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arXiv 2301.11550cond-mat.mtrl-sci
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CoTe2中高各向异性体色散和自旋极化拓扑表面态的观测

Observation of highly anisotropic bulk dispersion and spin-polarized topological surface states in CoTe2

Atasi Chakraborty, Jun Fujii, Chia-Nung Kuo, Chin Shan Lue, Antonio Politano, Ivana Vobornik, Amit Agarwal

摘要:

我们提出CoTe2作为一个新的II型狄拉克半金属支持洛伦兹对称性违反狄拉克费米子附近的费米能量。通过结合第一性原理从头计算与实验角度分辨光电子能谱的结果,我们表明CoTe2主机的II型狄拉克费米子约90毫电子伏以上的费米能量。除了体狄拉克费米子,我们发现几个拓扑带反转散装CoTe 2,这使得产生一个阶梯的自旋极化表面态在很宽的能量范围。与通常显示Rashba型面内自旋分裂的表面态相比,我们发现CoTe2也具有新颖的面外自旋极化。我们的工作建立CoTe 2作为一个潜在的候选人的狄拉克费米学和自旋电子器件,红外等离子体,超快光电子学的应用探索。

英文摘要:

We present CoTe2 as a new type-II Dirac semimetal supporting Lorentz symmetry violating Dirac fermions in the vicinity of the Fermi energy. By combining first principle ab-initio calculations with experimental angle-resolved photo-emission spectroscopy results, we show the CoTe2 hosts a pair of type-II Dirac fermions around 90 meV above the Fermi energy. In addition to the bulk Dirac fermions, we find several topological band inversions in bulk CoTe2, which gives rise to a ladder of spin-polarized surface states over a wide range of energies. In contrast to the surface states which typically display Rashba-type in-plane spin splitting, we find that CoTe2 hosts novel out-of-plane spin polarization as well. Our work establishes CoTe2 as a potential candidate for the exploration of Dirac fermiology and applications in spintronic devices, infrared plasmonics, and ultrafast optoelectronics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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