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“恒元物理学讲座” (第016期)


时间:2013/06/26 21:15:45来源:威廉希尔kyms点击量:
 

报告题目Incompressible Quantum Glass state and Pair Supersolid state of Bosons 

人:郭文安 教授 Physics Department, Beijing Normal University

报告时间:2013628日(星期五)下午4:30

报告地点:威廉希尔六层学术报告厅(长安校区致知楼3623-3624

人:王新刚  教授

报告简介:

Quantum glass and pair supersolid are novel quantum states of interacting lattice bosons.  I will first discuss the quantum glass state of lattice bosons with random potentials. Its properties at zero temperature are controlled by rare large regions of superfluid surrounded by Mott insulator. These regions make the state gapless although it is insulating. Contrary to the commonly accepted theory of this state in two dimensions, we show that a vanishing gap does not necessarily imply nonzero compressibility by using quantum Monte Carlo simulations of the Bose-Hubbard model and a  percolation theory. Next I will talk about the existence and stability of the pair supersolid phase in an extended Bose-Hubbard model on the triangular lattice. Such a system can be realized experimentally for dipolar bosons polarized by an external electric field and confined in the optical lattice.   

报告人简介:

郭文安,1990年毕业于兰州大学。1993年在兰州大学获硕士学位,1996年在北京师范大学获博士学位。1997-1998年在荷兰Delft理工大学做博士后研究。后任教于北京师范大学,2004年起任教授。2008年入选教育部新世纪人才支持计划。主要研究方向是统计物理和计算物理,经典与量子模型相变与临界现象的数值研究。目前已发表学术论文近40篇,其中包括4PRL和一篇编辑推荐PRB文章。

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