Magneto-optic Kerr Effect Measurement of TbMn_(6)Sn_(6) at mK Temperature  

作　　者：黄代强 汪洋 王贺 王健 刘阳 Dai-Qiang Huang;Yang Wang;He Wang;Jian Wang;Yang Liu(International Center for Quantum Materials,Peking University,Beijing 100871,China;Department of Physics,Capital Normal University,Beijing 100048,China;Collaborative Innovation Center of Quantum Matter,Beijing 100871,China;Hefei National Laboratory,Hefei 230088,China)

机构地区：[1]International Center for Quantum Materials,Peking University,Beijing 100871,China [2]Department of Physics,Capital Normal University,Beijing 100048,China [3]Collaborative Innovation Center of Quantum Matter,Beijing 100871,China [4]Hefei National Laboratory,Hefei 230088,China

出　　处：《Chinese Physics Letters》2024年第4期159-163,共5页中国物理快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant Nos.2021YFA1401900,2019YFA0308403,and 2018YFA0305604);the Innovation Program for Quantum Science and Technology(Grant Nos.2021ZD0302602 and 2021ZD0302403);the National Natural Science Foundation of China(Grant Nos.92065104,12074010,and 11888101);Capacity Building for Sci-Tech Innovation-Fundamental Scientific Research Funds(Grant Nos.20530290057 and KM202010028014)。

摘　　要：Novel electron states stabilized by Coulomb interactions attract tremendous interests in condensed matter physics.These states are studied by corresponding phase transitions occurring at extreme conditions such as mK temperatures and high magnetic field.In this work,we introduce a magneto-optical Kerr effect measurement system to comprehensively explore these phases in addition to conventional transport measurement.This system,composed of an all-fiber zero-loop Sagnac interferometer and in situ piezo-scanner inside a dilution refrigerator,operates below 100 m K,with a maximum field of 12 Tesla and has a resolution as small as 0.2μrad.As a demonstration,we investigate TbMn_(6)Sn_(6),where the manganese atoms form Kagome lattice that hosts topological non-trivial Dirac cones.We observed two types of Kerr signals,stemming from its fully polarized ferromagnetic ground state and positive charged carriers within the Dirac-like dispersion.

关 键 词：INTERFEROMETER SCANNER system 

分 类 号：O469[理学—凝聚态物理]