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arXiv 1802.00451cond-mat.str-el
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玻色金属对2D超导体Berezinskiii-Kosterlitz-无相变的破坏

Bose Metal as a Disruption of the Berezinskii-Kosterlitz-Thouless Transition in 2D Superconductors

Philip W. Phillips

摘要:

薄膜中超导性的破坏被认为是别列津斯基-科斯特利茨无核物理学的一个简单例子,其中只存在两相:具有代数长程序的超导体,其中涡旋凝聚,绝缘体中涡旋-反涡旋对增殖。然而,自1989年以来,这一观点受到了挑战,因为现在大量的实验表明,当超导性被破坏时,会出现一种介入的玻色子金属态。我们在这里审查玻璃模型,能够捕捉这两个功能。有限电阻产生于三个特征。首先,在没有费米子自由度(仅限库珀对)的情况下,无序的绝缘体-超导体转变由扩散固定点\cite{CN}控制,而不是由干净系统的临界点控制。因此,产生玻色金属的相关物理学应该来自于不同复制品混合的行动中的一个术语。我们明确地表明,这样的物理出现在相玻璃。第二,在2D(而不是3D)中,玻璃相的相刚度明确地消失,如在广泛的数值模拟\cite{ky,kosterlitz1,kosterlitz2}中所示。第三,在这样一个玻璃环境中运动的玻色子由于景观中的假极小值而不能定域。我们计算的电导率明确使用久保响应,并表明它打开作为一个幂律,并有一个消失的霍尔响应作为潜在的粒子-空穴对称性的结果。我们表明,当粒子-空穴对称性被打破,霍尔电导打开与相同的幂律的纵向电导。

英文摘要:

Destruction of superconductivity in thin films was thought to be a simple instance of Berezinskii-Kosterlitz-Thouless physics in which only two phases exist: a superconductor with algebraic long range order in which the vortices condense and an insulator where the vortex-antivortex pairs proliferate. However, since 1989 this view has been challenged as now a preponderance of experiments indicate that an intervening bosonic metallic state obtains upon the destruction of superconductivity. We review here a glassy model which is capable of capturing both of these features. The finite resistance arises from three features. First, the disordered insulator-superconductor transition in the absence of fermionic degrees of freedom (Cooper pairs only), is controlled by a diffusive fixed point\cite{CN} rather than the critical point of the clean system. Hence, the relevant physics that generates the Bose metal should arise from a term in the action in which different replicas are mixed. We show explicitly how such physics arises in the phase glass. Second, in 2D (not in 3D) the phase stiffness of the glass phase vanishes explicitly as has been shown in extensive numerical simulations\cite{ky,kosterlitz1,kosterlitz2}. Third, bosons moving in such a glassy environment fail to localize as a result of the false minima in the landscape. We calculate the conductivity explicitly using Kubo response and show that it turns on as a power law and has a vanishing Hall response as a result of underlying particle-hole symmetry. We show that when particle-hole symmetry is broken, the Hall conductance turns on with the same power law as does the longitudinal conductance.

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