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Topological Flat Bands from Dipolar Spin Systems

zqyin 添加于 2012-7-20 14:33 | 1458 次阅读 | 0 个评论

作者
Yao NY, Laumann CR, Gorshkov AV, Bennett SD, Demler E, Zoller P, Lukin MD
摘要
We propose and analyze a physical system that naturally admits two-dimensional topological nearly flat bands. Our approach utilizes an array of three-level dipoles (effective S = 1 spins) driven by inhomogeneous electromagnetic fields. The dipolar interactions produce arbitrary uniform background gauge fields for an effective collection of conserved hardcore bosons, namely, the dressed spin-flips. These gauge fields result in topological band structures, whose bandgap can be larger than the corresponding bandwidth. Exact diagonalization of the full interacting Hamiltonian at half-filling reveals the existence of superfluid, crystalline, and supersolid phases. An experimental realization using either ultra-cold polar molecules or spins in the solid state is considered.
详细资料
- 关键词: cond-mat.str-el; cond-mat.quant-gas; quant-ph
- 文献种类:手稿
- 期卷页: 2012年
- 日期: 2012-7-19
- 发布方式: arXiv e-prints
- 备注:arXiv:1207.4479v1; 7 pages, 5 figures
标签

quantum simulation topological order
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