Discovering and understanding quantum spin liquids

发现和理解量子自旋液体

基本信息

  • 批准号:
    RGPIN-2018-06118
  • 负责人:
  • 金额:
    $ 2.55万
  • 依托单位:
  • 依托单位国家:
    加拿大
  • 项目类别:
    Discovery Grants Program - Individual
  • 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

项目摘要

Frustrated magnets are materials that have competing interactions between their electron spins, destabilizing conventional magnetic order and leading to various exotic phases that provide an ideal setting for studying emergent properties. When quantum fluctuations are large enough (typical of spin-1/2 moments), the spins can become highly quantum entangled and form what is known as a quantum spin liquid. This fascinating state of matter has a number of remarkable properties, including emergent excitations such as spinons, Majorana Fermions and magnetic monopoles.The aim of this research is to discover new quantum spin liquid materials and to better understand the materials that we have already discovered. Four short-term objectives will be pursued: (1) We will explore the interplay of charge and spin degrees of freedom in frustrated lattices (kagome and triangular) to see how this can give rise to novel spin models and new types of quantum spin liquid. (2) We will apply hydrostatic pressure to materials that are understood to be close to a quantum critical point between antiferromagnetism and spin liquidity with the aim of tipping them past that critical point and into the quantum spin liquid phase. In particular, we hope to generate an example of the coveted Kitaev QSL which has potential quantum computing applications. (3) We will develop a new method of characterizing the spin excitations in quantum spin liquid candidate materials, including the kagome system Herbertsmithite, that relies on spinon-phonon coupling, as probed by acoustic measurements (sound velocity and attenuation). In particular, we hope to determine conclusively whether there is a spin gap in Herbersmithite or not. (4) We will aim to understand whether there is an important role for quantum fluctuations in certain "classical" spin liquids. While several materials with large, navely classical spins do not order, it remains unclear whether these systems are stuck in a metastable state or whether they would in fact be best described as quantum spin liquids.This project will primarily be carried out by 7 graduate students and 5 undergraduate interns funded by this grant, as well as one postdoc funded from another source. A diverse set of research techniques will be employed in my laboratory at the Université de Sherbrooke and at user facilities around the world. In particular, we will employ nuclear magnetic resonance (NMR), muon spin rotation (µSR), thermodynamic measurements (specific heat and magnetization) and ultrasound velocity and attenuation. Many of these experiments will be carried out at very low temperatures (down to 20 mK), at high magnetic fields (up to 18 T) and under hydrostatic pressure (up to 2 GPa).
受抑磁体是在其电子自旋之间具有竞争相互作用的材料,破坏了常规磁序,并导致各种奇异相,为研究涌现特性提供了理想的环境。当量子涨落足够大时(典型的自旋1/2矩),自旋可以变得高度量子纠缠并形成所谓的量子自旋液体。这种迷人的物质状态具有许多显着的特性,包括涌现激发,如自旋子,马约拉纳费米子和磁单极子。这项研究的目的是发现新的量子自旋液体材料,并更好地理解我们已经发现的材料。我们将追求四个短期目标:(1)我们将探索阻挫晶格(kagome和三角形)中电荷和自旋自由度的相互作用,以了解这如何产生新的自旋模型和新型量子自旋液体。(2)我们将对接近反铁磁性和自旋流动性之间的量子临界点的材料施加流体静压,目的是使它们越过临界点并进入量子自旋液相。特别是,我们希望生成一个令人垂涎的Kitaev QSL的例子,它具有潜在的量子计算应用。(3)我们将开发一种新的方法来表征量子自旋液体候选材料中的自旋激发,包括kagome系统Herbertsmithite,它依赖于自旋-声子耦合,通过声学测量(声速和衰减)进行探测。特别是,我们希望最终确定是否有在Herbersmithite或没有自旋间隙。(4)我们的目标是了解量子涨落在某些“经典”自旋液体中是否有重要作用。虽然有几种具有大的、朴素的经典自旋的材料不有序,但目前还不清楚这些系统是否停留在亚稳态,或者它们是否实际上最好被描述为量子自旋液体。该项目将主要由该基金资助的7名研究生和5名本科生实习生以及另一来源资助的一名博士后进行。我在舍布鲁克大学的实验室和世界各地的用户设施将采用一套不同的研究技术。特别是,我们将采用核磁共振(NMR),μ子自旋旋转(µSR),热力学测量(比热和磁化)和超声速度和衰减。其中许多实验将在非常低的温度(低至20 mK),高磁场(高达18 T)和静水压力(高达2 GPa)下进行。

项目成果

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Quilliam, Jeffrey其他文献

Quilliam, Jeffrey的其他文献

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{{ truncateString('Quilliam, Jeffrey', 18)}}的其他基金

Discovering and understanding quantum spin liquids
发现和理解量子自旋液体
  • 批准号:
    RGPIN-2018-06118
  • 财政年份:
    2021
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Discovering and understanding quantum spin liquids
发现和理解量子自旋液体
  • 批准号:
    RGPIN-2018-06118
  • 财政年份:
    2020
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Discovering and understanding quantum spin liquids
发现和理解量子自旋液体
  • 批准号:
    RGPIN-2018-06118
  • 财政年份:
    2019
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Discovering and understanding quantum spin liquids
发现和理解量子自旋液体
  • 批准号:
    RGPIN-2018-06118
  • 财政年份:
    2018
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Studies of Quantum Magnetism with Magnetic Resonance and Thermodynamic Measurements
通过磁共振和热力学测量研究量子磁学
  • 批准号:
    436081-2013
  • 财政年份:
    2017
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Studies of Quantum Magnetism with Magnetic Resonance and Thermodynamic Measurements
通过磁共振和热力学测量研究量子磁学
  • 批准号:
    436081-2013
  • 财政年份:
    2015
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Studies of Quantum Magnetism with Magnetic Resonance and Thermodynamic Measurements
通过磁共振和热力学测量研究量子磁学
  • 批准号:
    436081-2013
  • 财政年份:
    2014
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Studies of Quantum Magnetism with Magnetic Resonance and Thermodynamic Measurements
通过磁共振和热力学测量研究量子磁学
  • 批准号:
    436081-2013
  • 财政年份:
    2013
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Discovery Grants Program - Individual
Nematic order in a highly correlated electron material
高度相关电子材料中的向列序
  • 批准号:
    388671-2010
  • 财政年份:
    2011
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Postdoctoral Fellowships
Nematic order in a highly correlated electron material
高度相关电子材料中的向列序
  • 批准号:
    388671-2010
  • 财政年份:
    2010
  • 资助金额:
    $ 2.55万
  • 项目类别:
    Postdoctoral Fellowships

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