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Topological chiral crystals with helicoid-arc quantum states

机译：具有螺旋弧形量子态的拓扑手性晶体

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摘要

The quantum behaviour of electrons in materials is the foundation of modern electronics and information technology(1-11), and quantum materials with topological electronic and optical properties are essential for realizing quantized electronic responses that can be used for next generation technology. Here we report the first observation of topological quantum properties of chiral crystals(6,7) in the RhSi family. We find that this material class hosts a quantum phase of matter that exhibits nearly ideal topological surface properties originating from the crystals' structural chirality. Electrons on the surface of these crystals show a highly unusual helicoid fermionic structure that spirals around two high-symmetry momenta, indicating electronic topological chirality. The existence of bulk multiply degenerate band fermions is guaranteed by the crystal symmetries; however, to determine the topological invariant or charge in these chiral crystals, it is essential to identify and study the helicoid topology of the arc states. The helicoid arcs that we observe on the surface characterize the topological charges of +/- 2, which arise from bulk higher-spin chiral fermions. These topological conductors exhibit giant Fermi arcs of maximum length (pi), which are orders of magnitude larger than those found in known chiral Weyl fermion semimetals(5,8-11). Our results demonstrate an electronic topological state of matter on structurally chiral crystals featuring helicoid-arc quantum states. Such exotic multifold chiral fermion semimetal states could be used to detect a quantized photogalvanic optical response, the chiral magnetic effect and other optoelectronic phenomena predicted for this class of materials(6).
机译：材料中电子的量子行为是现代电子和信息技术的基础（1-11），具有拓扑电子和光学特性的量子材料对于实现可用于下一代技术的量化电子响应至关重要。在这里，我们报道了RhSi家族中手性晶体（6,7）的拓扑量子性质的首次观察。我们发现，这种材料类别承载着一个物质的量子相，该相表现出源自晶体的结构手性的近乎理想的拓扑表面特性。这些晶体表面上的电子显示出高度不寻常的螺旋铁氧体结构，该结构围绕两个高对称动量螺旋旋转，表明电子拓扑手性。晶体对称性保证了本体倍增简并带费曼子的存在。但是，要确定这些手性晶体的拓扑不变性或电荷，必须确定和研究电弧态的螺旋状拓扑。我们在表面上观察到的螺旋弧表示+/- 2的拓扑电荷，该电荷是由大量高自旋手性费米子产生的。这些拓扑导体表现出最大长度（pi）的巨型费米弧，比已知的手性Weyl费米半金属（5,8-11）所发现的费米弧大几个数量级。我们的结果表明，在具有手性的弧形量子态的结构手性晶体上，物质的电子拓扑态。这种奇异的多重手性费米子半金属态可用于检测针对此类材料预测的定量光电化学光学响应，手性磁效应和其他光电现象（6）。

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  • 来源
    《Nature》 |2019年第7749期|500-505|共6页
  • 作者

    Sanchez Daniel S.; Belopolski Ilya; Cochran Tyler A.; Xu Xitong; Yin Jia-Xin; Chang Guoqing; Xie Weiwei; Manna Kaustuv; Suss Vicky; Huang Cheng-Yi; Alidoust Nasser; Multer Daniel; Zhang Songtian S.; Shumiya Nana; Wang Xirui; Wang Guang-Qiang; Chang Tay-Rong; Felser Claudia; Xu Su-Yang; Jia Shuang; Lin Hsin; Hasan M. Zahid;

  • 作者单位

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA;

    Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing, Peoples R China;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA;

    Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA;

    Max Planck Inst Chem Phys Solids, Dresden, Germany;

    Max Planck Inst Chem Phys Solids, Dresden, Germany;

    Acad Sinica, Inst Phys, Taipei, Taiwan;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA|Rigetti Quantum Comp, Berkeley, CA USA;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA|Princeton Univ, Dept Chem, Princeton, NJ 08544 USA;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA;

    Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing, Peoples R China;

    Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing, Peoples R China;

    Natl Cheng Kung Univ, Dept Phys, Tainan, Taiwan;

    Max Planck Inst Chem Phys Solids, Dresden, Germany;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA;

    Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing, Peoples R China|Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China|Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing, Peoples R China;

    Acad Sinica, Inst Phys, Taipei, Taiwan;

    Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA|Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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