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Magnetic topological insulator MnBi_6Te_(10) with a zero-field ferromagnetic state and gapped Dirac surface states

机译:磁性拓扑绝缘体Mnbi_6te_(10)具有零场铁磁状态和盖缝灯表面状态

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摘要

Magnetic topological insulators (TIs) with nontrivial topological electronic structure and broken time-reversal symmetry exhibit various exotic topological quantum phenomena. The realization of such exotic phenomena at high temperature is one of the central topics in this area. We reveal that MnBi_6Te_(10) is a magnetic TI with an antiferromagnetic ground state below 10.8 K whose nontrivial topology is manifested by Dirac-like surface states. The ferromagnetic axion insulator state with Z_4 = 2 emerges once spins are polarized at a field as low as 0.1 T, accompanied with saturated anomalous Hall resistivity up to 10 K. Such a ferromagnetic state is preserved even with an external field down to zero at 2 K. Theoretical calculations indicate that the few-layer ferromagnetic MnBi_6Te_(10) is also topologically nontrivial with a nonzero Chern number. Angle-resolved photoemission spectroscopy experiments further reveal three types of Dirac surface states arising from different terminations on the cleavage surfaces, one of which has insulating behavior with an energy gap of ~28 meV at the Dirac point. These outstanding features suggest that MnBi_6Te_(10) is a promising system to realize various topological quantum effects at zero field and high temperature.
机译:磁性拓扑绝缘体(TIS)具有非拓扑电子结构和破裂的时间反转对称性表现出各种外来拓扑量子现象。在高温下实现这种异国现象是该地区的中心主题之一。我们揭示了Mnbi_6te_(10)是具有低于10.8k的反铁磁性接地状态的磁性Ti,其非活动拓扑结构由狄拉氏表面状态表现出。用Z_4 = 2的铁磁轴绝缘子状态一旦旋转在低至0.1t的场上偏振,伴随着高达10k的饱和异常霍尔电阻率。即使在2的外部场下,也保持了这种铁磁状态。 K.理论计算表明,几层铁磁Mnbi_6te_(10)也与非零号码拓扑非拓扑。角度分辨的光曝光光谱实验进一步揭示了从裂解表面上不同终端产生的三种类型的DiRAC表面状态,其中一个是具有〜28mev的绝缘行为在DIRAC点处具有〜28mev的绝缘行为。这些突出的功能表明MNBI_6TE_(10)是一个有希望的系统,实现零场和高温下的各种拓扑量子效应。

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  • 来源
    《Physical review》 |2020年第3期|035144.1-035144.7|共7页
  • 作者单位

    Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University of China Beijing 100872 China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China;

    Department of Materials Science and Engineering Stanford University Stanford California 94305 USA;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China;

    Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University of China Beijing 100872 China;

    Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University of China Beijing 100872 China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China;

    Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277-8581 Japan;

    Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277-8581 Japan AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL) Kashiwa Chiba 277-8581 Japan;

    Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277-8581 Japan AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL) Kashiwa Chiba 277-8581 Japan;

    MAX Ⅳ Laboratory Lund University P.O. Box 118 221 00 Lund Sweden;

    MAX Ⅳ Laboratory Lund University P.O. Box 118 221 00 Lund Sweden;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100049 China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China;

    Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University of China Beijing 100872 China;

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