以静态 Holstein 模型为例说明抑制场驱动加热的电子机制
Electronic Mechanism that Quenches Field-Driven Heating as Illustrated with the Static Holstein Model
AI总结：
本文以静态 Holstein 模型为例，揭示了通过驱动电子在动量空间均匀分布来抑制强直流电场下多体系统失控加热的机制，发现电流过早归零会形成非平庸微带分布，且场强可调节各微带的有效温度，为预热阶段实现亚稳态分布提供了理论依据。
摘要：
量子系统的时间依赖驱动已成为工程化远离热平衡的奇异相的有力工具，但在多体相互作用存在时也会导致失控加热，因此一般系统被认为会持续加热直至达到无特征的无限温度状态。理解如何减缓甚至避免这种热死亡的机制是一个重要目标——其中一种机制是驱动电子在动量空间中趋于均匀分布。我们展示了在强直流电场驱动下，对于具有宏观数量守恒量的相互作用电荷密度波链，这种机制如何避免失控加热；随着电流被过早驱动至零，形成了具有非平庸分布函数的微带。此外，当接近零温度共振时，场强可以调节每个微带的有效温度在正、负或接近无穷大之间切换。我们的结果表明，在与慢玻色子模式耦合的量子系统的预热阶段，应能实现非平庸的亚稳态分布函数。
英文摘要：
Time-dependent driving of quantum systems has emerged as a powerful tool to engineer exotic phases far from thermal equilibrium, but in the presence of many-body interactions it also leads to runaway heating, so that generic systems are believed to heat up until they reach a featureless infinite-temperature state. Understanding the mechanisms by which such a heat death can be slowed down or even avoided is a major goal -- one such mechanism is to drive toward an even distribution of electrons in momentum space. Here we show how such a mechanism avoids runaway heating for an interacting charge-density-wave chain with a macroscopic number of conserved quantities when driven by a strong dc electric field; minibands with nontrivial distribution functions develop as the current is prematurely driven to zero. Moreover, when approaching a zero-temperature resonance, the field strength can tune between positive, negative, or close-to-infinite effective temperatures for each miniband. Our results suggest that nontrivial metastable distribution functions should be realized in the prethermal regime of quantum systems coupled to slow bosonic modes.
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