溅射SnTe薄膜中拓扑保护二维表面载流子的消相机制。

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-07-25 DOI:10.1021/acs.nanolett.5c01902

Negin Beryani Nezafat, Ahana Bhattacharya, Sepideh Izadi, Inga Ennen, Martin Wortmann, Lauritz Schnatmann, Shahram Solaymani, Sławomir Kulesza, Miroslaw Bramowicz, Michael Westphal, Jan Biedinger, Karsten Rott, Michael Dittler, Andreas Hütten, Günter Reiss, Martin Mittendorff and Gabi Schierning*,

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引用次数: 0

摘要

碲化锡（SnTe）是一种拓扑晶体绝缘体，具有具有拓扑保护的二维（2D）表面电荷载流子和三维体电荷载流子。由于二维载流子的数量相对较少，其优异的电子性能在实验中经常被掩盖。我们通过在室温下沉积纳米晶溅射SnTe薄膜来解决这个问题，这增加了2D载流子的比例。在这里，我们关联结构和电子参数，并研究这些二维电子的消相机制。失相机制从最薄薄膜中的准一维电子-电子相互作用到二维电子-电子相互作用，最后到较厚薄膜中的电子-声子相互作用。利用太赫兹时域光谱，我们测量了二维载流子的散射率，发现与Hikami-Larkin-Nagaoka （HLN）模型非常吻合。

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Dephasing Mechanisms of Topologically Protected 2D Surface Carriers in Sputtered SnTe Thin Films

Tin telluride (SnTe), a topological crystalline insulator, features two-dimensional (2D) surface charge carriers with topological protection and 3D bulk charge carriers. The outstanding electronic properties of the 2D carriers are often obscured in experiments due to their relatively low number. We address this by using nanocrystalline sputtered SnTe thin films deposited at room temperature, which increase the proportion of 2D carriers. Here, we correlate the structural and electronic parameters and investigate the dephasing mechanisms of these 2D electrons. The dephasing mechanisms vary from quasi-1D electron–electron interactions in the thinnest film studied to 2D electron–electron interactions and finally to electron–phonon interactions in thicker films. Using THz time domain spectroscopy, we measured the scattering rates of the 2D charge carriers and found excellent agreement with the Hikami-Larkin-Nagaoka (HLN) model.

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.