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arXiv 0912.3284cond-mat.dis-nncond-mat.soft
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二维玻璃量杯

Gauge glass in two dimensions

Lei-Han Tang

摘要:

规范玻璃模型提供了一个有趣的例子,一个连续的O(2)对称性的随机挫折系统。在二维空间中,低温下玻璃相的存在长期以来在数值研究中一直存在争议。为了解决这一争议,我们研究的运动产生相位滑移,破坏相位刚性在大距离的旋涡的行为。详细的分析和数值研究相应的库仑气体问题的随机电位建立的基态,具有有限密度的涡旋,是极化与尺度相关的介电极化率。通过任意大尺寸的涡旋/反涡旋对的筛选,可以消除单个涡旋库仑能的对数发散。观察到的幂律衰减的涡旋之间的库仑相互作用的距离在基态导致幂律发散的玻璃相关长度与温度$T$。它认为,自由涡具有约束激发能和非零的扩散常数在任何$T>0$。

英文摘要:

The gauge glass model offers an interesting example of a randomly frustrated system with a continuous O(2) symmetry. In two dimensions, the existence of a glass phase at low temperatures has long been disputed among numerical studies. To resolve this controversy, we examine the behavior of vortices whose movement generates phase slips that destroy phase rigidity at large distances. Detailed analytical and numerical studies of the corresponding Coulomb gas problem in a random potential establish that the ground state, with a finite density of vortices, is polarizable with a scale-dependent dielectric susceptibility. Screening by vortex/antivortex pairs of arbitrarily large size is present to eliminate the logarithmic divergence of the Coulomb energy of a single vortex. The observed power-law decay of the Coulomb interaction between vortices with distance in the ground state leads to a power-law divergence of the glass correlation length with temperature $T$. It is argued that free vortices possess a bound excitation energy and a nonzero diffusion constant at any $T>0$.

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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