


报告题目:二维拓扑激发驱动的热力学相变报 告 人: 张广铭 清华大学物理系 教授摘 要:传统的热力学相变的本质是对称性自发破缺,由Landau相变理论刻画。二维物理体系中,不存在连续对称性自发破缺的相变,但却存在拓扑激发驱动的超越Landau范式的热力学相变,即Kosterlitz-Thouless相变。本报告将系统讲述具有U(1)对称性的二维复杂体系中,如双层超导薄膜材料,多种类拓扑激发相互作用产生的新奇物态和拓扑相变。利用张...

报告时间:本周三(3月15日)下午4点报告地点:北园106报告厅报告人:张谷,北京量子信息科学研究院摘 要: Despite its ubiquity in quantum computation and quantum information, a universally applicable definition of quantum entanglement remains elusive. The challenge is further accentuated when entanglement is associated with other key themes, e.g., quantum interference and quantum statistics. Here,...

摘要 (Abstract) :Despite the rapid progress in the field of topological states, most of the topological systems studied up to now are based on crystalline materials. Recently, the study of topological states was extended to aperiodic systems, such as quasicrystals and amorphous systems. In this talk, I will first briefly review crystalline topological states and the structural characteristic o...