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中共中央政治局委员、国家副主席李源潮调研中国科大先研院
2017-05-24
中国科大四位科学家荣获首届全国创新争先奖
2017-05-31

高等学校创新能力提升计划
中国科学技术大学
南京大学
中科院上海技术物理研究所
中科院半导体研究所
国防科学技术大学
Topological orbital fermions in optical lattices
报告题目  Topological orbital fermions in optical lattices
报告人  Prof. W. Vincent Liu
报告人单位  University of Pittsburgh
报告时间  2012-06-14 16:00
报告地点  中国科学技术大学理化大楼9004室
主办单位  量子信息与量子科技前沿协同创新中心
报告介绍

Abstract: 

The recent implementation of orbital degrees of freedom in double-well optical lattices opens up a new avenue towards discovering novel quantum states of matter that have no prior
analogues in solid-state electronic materials. In this talk, I will first give a brief review on some of the most exciting developments of optical lattice p-orbitals in both theory and experiment.
Then, I will focus on two examples of topological order. One is a topological semimetal, characterized by a parabolic band-degeneracy point with Berry flux 2\pi due to the mixing of p and d orbital bands of a two-dimensional optical lattice.  Another is the emergence of a Z_2 topological insulator of interacting fermions on a two-leg ladder of s and p orbitals, requiring none of the
previously known mechanisms such as spin-orbit coupling, artificial gauge field, or p-wave pairing. The odd parity of p-orbitals is found key to both topological examples.

 

References:
[1] M. Lewenstein and WVL, Nat. Phys. 7, 101 (2011);
[2] K. Sun, WVL, A. Hemmerich, S. Das Sarma, Nat. Phys. 8, 6770 (2012);
[3] X. Li, E. Zhao, WVL, arXiv:1205.0254. 

Acknowledge support by ARO, AFOSR, and DARPA of the U.S. DOD, and A. Mellon Foundation.


Copyright 2011-2016
中国科学技术大学、南京大学、上海技术物理研究所、半导体研究所、国防科学技术大学
2011 量子信息与量子科技前沿协同创新中心
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