Magnetoconductance Oscillations in Topological Crystalline Insulator Nanowires.

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-10-07 DOI:10.1021/acs.nanolett.5c02643

Vince van de Sande,Mathijs G C Mientjes,Femke J Witmans,Tim Hulsen,Xin Guan,Max S M Hoskam,Joost Ridderbos,Marcel A Verheijen,Floris A Zwanenburg,Alexander Brinkman,Fabrizio Nichele,Erik P A M Bakkers

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Abstract

Pb1-xSnxTe is a topological crystalline insulator (TCI) hosting topological surface and hinge states protected by crystal mirror symmetries. The bulk carrier density can be reduced by tuning the Sn ratio x. Here, we perform low-temperature magnetotransport measurements on Pb1-xSnxTe nanowires with varying x values grown by molecular beam epitaxy. We observe signatures of Aharonov-Bohm (AB)-type oscillations for 0.32 ≤ x ≤ 0.51, which coexist with aperiodic universal conductance fluctuations (UCFs) and are consistent with phase-coherent transport on the nanowire surface. We separately analyze the temperature dependence of the AB-type oscillations and UCFs. The oscillations give a phase coherence length of lϕ = 1.4 ± 0.2 μm at 80 mK, consistent with the ballistic transport regime. The UCF provides a significantly smaller lϕ, consistent with a diffusive bulk transport channel, parallel to the ballistic surface. Our results indicate the presence of phase-coherent surface states on Pb1-xSnxTe nanowires with 0.32 ≤ x ≤ 0.51.

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拓扑晶体绝缘体纳米线的磁导振荡。

Pb1-xSnxTe是一种拓扑晶体绝缘子（TCI），具有拓扑表面和铰链状态，受到晶体镜像对称性的保护。通过调整Sn比x，可以降低体积载流子密度。在这里，我们对通过分子束外延生长的不同x值的Pb1-xSnxTe纳米线进行了低温磁输运测量。在0.32≤x≤0.51时，我们观察到Aharonov-Bohm （AB）型振荡特征，这种振荡与非周期通用电导波动（ucf）共存，并且与纳米线表面的相参输运相一致。我们分别分析了ab型振荡和ucf的温度依赖性。在80 mK时，振荡的相位相干长度为lφ = 1.4±0.2 μm，与弹道输运状态一致。UCF提供了一个明显更小的lφ，与扩散体传输通道一致，平行于弹道表面。结果表明，Pb1-xSnxTe纳米线上存在相参表面态，其分布范围为0.32≤x≤0.51。

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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.