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Deconfined quantum criticality with two divergent length scales

来源: 作者: 发布时间:2016-06-20

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时间: 2016-06-20

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7003全讯入口“博约学术论坛”系列报告
第120期     (2016年第10期)

Title:Deconfined quantum criticality with two divergent length scales
报告人:邵慧 博士(北京计算科学研究中心)
时   间:6月22日(周三)上午10:00
地   点:中心教学楼610
ABSTRACT
Deconfined quantum critical point (DQCP) [1] predicts a continuous quantum phase transition with two divergent length scales between the standard Neel antiferromagnet (AFM) and a valence-bond solid (VBS) in two dimensions, where the standard correlation length /xi governs the order parameter scaling behaviors, while the second length scale /xi’, which diverges faster than /xi, governs an emergent U(1) symmetry and the deconfinement length scale of fractional S=1/2 excitations (spinons). Numerical simulations of different microscopic models show controversial conclusions. In this talk, I will present our recent work [2] on this topic. From a new perspective of domain wall properties, we found that the longer length scale affects finite size scaling properties more dramatically than in previously known systems with two divergent length scales, and this is the reason for the previously puzzling behaviors found in simulations.
[1] T. Senthil et al., Science 303, 1490 (2004).
[2] H. Shao, W. Guo, A. W. Sandvik, Science 352, 213 (2016).

Curriculum Vitae
邵慧于2010年在华东师范大学物理学系取得学士学位,并于2015年在北京师范大学物理学系取得理论物理博士学位。她目前在北京计算科学研究中心(CSRC)从事博士后研究工作,同时也是波士顿大学(BU)的访问学者。主要研究方向为:经典和量子蒙特卡洛数值方法,相变和临界现象,以及量子自旋系统的性质。最近她以第一作者在《Science》上发表论文。本报告专题报道该论文工作。

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