【作者】
彭坤；
张博文；
岳伟；
冯磊；
李军亮；
于润泽；
郑晓虎；
杜瑞瑞；
【Author】
Kun Peng;Bowen Zhang;Wei Yue;Lei Feng;Junliang Li;Runze Yu;Xiaohu Zheng;Rui-Rui Du;International Center for Quantum Materials, School of Physics, Peking University;Center for High-Pressure Science and Technology Advanced Research;Beijing Academy of Quantum Information Sciences;Corrosion and Protection Center, Institute for Advanced Materials and Technology,University of Science and Technology Beijing;State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences;Hefei National Laboratory;
【通讯作者】
于润泽;郑晓虎;杜瑞瑞;
【机构】
International Center for Quantum Materials, School of Physics, Peking University；
Center for High-Pressure Science and Technology Advanced Research；
Beijing Academy of Quantum Information Sciences；
Corrosion and Protection Center, Institute for Advanced Materials and Technology,University of Science and Technology Beijing；
State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences；
Hefei National Laboratory；
【摘要】 <正>The interplay between spin and charge degrees of freedom in Mott insulators remains a central topic in strongly correlated electron systems. Using variable-temperature scanning tunneling microscopy/spectroscopy,we investigate the Van der Waals magnet RuBr3, a candidate Kitaev quantum spin liquid material. At low temperatures, RuBr3 exhibits a large correlated Mott gap exceeding 3 eV. As temperature increases, the gap softens significantly, decreasing to ??0.7 eV by 200 K. This evolution coincides with magnetic phase transitions: a sharp reduction occurs near the N??eel temperature（TN ≈ 34 K） upon loss of long-range antiferromagnetic order,followed by a gradual decline through the Kitaev paramagnetic regime. Comparison with α-RuCl3 reveals that the dominant spin correlations—whether long-range order or short-range Kitaev interactions—govern the Mott gap renormalization. Our results highlight the essential role of spin-charge coupling in Mott physics and provide key insights into the electronic behavior of Kitaev materials across different magnetic phases.更多还原
【基金】 supported by the National Natural Science Foundation of China (Grant Nos. 12474002 and 22171283 for R. Y.);the National Key Research and Development Program of China (Grant Nos. 2024YFA1409002 for R. R. D. and 2023YFA1406000 for R. Y.);the Quantum Science and Technology–National Science and Technology Major Project (Grant No. 2021ZD0302600 for R. R. D.);the Open Research Fund of State Key Laboratory of Materials for Integrated Circuits (Grant No. SKLJC-K2025-05 for X. H. Z.);the Innovation Program for Quantum Science and Technology (Grant No. 2023ZD0300500 for X. H. Z.)
