Towards low-dimensional Bose-Fermi mixtures on a microchip

微芯片上的低维玻色-费米混合物

• 批准号: EP/K023624/1
• 负责人: Lucia Hackermueller
• 金额: $ 11.79万
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2013
• 资助国家: 英国
• 起止时间: 2013 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FK023624%2F1
• 关键词: Towards; low; dimensional; Bose; Fermi

Atoms at ultra-low temperatures form degenerate quantum states, depending on their spin either a Bose-Einstein-Condensate or a degenerate Fermi gas. Bose-Einstein-Condensation occurs when the wavelength of an individual atom becomes comparable to the distance between the atoms and the behaviour of the ensemble is therefore dictated by the wave. This is a premier example for the predictions of quantum mechanics. As a form of an extreme many body system, degenerate quantum gases are fascinating on their own and provide insight into the fundamental building blocks of our world. Because we can control these systems comparatively easily they are also extremely useful to study and model other systems, which are less well controlled or more difficult to access. Examples are the still open problem of high-temperature superconductivity, the physics of neutron stars, analogue models for gravity or modelling of a black hole and Hawking radiation. The notation of an analogue quantum simulator was formed by Richard Feynman, where he proposed that instead of trying to theoretically predict the behaviour of a complex system one could model model its behaviour with another quantum system. Such a simulator would exactly be implemented by a cold atoms mixture experiment. We propose here to study mixtures of two ultracold species formed from bosonic (caesium, with integer spin) and fermionic (lithium, with half-integral spin) atoms. This will allow for the first time the study of one-dimensional fermionic atoms (similar to electrons in a solid) in a degenerate superfluid background (similar to the phonons in a crystal). We will implement these systems on a micro-chip, which provides a particularly stable and reliable environment for studying ultracold quantum gases.For these and related experiments it will also be relevant to know the interactions between the two sorts of atoms, which we will map out over a large range of magnetic-fields. For atom-atom interactions a so-called Feshbach-resonance can exist, which enables tuning of the interaction strength from strongly attractive to non-interacting and to strongly repulsive, knowing the position and shape of this resonance is therefore of great importance.Because one species can act as the background medium for the other, this system is also extremely well-suited to the investigation of transport and non-equilibrium physics in low-dimensions. The importance of understanding these phenomena has been highlighted in EPSRC's Physics Grand Challenges.

原子在超低温下形成简并量子态，取决于它们的自旋是玻色-爱因斯坦凝聚态还是简并费米气体。当单个原子的波长变得与原子之间的距离相当时，就会发生玻色-爱因斯坦凝聚，因此系综的行为由波决定。这是量子力学预言的一个重要例子。作为极端多体系统的一种形式，简并量子气体本身就很吸引人，并为我们世界的基本组成部分提供了见解。因为我们可以相对容易地控制这些系统，所以它们对于研究和建模其他系统也非常有用，这些系统控制得不好或更难访问。例如，高温超导性、中子星物理学、重力模拟模型或黑洞模型以及霍金辐射等尚未解决的问题。模拟量子模拟器的符号是由理查德·费曼（Richard Feynman）提出的，他提出，与其试图从理论上预测一个复杂系统的行为，不如用另一个量子系统来模拟它的行为。这样的模拟器可以通过冷原子混合实验来实现。在这里，我们建议研究两种超冷物质的混合物形成玻色子（铯，整数自旋）和费米（锂，半整数自旋）原子。这将首次允许在简并超流体背景（类似于晶体中的声子）中研究一维费米原子（类似于固体中的电子）。我们将在微芯片上实现这些系统，这为研究超冷量子气体提供了一个特别稳定和可靠的环境。对于这些和相关的实验，了解这两种原子之间的相互作用也是相关的，我们将在大范围的磁场中绘制出来。对于原子-原子相互作用，存在所谓的Feshbach共振，它可以将相互作用强度从强吸引力调整到非相互作用和强排斥力，因此知道这种共振的位置和形状非常重要。因为一种物质可以作为另一种物质的背景介质，该系统也非常适合于研究低维中的输运和非平衡物理。理解这些现象的重要性已经在EPSRC的物理学大挑战中得到了强调。

项目成果

Additively manufactured ultra-high vacuum chamber below 10-10 mbar

增材制造低于 10-10 mbar 的超高真空室

• 发表时间: 2019
• 期刊: www.arxiv.org
• 作者: Nathan Cooper, N.C.

Cold atoms in micromachined waveguides: A new platform for atom-photon interactions

• DOI: 10.1103/physrevresearch.2.033098
• 发表时间: 2020-07-17
• 期刊: PHYSICAL REVIEW RESEARCH
• 影响因子: 4.2
• 作者: Da Ros, E.;Cooper, N.;Hackermueller, L.
• 通讯作者: Hackermueller, L.

Gravity in the quantum lab

• DOI: 10.1080/23746149.2017.1383184
• 发表时间: 2018-01-01
• 期刊: ADVANCES IN PHYSICS-X
• 影响因子: 6
• 作者: Howl, Richard;Hackermueller, Lucia;Fuentes, Ivette
• 通讯作者: Fuentes, Ivette

Enhanced magnetoassociation of 6Li in the quantum degenerate regime

量子简并态下 6Li 的增强磁缔合

• 发表时间: 2021
• 期刊: www.arxiv.org
• 作者: Naniyil, V. N.

Dual-frequency spectroscopy for compact systems and enhanced laser stabilisation

• 发表时间: 2021
• 作者: N. Cooper;S. Madkhaly;David Johnson;D. Baldolini;Lúcia;Hackermüller