首 页机构概况机构设置科研人才队伍合作交流研究生教育博士后图书馆创新文化党群园地院重点实验室彭桓武中心信息公开
  学术活动
  您现在的位置:首页 > 学术活动 > 专题学术报告/Seminar
The Janus computer, a new window into the physics of spin glasses in three (and four) spatial dimensions
2012-04-25  【 】【打印】【关闭
Institute of Theoretical Physics
Chinese Academy of Sciences
学术报告
Title
题目
The Janus computer, a new window into the physics of spin glasses in three (and four) spatial dimensions
Speaker
报告人
Professor Victor Martin-Mayor
Departamento de Fisica Teorica I, Universidad Complutense de Madrid Spain
Date
日期
2012-04-25 PM 16:00 Wednesday
Venue
地点
Conference Hall 322, ITP/理论物理所322报告厅
Abstract
摘要

Spin glasses are a longstanding model for the sluggish dynamics that appears at the glass transition. The enjoy a privileged status in this context, as they provide the simplest model system both for theoretical and experimental studies of a glassy dynamics. However, in spite of forty years of intensive investigation, spin glasses still pose a formidable challenge to theoretical, computational and experimental physics. The main difficulty lies in their incredibly slow dynamics. A recent breakthrough has been made possible by our custom-built computer, Janus. For specific problems in Statistical Physics, Janus outperforms conventional computers by three orders of magnitude. It was designed and built in a collaboration formed by five universities in Spain and Italy.

After a general introduction to spin glasses, the talk will focus on the new physics unearthed by Janus. In particular, we recall our numerical study of the nonequilibrium dynamics of the Ising Spin Glass, for a time that spans eleven orders of magnitude, thus approaching the experimentally relevant scale (i.e. seconds) [1]. We have also studied the equilibrium properties of the spin-glass length, with an emphasis on the quantitative matching between nonequilibrium and equilibrium correlation functions [2]. Last but not least, we have clarified the existence of a glass transition in the presence of a magnetic field [3] (the so-called de Almeida-Thouless line).

[1] Janus collaboration: F. Belleti et al., Phys. Rev. Lett. 101 (2008) 157201, and J. Stat. Phys. 135, 1121-1158 (2009)

[2] Janus Collaboration: R. A. Baños et al.,Phys. Rev. Lett. 105, 177202 (2010) and J. Stat. Mech. (2010) P06026.

[3] Janus Collaboration: R. A. Baños et al., arXiv:1202.5593 (PNAS 2012, in press).

IE6.0浏览器,1024X768分辨率 版权所有 ? 中国科学院理论物理研究所
地址:北京市海淀区中关村东路55号 邮政编码:100190
京ICP备05002865号】 京公网安备1101080094号