主讲人：董建军（中国科学院理论物理研究所）

题目：Mutual information, quantum phase transition, and phase coherence in Kondo systems

时间：2021年12月12日（周日）下午14:30

腾讯会议ID：713 694 372

联系人：钟 寅

报告摘要:

We propose a static auxiliary field approximation to study the hybridization physics of Kondo systems without the sign problem and use the mutual information to measure the intersite hybridization correlations. Our method takes full account of the spatial fluctuations of the hybridization fields at all orders and overcomes the artificial (first-order) phase transition predicted in the mean-field approximation. When applied to the two-impurity Kondo model, it reveals a logarithmically divergent amplitude mutual information near the so-called “Varma-Jones” fixed point and a large phase mutual information manifesting the development of intersite phase coherence in the Kondo regime, with observable influences on physical properties. These highlight the importance of hybridization fluctuations and confirm the mutual information as a useful tool to explore the hybridization physics in Kondo systems.

个人简介：

董建军，在四川大学获得学士学位和硕士学位，现为中国科学院物理研究所2017级理论物理专业的博士研究生。研究方向包括低维量子自旋体系中的阻挫效应、量子热力学与动力学量子相变、重费米子体系中的杂化物理等。