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Changes of Fermi surface topology due to the rhombohedral distortion in SnTe

机译：由于SNTE中的菱形畸变导致FERMI表面拓扑的变化

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摘要

Stoichiometric SnTe is theoretically a small gap semiconductor that undergoes a ferroelectric distortion on cooling. In reality however, crystals arc always nonstoichiometric and metallic; the ferroelectric transition is therefore, more accurately described as a polar structural transition. Here, we study the Fermi surface using quantum oscillations as a function of pressure. We find the oscillation spectrum changes at high pressure due to the suppression of the polar transition and less than 10 kbars is sufficient to stabilize the undistorted cubic lattice, this is accompanied by a large decrease in the Hall and electrical resistivities. Combined with our density functional theory calculations and angle-resolved pholoemission spectroscopy measurements, this suggests the Fermi surface L pockets have lower mobility than the tubular Fermi surfaces that connect them. Additionally, we find the unusual phenomenon of a linear magnetoresistance that exists irrespective of the distortion that we attribute to regions of the Fermi surface with high curvature.
机译：化学计量SNTE是理论上是一个小间隙半导体，经历冷却时的铁电畸变。然而，实际上，晶体总是弧形不间断和金属;因此，铁电转变更精确地描述为极性结构转变。在这里，我们使用量子振荡作为压力的函数来研究Fermi表面。我们发现由于抑制极性过渡而在高压下的振荡谱变化，并且少于10克尔足以稳定未变形的立方格格子，这伴随着霍尔和电阻的大幅减少。结合我们的密度函数理论计算和角度分辨的Pholoemision光谱测量，这表明Fermi表面L口袋的迁移率比连接它们的管状费米表面更低。另外，我们发现与具有高曲率的费米表面区域的变形无关存在的线性磁阻的不寻常现象。

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  • 来源
    《Physical review》 |2020年第15期|155132.1-155132.8|共8页
  • 作者

    Christopher D. ONeill; Oliver J. Clark; Harry D. J. Keen; Federico Mazzola; Igor Markovic; Dmitry A. Sokolov; Andreas Malekos; Phil D. C. King; Andreas Hermann; Andrew D. Huxley;

  • 作者单位

    Centre for Science at Extreme Conditions and SUPA School of Physics and Astronomy University of Edinburgh Edinburgh EH9 3JZ United Kingdom;

    School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom;

    Centre for Science at Extreme Conditions and SUPA School of Physics and Astronomy University of Edinburgh Edinburgh EH9 3JZ United Kingdom;

    School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom;

    School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany;

    Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany;

    Centre for Science at Extreme Conditions and SUPA School of Physics and Astronomy University of Edinburgh Edinburgh EH9 3JZ United Kingdom;

    School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom;

    Centre for Science at Extreme Conditions and SUPA School of Physics and Astronomy University of Edinburgh Edinburgh EH9 3JZ United Kingdom;

    Centre for Science at Extreme Conditions and SUPA School of Physics and Astronomy University of Edinburgh Edinburgh EH9 3JZ United Kingdom;

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