arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2602.14546cond-mat.mes-hall
收藏

量化Ge/Si核心/壳层纳米线中的应变及其对电荷输运的影响

Quantifying Strain and its Effect on Charge Transport in Ge/Si Core/Shell Nanowires

University of Basel(巴塞尔大学);Swiss Nanoscience Institute, University of Basel(瑞士纳米科学研究所,巴塞尔大学);Institut de Ciència de Materials de Barcelona, ICMAB–CSIC(巴塞罗那材料科学研究所,ICMAB-CSIC)
Aswathi K. Sivan, Nicolas Forrer, Aakash Shandilya, Yang Liu, Janica Böhler, Alexander Vogel, Arianna Nigro, Pierre Chevalier Kwon, Artemii Efimov, Ilya Golokol… 展开作者

Aswathi K. Sivan, Nicolas Forrer, Aakash Shandilya, Yang Liu, Janica Böhler, Alexander Vogel, Arianna Nigro, Pierre Chevalier Kwon, Artemii Efimov, Ilya Golokolenov, Gerard Gadea, Riccardo Rurali, Andreas Baumgartner, Dominik M. Zumbühl, Ilaria Zardo

AI总结:

本研究通过Ge/Si核心/壳层纳米线应变调控,实现了高迁移率空穴,为高保真自旋量子比特应用提供新思路。

摘要:

半导体纳米结构中的应变工程为优化电子和光学性质以实现先进量子技术提供了有前景的途径。本研究探讨了核心和壳层厚度与Ge/Si核心/壳层纳米线中应变分布之间的关系,旨在将其作为自旋量子比特的宿主。采用金催化化学气相沉积技术合成纳米线,实现了对核心和壳层尺寸的控制。高分辨率透射电子显微镜和元素映射确认了结构完整性,而几何相分析和拉曼光谱提供了定量的应变变化信息,这些变化由核心和壳层的尺寸驱动。此外,极化分辨的μ-拉曼测量使我们能够量化Ge核心中应变函数的纵向和横向声子模式分裂。通过空穴迁移率测量研究了应变依赖的电子性质。最后,我们观察到25,500 cm²V⁻¹s⁻¹的记录高空穴迁移率,凸显了这些核心/壳层纳米线结构在实现高保真自旋量子比特中的潜力。我们的发现突显了几何形状在应变调节中的关键作用,并为优化可扩展量子设备架构中的Ge/Si纳米线提供了有价值的指导。

英文摘要:

Strain engineering in semiconductor nanostructures offers a promising route to optimize electronic and optical properties for advanced quantum technologies. This study explores the relationship between core and shell thicknesses and strain distribution in Ge/Si core/shell nanowires, targeting their application as hosts for spin qubits. Nanowires were synthesized using an Au-catalyzed chemical vapor deposition technique, achieving control over core and shell dimensions. High-resolution transmission electron microscopy and elemental mapping confirmed structural integrity, while Geometric Phase Analysis and Raman spectroscopy provided quantitative insights into strain variations driven by core and shell dimensions. Furthermore, polarization resolved $μ$-Raman measurements allowed us to quantify the longitudinal and transverse phonon mode splitting as a function of strain in the Ge core. The strain dependent electronic properties were investigated by hole mobility measurements. Finally, we observe a record high hole mobility of 25,500 cm$^2$V$^{-1}$s$^{-1}$, underscoring the potential of these core/shell nanowire structures for the realization of high-fidelity spin qubits. Our findings highlight the critical role of geometry in strain tuning and provide valuable design guidelines for optimizing Ge/Si nanowires in scalable quantum device architectures.

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。

↑