近日，安徽大学的孙学峰与中国科学技术大学的赵霞合作并取得一项新进展。他们对量子自旋候选液体中的超低温热输运进行了简要回顾。相关研究成果已于2024年12月17日在《中国物理快报》上发表。

本综述总结了从不同量子自旋液体（QSL）候选材料中得出的关键热导率发现，重点探讨了自旋子在热传输和声子散射中的作用。研究人员还研究了具有三维烧绿石结构以及二维蜂窝状和三角形晶格结构的，QSL候选材料中的不同实验观测结果，及其热霍尔效应（THE）的潜在机制。本综述为理解QSL中的超低温热传输提供了宝贵的见解和指导。

据悉，固体中的热量可以通过各种准粒子进行传输，这使得低温热传输成为，探测量子材料中电荷中性激发态的有力工具。近年来，超低温热传输在探测量子自旋液体（QSLs）中的奇异激发态方面，发挥了重要作用。非零残余热导率κ₀/T有力地证明了流动自旋子和无序状态无带隙特性的存在。此外，量子自旋液体中的热霍尔效应（THE），可能源自自旋子或马约拉纳费米子的贡献。

附：英文原文

Title: Ultralow-Temperature Heat Transport in Quantum Spin Liquid Candidates: A Brief Review

Author:Na Li(李娜), Xia Zhao(赵霞), and Xue-Feng Sun(孙学峰)

Issue&Volume: 2024-12-17

Abstract: Heat in solids can be transported by various quasiparticles, making low-temperature heat transport a powerful tool for probing charge-neutral excitations in quantum materials. In recent years, ultralow-temperature heat transport has been instrumental in detecting exotic excitations in quantum spin liquids (QSLs). A non-zero residual thermal conductivity, κ₀/T, serves as compelling evidence for the presence of itinerant spinons and the gapless nature of a disordered state. Additionally, the thermal Hall effect (THE) in QSLs can arise from contributions by spinons or Majorana fermions. In this review, we summarize key thermal conductivity findings from various QSL candidates, focusing on the role of spinons in both heat transport and phonon scattering. We also examine different experimental observations and the underlying mechanisms of THE in QSL candidates with three-dimensional pyrochlore structures, as well as two-dimensional honeycomb and triangular lattices. This review offers valuable insights and guidance for understanding ultralow-temperature heat transport in QSLs.

DOI: 10.1088/0256-307X/41/12/127501

Source: https://cpl.iphy.ac.cn/10.1088/0256-307X/41/12/127501