通过光学照明控制硅/硅 0.7Ge0.3 量子器件的阈值电压

IF 3.8 2区 物理与天体物理 Q2 PHYSICS, APPLIED Physical Review Applied Pub Date : 2024-09-18 DOI:10.1103/physrevapplied.22.034044
M.A. Wolfe, Brighton X. Coe, Justin S. Edwards, Tyler J. Kovach, Thomas McJunkin, Benjamin Harpt, D.E. Savage, M.G. Lagally, R. McDermott, Mark Friesen, Shimon Kolkowitz, M.A. Eriksson
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引用次数: 0

摘要

在低温条件下对量子点量子比特器件进行光学照明的研究虽然不多,但通常用于在意外冲击事件或电荷注入后恢复工作条件。在这里,我们利用近红外(780 纳米)激光二极管演示了无掺杂 Si/Si0.7Ge0.3 场效应晶体管的系统阈值电压偏移。我们发现,在施加的栅极电压下进行照明,可以设定一个特定、稳定和可重现的阈值电压,在很宽的栅极偏置范围内,阈值电压等于该栅极偏置。在此范围之外,阈值电压仍然可以调整,尽管由此产生的阈值电压不再等于照明时的外加栅极偏置。我们提出了一个简单直观的模型,为栅极偏置的可调谐性提供了一个机制。我们提出的模型还解释了为什么低温照明能在不希望发生的充电事件后成功重置量子点量子比特器件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Control of threshold voltages in Si/Si0.7Ge0.3 quantum devices via optical illumination
Optical illumination of quantum dot qubit devices at cryogenic temperatures, while not well studied, is often used to recover operating conditions after undesired shocking events or charge injection. Here, we demonstrate systematic threshold-voltage shifts in a dopant-free Si/Si0.7Ge0.3 field-effect transistor using a near-infrared (780-nm) laser diode. We find that illumination under an applied gate voltage can be used to set a specific, stable, and reproducible threshold voltage that, over a wide range in gate bias, is equal to that gate bias. Outside this range, the threshold voltage can still be tuned, although the resulting threshold voltage is no longer equal to the applied gate bias during illumination. We present a simple and intuitive model that provides a mechanism for the tunability in the gate bias. The model presented also explains why cryogenic illumination is successful at resetting quantum dot qubit devices after undesired charging events.
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来源期刊
Physical Review Applied
Physical Review Applied PHYSICS, APPLIED-
CiteScore
7.80
自引率
8.70%
发文量
760
审稿时长
2.5 months
期刊介绍: Physical Review Applied (PRApplied) publishes high-quality papers that bridge the gap between engineering and physics, and between current and future technologies. PRApplied welcomes papers from both the engineering and physics communities, in academia and industry. PRApplied focuses on topics including: Biophysics, bioelectronics, and biomedical engineering, Device physics, Electronics, Technology to harvest, store, and transmit energy, focusing on renewable energy technologies, Geophysics and space science, Industrial physics, Magnetism and spintronics, Metamaterials, Microfluidics, Nonlinear dynamics and pattern formation in natural or manufactured systems, Nanoscience and nanotechnology, Optics, optoelectronics, photonics, and photonic devices, Quantum information processing, both algorithms and hardware, Soft matter physics, including granular and complex fluids and active matter.
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