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Crystal growth and quantum oscillations in the topological chiral semimetal CoSi

机译：拓扑手性半型宇宙中的晶体生长和量子振荡

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摘要

We survey the electrical transport properties of single-crystalline, topological chiral semimetal CoSi grown via different methods. High-quality CoSi single crystals were found in the growth from a tellurium solution. The sample's high carrier mobility enables us to observe quantum oscillations (QOs) in its thermoelectrical signals. Our analysis of QOs reveals two spherical Fermi surfaces around the R point in its Brillouin zone corner. The extracted Berry phases of these electron orbits are consistent with the -2 chiral charge as reported in density functional theory (DFT) calculations. A detailed analysis of the QOs reveals that the spin-orbit-coupling-induced band splitting is less than 2 meV near the Fermi level, one order of magnitude smaller than our DFT calculation. We also report a large phonon-drag-induced Nernst effect in CoSi at intermediate temperatures.
机译：我们通过不同方法调查单晶的电气传输性能，拓扑手性半符合康西生长。在碲溶液的生长中发现了高质量的Cosi单晶。样本的高载波移动性使我们能够在其热电信号中观察量子振荡（QoS）。我们对QoS的分析揭示了在布里渊区角落的R点周围的两个球形费米表面。这些电子轨道的提取的浆浆阶段与密度函数理论（DFT）计算中报告的-2手性电荷一致。对QoS的详细分析表明，旋转轨道耦合诱导的带分裂小于FERMI水平附近的2meV，比我们的DFT计算小一个数量级。我们还在中间温度下报告了Cosi中的大声响起诱导的内部效应。

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  • 来源
    《Physical review》 |2019年第4期|045104.1-045104.9|共9页
  • 作者

    Xu Xitong; Wang Xirui; Cochran Tyler A.; Sanchez Daniel S.; Chang Guoqing; Belopolski Ilya; Wang Guangqiang; Liu Yiyuan; Tien Hung-Ju; Gui Xin; Xie Weiwei; Hasan M. Zahid; Chang Tay-Rong; Jia Shuang;

  • 作者单位

    Peking Univ Int Ctr Quantum Mat Sch Phys Beijing 100871 Peoples R China;

    Peking Univ Int Ctr Quantum Mat Sch Phys Beijing 100871 Peoples R China;

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

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

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

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

    Peking Univ Int Ctr Quantum Mat Sch Phys Beijing 100871 Peoples R China;

    Peking Univ Int Ctr Quantum Mat Sch Phys Beijing 100871 Peoples R China;

    Natl Cheng Kung Univ Dept Phys Tainan 701 Taiwan;

    Louisiana State Univ Dept Chem Baton Rouge LA 70803 USA;

    Louisiana State Univ Dept Chem Baton Rouge LA 70803 USA;

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

    Natl Cheng Kung Univ Dept Phys Tainan 701 Taiwan|Ctr Quantum Frontiers Res & Technol QFt Tainan 701 Taiwan;

    Peking Univ Int Ctr Quantum Mat Sch Phys Beijing 100871 Peoples R China|Collaborat Innovat Ctr Quantum Matter Beijing 100871 Peoples R China|Univ Chinese Acad Sci CAS Ctr Excellence Topol Quantum Computat Beijing 100190 Peoples R China|Beijing Acad Quantum Informat Sci West Bldg 3 10 Xibeiwang East Rd Beijing 100193 Peoples R China;

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