Atomic-scale study of type-II Dirac semimetal PtTe2 surface

IF 2.9 4区物理与天体物理 Q2 OPTICS

Journal of Nonlinear Optical Physics & Materials Pub Date : 2022-09-30 DOI:10.1088/2515-7639/ac92a8

P. Casado Aguilar, F. Calleja, C. Kuo, C. Lue, B. Ghosh, A. Agarwal, A. Politano, A. L. Vázquez de Parga, R. Miranda, J. A. Silva-Guillén, M. Garnica

引用次数: 3

Abstract

Dirac semimetals (DSM) host linear bulk bands and topologically protected surface states, giving rise to exotic and robust properties. Platinum ditelluride (PtTe2) belongs to this interesting group of topological materials. Here, we employ scanning tunneling microscopy (STM) in combination with first-principles calculations to visualize and identify the native defects at the surface of a freshly cleaved PtTe2 crystal. Around these defects, short-wavelength electron density oscillations are observed. Fourier transform analysis of the energy-dependent quasiparticle interference patterns is in good agreement with our calculated joint density of states, demonstrating the singular properties of the surface of this type-II DSM. Our results evidence the power of STM in understanding the surface of topological materials.

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ii型Dirac半金属PtTe2表面的原子尺度研究

狄拉克半金属(DSM)具有线性体带和拓扑保护的表面状态，从而产生奇异而坚固的性能。二碲化铂(PtTe2)属于这类有趣的拓扑材料。在这里，我们使用扫描隧道显微镜(STM)结合第一性原理计算来可视化和识别新切割的PtTe2晶体表面的天然缺陷。在这些缺陷周围，观察到短波长的电子密度振荡。对能量依赖的准粒子干涉图的傅里叶变换分析与我们计算的态联合密度很好地吻合，证明了这种ii型DSM表面的奇异性。我们的结果证明了STM在理解拓扑材料表面方面的力量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Nonlinear Optical Physics & Materials 物理-光学

CiteScore

3.00

自引率

48.10%

发文量

审稿时长

3 months

期刊介绍： This journal is devoted to the rapidly advancing research and development in the field of nonlinear interactions of light with matter. Topics of interest include, but are not limited to, nonlinear optical materials, metamaterials and plasmonics, nano-photonic structures, stimulated scatterings, harmonic generations, wave mixing, real time holography, guided waves and solitons, bistabilities, instabilities and nonlinear dynamics, and their applications in laser and coherent lightwave amplification, guiding, switching, modulation, communication and information processing. Original papers, comprehensive reviews and rapid communications reporting original theories and observations are sought for in these and related areas. This journal will also publish proceedings of important international meetings and workshops. It is intended for graduate students, scientists and researchers in academic, industrial and government research institutions.