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arXiv 1004.0701cond-mat.quant-gas
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人工规范场中原子的相互作用Hofstadter谱

Interacting Hofstadter spectrum of atoms in an artificial gauge field

Stephen Powell, Ryan Barnett, Rajdeep Sensarma, Sankar Das Sarma

摘要:

受超冷原子规范势合成实验进展的启发,我们考虑了在磁场存在下正方晶格上相互作用玻色子的超流相。我们表明,超流秩序意味着空间对称性破缺,并预测清晰的签名的多体效应的飞行时间测量。通过开发一个Bogoliubov扩展的基础上的精确的Hofstadter光谱,我们发现超流相内的准粒子模式的色散,并描述布拉格光谱测量的后果。该理论还提供了在过渡到莫特绝缘体阶段的临界相互作用强度的估计。

英文摘要:

Motivated by experimental advances in the synthesis of gauge potentials for ultracold atoms, we consider the superfluid phase of interacting bosons on a square lattice in the presence of a magnetic field. We show that superfluid order implies spatial symmetry breaking, and predict clear signatures of many-body effects in time-of-flight measurements. By developing a Bogoliubov expansion based on the exact Hofstadter spectrum, we find the dispersion of the quasiparticle modes within the superfluid phase, and describe the consequences for Bragg spectroscopy measurements. The theory also provides an estimate of the critical interaction strength at the transition to the Mott insulator phase.

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