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arXiv 2108.12422cond-mat.stat-mechquant-ph
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具有长程损耗的Ising critical states的普适类

Universality class of Ising critical states with long-range losses

Jamir Marino

摘要:

我们表明,空间分辨耗散可以作用于$d$维自旋系统的伊辛普适类定性修改其临界点的性质。我们考虑幂律衰减自旋损耗,其Lindbladian谱在小动量处闭合为$\propto q^α$,$α$是与长距离损耗空间分布的幂律衰减直接相关的正可调指数,$1/r^{(α+d)}$。这产生了一类软模式渐近解耦耗散在小动量,这是负责的出现一个关键的标度制度归因于非酉对应的普遍性类的远程相互作用伊辛模型。对于$α<1$,我们发现一个非平衡临界点统治的动力学场论所描述的朗之万模型与共存的惯性($\sim {\partial^2_t}$)和摩擦($\sim {\partial_t}$)的动力学系数,并在小动量的方差$\propto q^α$的无隙马尔可夫噪声驱动。这种有效场论超越了Halperin-Hohenberg动力学临界性的描述,其临界指数不同于它们的酉长程对应物。我们的工作奠定了驱动开放系统的普遍性修订的前景,采用暗态泰勒可编程耗散。

英文摘要:

We show that spatial resolved dissipation can act on $d$-dimensional spin systems in the Ising universality class by qualitatively modifying the nature of their critical points. We consider power-law decaying spin losses with a Lindbladian spectrum closing at small momenta as $\propto q^α$, with $α$ a positive tunable exponent directly related to the power-law decay of the spatial profile of losses at long distances, $1/r^{(α+d)}$. This yields a class of soft modes asymptotically decoupled from dissipation at small momenta, which are responsible for the emergence of a critical scaling regime ascribable to the non-unitary counterpart of the universality class of long-range interacting Ising models. For $α<1$ we find a non-equilibrium critical point ruled by a dynamical field theory described by a Langevin model with coexisting inertial ($\sim {\partial^2_t}$) and frictional ($\sim {\partial_t}$) kinetic coefficients, and driven by a gapless Markovian noise with variance $\propto q^α$ at small momenta. This effective field theory is beyond the Halperin-Hohenberg description of dynamical criticality, and its critical exponents differ from their unitary long-range counterparts. Our work lays out perspectives for a revision of universality in driven-open systems by employing dark states taylored by programmable dissipation.

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