掺杂铬的 Bi2Se3 单晶体的表面电子结构

IF 2.4 4区材料科学 Q2 CRYSTALLOGRAPHY

Crystals Pub Date : 2024-09-14 DOI:10.3390/cryst14090812

Turgut Yilmaz, Xiao Tong, Zhongwei Dai, Jerzy T. Sadowski, Genda Gu, Kenya Shimada, Sooyeon Hwang, Kim Kisslinger, Elio Vescovo, Boris Sinkovic

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引用次数: 0

摘要

在这里，我们通过使用角度分辨光发射光谱，证明了 Bi2-xCrxSe3 单晶体具有明确清晰的带状结构，具有较大的体带间隙和不扭曲的拓扑表面态。这些光谱特征与其薄膜形态不同，在薄膜形态中，有报道称存在较大的非磁性间隙和扭曲的带状结构。我们进一步提供了基于激光的高分辨率光发射数据，这些数据揭示了即使在原始样品中也存在狄拉克点间隙。随着 Cr 掺杂到 Bi2Se3 块体中，该间隙变得更加明显。这些观察结果表明，磁性杂质和光源可以改变狄拉克点。

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Surface Electronic Structure of Cr Doped Bi2Se3 Single Crystals

Here, by using angle-resolved photoemission spectroscopy, we showed that Bi2−xCrxSe3 single crystals have a distinctly well-defined band structure with a large bulk band gap and undistorted topological surface states. These spectral features are unlike their thin film forms in which a large nonmagnetic gap with a distorted band structure was reported. We further provide laser-based high resolution photoemission data which reveal a Dirac point gap even in the pristine sample. The gap becomes more pronounced with Cr doping into the bulk of Bi2Se3. These observations show that the Dirac point can be modified by the magnetic impurities as well as the light source.

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来源期刊

Crystals CRYSTALLOGRAPHYMATERIALS SCIENCE, MULTIDIS-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

4.20

自引率

11.10%

发文量

1527

审稿时长

16.12 days

期刊介绍： Crystals (ISSN 2073-4352) is an open access journal that covers all aspects of crystalline material research. Crystals can act as a reference, and as a publication resource, to the community. It publishes reviews, regular research articles, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on article length. Full experimental details must be provided to enable the results to be reproduced. Crystals provides a forum for the advancement of our understanding of the nucleation, growth, processing, and characterization of crystalline materials. Their mechanical, chemical, electronic, magnetic, and optical properties, and their diverse applications, are all considered to be of importance.