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arXiv 1604.01043cond-mat.stat-mechcond-mat.quant-gas
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紧Kardar-Parisi-Zhang方程的格对偶

Lattice duality for the compact Kardar-Parisi-Zhang equation

L. M. Sieberer, G. Wachtel, E. Altman, S. Diehl

摘要:

二维超流体在热平衡下的Kosterlitz-Less转变的综合理论可以在一个对偶表象中发展出来,该表象将超流体中的涡旋映射到库仑气体中的电荷。在这个框架中,在临界温度下涡旋-反涡旋对的解离对应于自由电荷等离子体的形成。另一方面,在驱动耗散系统(如光的流体)中,涡旋解束缚的物理学却少得多。在这里,我们做了一个关键的一步,以填补这一空白,推导出一个变换,映射紧凑的Kardar-Parisi-Zhang(KPZ)方程,它描述了一个驱动耗散凝聚相的动力学,一个双电动力学理论。后者是根据修正的麦克斯韦方程组的电磁场和一个扩散方程的电荷表示涡旋的KPZ方程。这种映射利用了一个适应的Villain近似的广义Martin-Siggia-Rose功能积分表示的紧凑KPZ方程的格。

英文摘要:

A comprehensive theory of the Kosterlitz-Thouless transition in two-dimensional superfluids in thermal equilibrium can be developed within a dual representation which maps vortices in the superfluid to charges in a Coulomb gas. In this framework, the dissociation of vortex-antivortex pairs at the critical temperature corresponds to the formation of a plasma of free charges. The physics of vortex unbinding in driven-dissipative systems such as fluids of light, on the other hand, is much less understood. Here we make a crucial step to fill this gap by deriving a transformation that maps the compact Kardar-Parisi-Zhang (KPZ) equation, which describes the dynamics of the phase of a driven-dissipative condensate, to a dual electrodynamic theory. The latter is formulated in terms of modified Maxwell equations for the electromagnetic fields and a diffusion equation for the charges representing vortices in the KPZ equation. This mapping utilizes an adaption of the Villain approximation to a generalized Martin-Siggia-Rose functional integral representation of the compact KPZ equation on a lattice.

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