Department of Physics, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan.
Phys Rev Lett. 2013 Sep 13;111(11):115303. doi: 10.1103/PhysRevLett.111.115303. Epub 2013 Sep 9.
Recently, the possibility of quantum simulation of dynamical gauge fields was pointed out by using a system of cold atoms trapped on each link in an optical lattice. However, to implement exact local gauge invariance, fine-tuning the interaction parameters among atoms is necessary. In the present Letter, we study the effect of violation of the U(1) local gauge invariance by relaxing the fine-tuning of the parameters and showing that a wide variety of cold atoms is still a faithful quantum simulator for a U(1) gauge-Higgs model containing a Higgs field sitting on sites. The clarification of the dynamics of this gauge-Higgs model sheds some light upon various unsolved problems, including the inflation process of the early Universe. We study the phase structure of this model by Monte Carlo simulation and also discuss the atomic characteristics of the Higgs phase in each simulator.
最近，有人指出通过使用被困在光学晶格每条链上的冷原子系统，有可能对动态规范场进行量子模拟。然而，为了实现精确的局部规范不变性，需要对原子之间的相互作用参数进行微调。在本信中，我们通过放宽参数的微调研究了违反 U(1)局部规范不变性的影响，并表明包含处于格点上的希格斯场的 U(1)规范-希格斯模型的各种冷原子仍然是规范-希格斯模型的忠实量子模拟器。对这个规范-希格斯模型的动力学的澄清为包括早期宇宙的膨胀过程在内的各种未解决问题提供了一些线索。我们通过蒙特卡罗模拟研究了这个模型的相结构，还讨论了每个模拟器中的希格斯相的原子特征。
