"Odd viscosity": laboratory validation of a new quantum

“奇粘度”：新量子的实验室验证

• 批准号: 577604-2022
• 负责人: Gervais, GuillaumeG
• 金额: $ 1.82万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=762253
• 关键词: Odd; viscosity; laboratory; validation; new

Viscosity, the analogue of friction in fluid dynamics, is dissipative in general but it differs in systems that have broken time-reversal symmetry, such as in some quantum fluids. In 1995 Avron, Seiler, and Zograf showed that the viscosity tensor of quantum fluids at zero temperature with an energy gap has an antisymmetric part which is entirely dissipationless, also known as "odd" or Hall viscosity. The Hall viscosity is a bulk property for which little is known. Furthermore, experimental measurements of Hall viscosity in quantum Hall states have, until now, been left untouched and remain an outstanding problem due to their complexity. This is the main objective of this work: to experimentally confirm the existence of "odd viscosity" and provide and experimental proof for an entirely new quantum. To do so, we have forged a partnership together with the FSU's national high magnetic field laboratory and we will make use of the GervaisLab unique expertise with ultra-high mobility electronic devices and Engel's their world-leading expertise with high-magnetic field capabilities to proof the existence of this entirely new quantum concept.

粘度，流体力学中摩擦的类比，通常是耗散的，但在打破时间反转对称性的系统中是不同的，例如在一些量子流体中。1995年，Avron、Seeller和Zograf证明了零温有能隙量子流体的粘性张量有一个完全无耗散的反对称部分，也称为“奇”或霍尔粘性。霍尔粘度是一种大体积性质，人们对此知之甚少。此外，到目前为止，量子霍尔态中霍尔粘度的实验测量还没有被触及，由于其复杂性，仍然是一个突出的问题。这就是这项工作的主要目的：从实验上证实“奇粘性”的存在，并为一个全新的量子提供实验证据。为此，我们与FSU的国家强磁场实验室建立了合作伙伴关系，我们将利用GervaisLab在超高迁移率电子设备方面的独特专业知识，以及Engel公司在高磁场能力方面的世界领先专业知识，来证明这一全新量子概念的存在。