报告题目：Thermal Hall Effect as a Probe of Quantum Materials: Phonon Intrinsic Mechanisms and Multigap Superconductivity
报 告 人：朱增伟
报告时间：2026年11月12日10:00
报告地点：物理楼W105会议室
内容摘要：The thermal Hall effect (THE) has emerged as a sensitive probe of charge-neutral excitations and multiband quasiparticle transport. This talk focuses on my group's recent progress on the intrinsic phonon THE mechanisms [1,2,3,4,5] and extends to electronic quasiparticle THE in multigap superconductors [6]. In NiPS3, the thermal Hall conductivity correlates with in-plane magnetic anisotropy rather than the phonon mean free path; combined with magnon–phonon band crossings, this supports an intrinsic phonon THE associated with magnon–phonon hybridization [2]. The similarity in the thermal Hall angle between NiPS₃, Na₂Co₂TeO₆ and α-RuCl₃—all sharing a honeycomb lattice and zigzag magnetic order—despite orders-of-magnitude differences in their phonon mean free paths, demonstrates that the details of phonon-magnetic excitation coupling influence κxx and κxy, but not the thermal Hall angle. In La4Ni3O10, density-wave order strongly enhances the phonon THE, with the thermal Hall angle reaching nearly 7% [3]. In WS2 and LiNbO3, the thermal Hall resistivity scales with the binding energy density once phonon–phonon interactions are taken into account, while the peak thermal Hall angle approaches a common upper bound [4,5]. As a contrast, the THE in Nb probes electronic quasiparticles, revealing a hole-like to electron-like crossover and a small gap of about 0.22 kBTc from two-gap BRT analysis, establishing Nb as a two-gap superconductor [6]. In graphite, the thermal Hall conductivity far exceeds the Wiedemann–Franz expectation, with a Hall Lorenz number of about 67 L0, indicating ambipolar phonon drag [7].
[1] X. Li*, ZZ*, K. Behina* et al., Nat.Commun.14, 1027 (2023); X. Li*, ZZ*, K. Behina*, Science Bulletin 70, 1962 (2025)
[2] Q. Meng, X. Li*, ZZ*, L. Li*, K. Behina* et al., Science 394, 419 (2026)
[3] Q. Xiang X. Li*, J. Zhao*, G. Zhang*, L. Li,*, ZZ* et al., arXiv:2606.24125 (2026).
[4] X. Guo, X. Li*, ZZ*, K. Behina* et al., arXiv:2604.03644 (2026).
[5] K. Behnia and ZZ, Physics, 19, 122 (2026)
[6] J. Zhang, ZZ*, et al., arXiv:2609.15663 (2026).
[7] Q. Xiang, X. Li*, ZZ*, K. Behina* et al., Phys. Rev. Lett. 136, 056303 (2026).
报告人简介：朱增伟，华中科技大学教授，2009年获浙江大学博士学位。2010年2月至2012年6月，在法国巴黎高等物理化工学院（ESPCI）从事半金属输运方向的博士后研究。随后，2012年10月至2014年6月，在美国洛斯阿拉莫斯国家实验室获得主任基金资助开展博士后研究，主要研究脉冲强磁场下的输运性质。2014年入选“青年千人计划”，加入华中科技大学国家脉冲强磁场科学中心（WHMFC）。主要集中于强磁场低温下量子材料的电输运和热输运效应的研究。加入华中科技大学以来，以（共同）通讯作者或第一作者身份在Science, Physical Review X、Physical Review Letters、Nature Communications、PNAS、Science Advances等知名期刊上发表多篇论文。
