Light-Induced Hofstadter's Butterfly Spectrum in Optical Lattices

• 来源期刊: 理论物理通讯（英文版）
• 年，卷（期）: 2009,（3）
• 页码范围: 441-444
• 页数: 4页
• 语种: 英文

摘要

We propose a scheme to create an effective magnetic field, which can be perceived by cold neutral atoms in a two-dimensional optical lattice, with a laser field with a space-dependent phase and a conventional laser field acting on A-type three-level atoms. When the dimensionless parameter α, being the ratio of flux through a lattice cell to one flux quantum, is rational, the energy spectrum shows a fractal band structure, which is so-called Hofstadter's butterfly.