally viewed as the parent state of various quantum phases. The phase transitions between deconfined and confined phases, as well as that between the different confined phases provide various manifestations of deconfined quantum criticality. In particular, for four flavors, $N_f = 4$, our data suggests a continuous quantum phase transition between the VBS and Néel order. We also provide preliminary theoretical analysis for these quantum phase transitions.

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。

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