【直播】【复旦理论物理报告会】复旦大学阮威研究员：单层1T-TaSe₂材料中量子自旋液体的成像研究

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本次报告由复旦大学物理系主办，于2021年10月29日9:30开始，授权蔻享学术进行网络直播。

单层1T-TaSe₂材料中量子自旋液体的成像研究

报告人

阮威（复旦大学）

时间

2021年10月29日 9:30

报告摘要

Quantum spin liquids (QSLs) are a novel state of matter predicted to arise in quantum antiferromagnets where magnetic frustration or quantum fluctuations are strong enough to prevent magnetically ordered states even down to the lowest temperatures. QSLs are believed to exist in strongly correlated Mott insulators, and are thus related to unconventional superconductivity. Much work on QSLs has focused on triangular lattices where frustration is strong. An example is the bulk Mott insulator 1T-TaS₂ which has attracted attention as a QSL candidate due to localized d-orbitals in the Ta atoms that form a triangular lattice in this material. This scenario, however, is complicated by interlayer coupling and possible different stacking orders in the bulk, thus motivating investigation into related single-layer materials. In this talk I will discuss our studies on single-layer (SL) 1T-TaSe₂ that provide evidence for 2D QSL behavior. We have characterized the electronic structure of SL molecular-beam-epitaxial grown 1T-TaSe₂ supported on graphene/SiC and graphite substrates, by means of scanning tunneling microscopy/spectroscopy (STM/STS). We observe Mott insulating behavior in SL 1T-TaSe₂, in good agreement with the results of angle-resolved photoemission spectroscopy and first-principles calculation. Vertical heterostructures formed by a single 1T-TaSe₂ layer placed on top of metallic 1H-TaSe₂ exhibit Kondo behavior, providing direct evidence for a triangular array of local spins in SL 1T-TaSe₂, a prerequisite for the QSL behavior. Moreover, in SL 1T-TaSe₂ we observe long-wavelength super-modulations that are explained quantitatively by a QSL-based spinon Fermi surface instability.

报告人介绍

图 | 阮威

阮威，2010年本科毕业于清华大学物理系，2017年在清华大学物理系获得理学博士学位，2017至2020年在加州大学伯克利分校物理系从事博士后研究，2021年加入复旦大学物理系任青年研究员。长期利用扫描隧道显微镜从事强关联电子体系、低维量子材料等相关实验研究，包括高温超导、近藤绝缘体、量子自旋液体、拉廷格液体等。在Nature Physics等学术期刊上共发表论文20篇，总引用2100余次。

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复旦大学物理系理论物理报告会

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