旋转环晶格中的宏观叠加态
Macroscopic superposition states in rotating ring lattices
摘要：
研究了转动对光学环晶格中一维超冷玻色子的影响。首先，我们证明了存在一个临界旋转频率，在该频率下，弱相互作用的整数填充原子气体的基态被碎裂成具有不同环流的宏观叠加态。其次，我们指出了使用轻微的非均匀环格的几个优点。最后，我们证明了不同的准动量状态可以区分在飞行时间吸收成像，并建议探测相关性通过多体振荡引起的突然变化的旋转频率。
英文摘要：
We investigate the effects of rotation on one-dimensional ultracold bosons confined to optical ring lattices. First, we show that there exists a critical rotation frequency at which the ground state of a weakly-interacting and integer-filled atomic gas is fragmented into a macroscopic superposition state with different circulation. Second, we point out several advantages of using slightly non-uniform ring lattices. Finally, we demonstrate that different quasi-momentum states can be distinguished in time-of-flight absorption imaging and propose to probe correlations via the many-body oscillations induced by a sudden change in the rotation frequency.
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