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通过凸形InAlAs渐变缓冲层优化在InP衬底上实现超高迁移率InAs量子阱

Realization of Very High Mobility InAs Quantum Wells on InP Substrates Through Convex InAlAs Graded Buffer Optimization

Tyler Lindemann, Rojila Ghimire, Alejandro Alcaraz Ramirez, Ahmad Azizimanesh, Sergei Gronin, Ray Kallaher, Michael J. Manfra

arXiv 2609.28795首次发表:更新:

发表机构

Purdue University; Microsoft Quantum(普渡大学; 微软量子)

机构由 AI 辅助整理,请以论文原文为准。

AI 中文总结

本文通过优化InAlAs变质缓冲层的凸形组分渐变,在InP衬底上实现了厚度大于10 nm的InAs量子阱,获得超过1.7×10^6 cm^2 V^{-1} s^{-1}的超高低温电子迁移率,为该材料系统迄今最高值。

AI 中文摘要

由于强自旋轨道耦合、大的朗德g因子以及高度透明的界面,InAs量子阱中的二维电子气(2DEG)为探索混合半导体-超导体异质结构中的拓扑超导性提供了理想平台。减少半导体中的无序仍然是区分微妙相互作用效应的主要挑战。在此,我们展示了在绝缘InP衬底上生长的超高迁移率InAs 2DEG。利用InAlAs变质缓冲层中的凸形组分渐变轮廓,我们展示了厚度大于10 nm的InAs量子阱,无需含Ga的包层。我们检查了这些异质结构的结构特性和电输运特性。变质InAlAs缓冲层设计的改进使得低温电子迁移率超过1.7×10^6 cm^2 V^{-1} s^{-1},在2DEG密度≤3.2×10^11 cm^{-2}时,这是该材料系统迄今报告的最高值。

英文摘要

Due to strong spin-orbit coupling, large Landé $g$-factor, and a highly transparent interface, the two-dimensional electron gas (2DEG) in InAs quantum wells provides an ideal platform for the exploration of topological superconductivity in hybrid semiconductor-superconductor heterostructures. Reduction of disorder in the semiconductor remains a primary challenge to the disambiguation of subtle interaction effects. Here we demonstrate very high mobility InAs 2DEGs grown on insulating InP substrates. Utilizing a convex compositional grading profile in an InAlAs metamorphic buffer we demonstrate InAs quantum wells with thickness greater than 10 nm without need of Ga-containing cladding layers. We examine structural and electrical transport properties of these heterostructures. Advances in the design of the metamorphic InAlAs buffer result in low-temperature electron mobility exceeding $1.7\times10^6$ cm$^2$ V$^{-1}$ s$^{-1}$ at 2DEG density $\leq3.2\times10^{11}$ cm$^{-2}$, the highest value yet reported for this material system.

论文原文

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