Tang Lei-Han, Tong Peiqing
Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China.
Phys Rev Lett. 2005 May 27;94(20):207204. doi: 10.1103/PhysRevLett.94.207204. Epub 2005 May 24.
The zero-temperature critical state of the two-dimensional gauge glass model is investigated. It is found that low-energy vortex configurations afford a simple description in terms of gapless, weakly interacting vortex-antivortex pair excitations. A linear dielectric screening calculation is presented in a renormalization group setting that yields a power law decay of spin-wave stiffness with distance. These properties are in agreement with low-temperature specific heat and spin-glass susceptibility data obtained in large-scale multicanonical Monte Carlo simulations.
研究了二维规范玻璃模型的零温临界状态。结果发现，低能涡旋构型可以用无能隙、弱相互作用的涡旋 - 反涡旋对激发来进行简单描述。在重整化群框架下给出了一个线性电介质屏蔽计算，其结果是自旋波刚度随距离呈幂律衰减。这些性质与在大规模多正则蒙特卡罗模拟中获得的低温比热和自旋玻璃磁化率数据相符。
