论文标题
二维BCS-BEC交叉中的涡流动力学
Vortex dynamics in the two-dimensional BCS-BEC crossover
论文作者
论文摘要
Bardeen-Cooper-Schrieffer（BCS）凝结和Bose-Einstein凝结（BEC）是配对费米昂系统的两个限制基态，这两个限制之间的交叉始终是高温超导性和冷原子高原子的两个领域的兴奋来源。对于超导体，像石墨烯和lixzrncl这样的超低兴奋剂系统从BCS侧开始成功接近交叉。这些超导体提供了新的机会，可以澄清带电粒子向BEC政权运输的性质。在这里，我们报告了交叉中涡流动力学的研究，该研究使用其霍尔效应作为lixzrncl中的探针。我们观察到了大厅与BCS-BEC跨界的系统增强，该角度是由现象学时间依赖性的Ginzburg-Landau（TDGL）理论质量化的。 lixzrncl表现出没有各种电子不稳定性的频带结构，使我们能够全面了解涡流厅效应，从而提出了交叉中涡流动力学的全球图像。这些结果表明，栅极控制的超导体是研究BEC超导体未开发性质的理想平台。
The Bardeen-Cooper-Schrieffer (BCS) condensation and Bose-Einstein condensation (BEC) are the two limiting ground states of paired Fermion systems, and the crossover between these two limits has been a source of excitement for both fields of high temperature superconductivity and cold atom superfluidity. For superconductors, ultra-low doping systems like graphene and LixZrNCl successfully approached the crossover starting from the BCS-side. These superconductors offer new opportunities to clarify the nature of charged-particles transport towards the BEC regime. Here we report the study of vortex dynamics within the crossover using their Hall effect as a probe in LixZrNCl. We observed a systematic enhancement of the Hall angle towards the BCS-BEC crossover, which was qualitatively reproduced by the phenomenological time-dependent Ginzburg-Landau (TDGL) theory. LixZrNCl exhibits a band structure free from various electronic instabilities, allowing us to achieve a comprehensive understanding of the vortex Hall effect and thereby propose a global picture of vortex dynamics within the crossover. These results demonstrate that gate-controlled superconductors are ideal platforms towards investigations of unexplored properties in BEC superconductors.
