量子科学中心
 首页  新闻动态  中心介绍  人员构成  科学研究  通知公告  招生招聘  人才培养  合作交流 
 通知公告 
通知公告
当前位置: 首页>>通知公告>>正文

理论物理前沿讲座第四期通知

2016-11-10 量子科学中心 点击:[]

题目:Quantum Phase Transition, Magnetic Field, and Wilson Ratios

报告人:林海青(”千人计划“特聘教授)

时间:2016.11.16 16:00

地点量子中心六楼会议室

林海青教授现任中国工程物理研究院北京计算科学研究中心主任,“千人计划”特聘教授,国家B类杰出青年基金获得者,“973”项目首席科学家。从事计算方法、量子多体问题、量子纠缠和量子相变、磁性与超导物理的理论和计算研究工作。2003年因在“发展和应用量子多体问题的计算方法”方面的贡献成为美国物理学会Fellow。现任IUPAP计算物理专业委员会(C20)主席。发表学术论文300多篇,SCI他引4500多次,单篇最高引用700多次。

Abstract:

Novel quantum states and associated phase transitions could be induced and observed by magnetic fields. Using the one-dimensional antiferromagnetic Heisenberg model as an example, we examine quantum criticality and scaling behavior at transition point. We show that the original Wilson ratio, defined as the ratio of magnetic susceptibility over heat capacity divided by temperature, and the one generalized by us, defined as the ratio of particle compressibility over heat capacity divided by temperature could both be used to characterize low temperature phases of a wide variety of materials and provide universal scaling relations at the boundaries between phases. We demonstrate these findings in the experimentally realized multi-species cold atomic gases. Since these WRs are composed of direct measurable thermodynamic quantities such as the magnetic susceptibility, our findings provide an easy way to map out quantum phases experimentally.

Acknowledgement: In collaborations with

Feng He, Yu-Zhu Jiang, Yi-Cong Yu and Yang-Yang Chen,

State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,

Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China

Rudolf A. Römer,

Department of Physics and Centre for Scientific Computing,

University of Warwick, Coventry, CV4 7AL, UK

Xi-Wen Guan,

Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China

Department of Theoretical Physics, Research School of Physics and Engineering,

Australian National University, Canberra ACT 0200, Australia

上一条:11月16日组会通知 下一条:理论物理前沿讲座第三期通知

关闭

©版权所有:东北师范大学量子科学中心 地址:吉林省长春市净月经济开发区净月大街2555号 邮编:130117