Nonequilibrium quantum many-body dynamics of hybrid atom-optomechanical condensate systems

混合原子光机械凝聚系统的非平衡量子多体动力学

• 批准号: 274978739
• 负责人: Professor Dr. Michael Thorwart
• 金额: --
• 依托单位: I. Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/274978739?language=en
• 关键词: Nonequilibrium; quantum; many; body; dynamics

In this project, we are interested in an exotic quantum state of matter, which we foresee to exist in the form of a supersolid in a hybrid atom-optomechanical system of an ultracold atom gas coupled via light to the quantum motion of a nanomechanical oscillator. The supersolid state of this hybrid quantum many-body systems is expected in the form of quantum droplets in the atom gas, shown by spontaneous density modulations in the gas. The droplets are quantum coherent macroscopic objects. The formation of quantum droplets requires either a mixture of Bose gases or an intrinsic long-range interaction between the atoms. In a hybrid atom-optomechanical systems in the internal-state coupling configuration, both ingredients are present at the same time. The coherent long-range interaction is induced by the coupling to the mechanical oscialltor. The hybrid quantum system could provide an efficient platform to realize such a supersolid state, also with the particularly interesting aspect that this exotic quantum many-body state is triggered by a macroscopic nanomechanical oscillator which is itself in a trivial classical solid state of matter, albeit its dynamics occurs in a quantum coherent nanomechanical mode. From a fundamental point of view, a supersolid and the appearance of quantum droplets are a clear manifestation of the quantum many-body character of the system which goes far beyond a common mean-field picture.

在这个项目中，我们对物质的奇异量子态感兴趣，我们预见它将以超固体的形式存在于超冷原子气体通过光耦合到纳米机械振荡器的量子运动的混合原子光学机械系统中。这种混合量子多体系统的超固态预计将以原子气体中的量子液滴的形式出现，并通过气体中的自发密度调制来显示。液滴是量子相干的宏观物体。量子液滴的形成需要玻色气体的混合物或原子之间的内在长程相互作用。在内态耦合组态的混合原子光机系统中，两种成分同时存在。相干长程相互作用是由与机械振荡器的耦合引起的。 混合量子系统可以提供一个有效的平台来实现这样的超固态，也具有特别有趣的方面，即这种奇异的量子多体状态是由宏观纳米机械振荡器触发的，该振荡器本身处于平凡的经典固态物质中，尽管其动力学发生在量子相干纳米机械模式中。 从基本的观点来看，超固体和量子液滴的出现清楚地表明了系统的量子多体特征，这远远超出了普通的平均场图像。