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...
摘要:超快物质科学已经发展为凝聚态物理学的重要研究前沿之一。超短脉冲激光不仅为光谱学测量提供了时间分辨的维度,还将光与物质相互作用推至高度非线性的响应区间,为新奇量子物态提供了全新的研究手段。超短脉冲激光也是一种新型的物态调控工具,能够在飞秒(fs)时间尺度下驱动绝热物态相变,有助于发现新现象、新效应和新物理。本报告的第一部分将介绍自主搭建的泵浦光波长准连续可调的“泵浦-探测”宽带光谱测量系统。我...