论文标题
Wigner晶体的熔化，恢复有序和峰值效果的峰值效应
Melting, Reentrant Ordering and Peak Effect for Wigner Crystals with Quenched and Thermal Disorder
论文作者
论文摘要
我们考虑在存在热波动的情况下与随机猝灭障碍相互作用的Wigner晶体的模拟。当缺乏淬火障碍时，有一个明确的熔化温度取决于拓扑缺陷的增殖，而对于零温度，存在临界的猝灭障碍强度，高于拓扑缺陷，拓扑缺陷会增殖。当存在热障碍和淬火障碍时，这些效果会竞争，并且热波动可以降低淬灭障碍的有效性，从而导致与尼尔森的预测相一致，从而导致重新进入阶段。 Rev. B 27，2902（1983）]。可以根据运输响应的变化来推导重入阶段的发作，在这种变化中，返回有序作为迁移率的增加或默认过渡的发生。我们还发现，当系统处于有序状态和热熔体处时，有效阻尼或固定会增加。这会产生电子迁移率的下降，类似于超导涡流中发现的峰值效应现象，其中热效应会使晶格软化或分解其弹性，从而使颗粒更好地调节其位置以充分利用猝灭障碍。
We consider simulations of Wigner crystals interacting with random quenched disorder in the presence of thermal fluctuations. When quenched disorder is absent, there is a well defined melting temperature determined by the proliferation of topological defects, while for zero temperature, there is a critical quenched disorder strength above which topological defects proliferate. When both thermal and quenched disorder are present, these effects compete, and the thermal fluctuations can reduce the effectiveness of the quenched disorder, leading to a reentrant ordered phase in agreement with the predictions of Nelson [Phys. Rev. B 27, 2902 (1983)]. The onset of the reentrant phase can be deduced based on changes in the transport response, where the reentrant ordering appears as an increase in the mobility or the occurrence of a depinning transition. We also find that when the system is in the ordered state and thermally melts, there is an increase in the effective damping or pinning. This produces a drop in the electron mobility that is similar to the peak effect phenomenon found in superconducting vortices, where thermal effects soften the lattice or break down its elasticity, allowing the particles to better adjust their positions to take full advantage of the quenched disorder.
