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arXiv 1406.2669cond-mat.quant-gasquant-ph
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费米子原子金属多体态相干猝灭动力学的观测

Observation of coherent quench dynamics in a metallic many-body state of fermionic atoms

Sebastian Will, Deepak Iyer, Marcos Rigol

摘要:

超冷原子的量子模拟已成为深入研究相互作用多体系统的一种强有力的技术。特别是,研究非平衡动力学的可能性为理解强相互作用量子物质中的关联和激发提供了一条独特的途径。到目前为止,相干非平衡动力学仅在玻色子原子的超冷多体系统中观察到。本文报道了费米子原子相干猝灭动力学的观测结果。在浅三维光晶格中制备了金属态的超冷自旋极化费米子和玻色-爱因斯坦凝聚体。在抑制费米子和玻色子的晶格位置之间的隧道效应的淬火后,我们观察到费米子动量分布中的长寿命相干振荡,其周期仅由费米-玻色相互作用能量确定。我们的结果表明,相干猝灭动力学可以作为一个敏感的探针,在离域的费米量子态的相关性和量子精密测量。

英文摘要:

Quantum simulation with ultracold atoms has become a powerful technique to gain insight into interacting many-body systems. In particular, the possibility to study nonequilibrium dynamics offers a unique pathway to understand correlations and excitations in strongly interacting quantum matter. So far, coherent nonequilibrium dynamics has exclusively been observed in ultracold many-body systems of bosonic atoms. Here we report on the observation of coherent quench dynamics of fermionic atoms. A metallic state of ultracold spin-polarised fermions is prepared along with a Bose-Einstein condensate in a shallow three-dimensional optical lattice. After a quench that suppresses tunnelling between lattice sites for both the fermions and the bosons, we observe long-lived coherent oscillations in the fermionic momentum distribution, with a period that is determined solely by the Fermi-Bose interaction energy. Our results show that coherent quench dynamics can serve as a sensitive probe for correlations in delocalised fermionic quantum states and for quantum metrology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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