Energy level alignment of confined hole states in InAs1−x−ySbxPy asymmetric double quantum dots for single-photon energy up- and downconversion

IF 3.6 2区 物理与天体物理 Q2 PHYSICS, APPLIED
Karen M. Gambaryan, Owen Ernst, Torsten Boeck, Oliver Marquardt
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引用次数: 0

Abstract

We present a combined experimental and theoretical study of uncapped In(As, Sb, P) graded composition laterally coupled asymmetric double quantum dots (DQDs), suited for application in nanodiodes or single-photon nano-optical up- and downconverters in the mid-infrared spectral range. We provide details on the growth process using liquid-phase epitaxy and characterization using atomic-force microscopy and scanning electron microscopy (SEM). We find that most DQDs exhibit asymmetry such that the two quantum dots (QDs) of each pair have different dimensions, giving rise to correspondingly different quantum confinement of hole states localized in each QD. Based on these data, we have performed systematic simulations using an eight-band k·p model to identify the relationship between QD dimensions and the energy difference between corresponding confined hole states in the two QDs. Finally, we have determined the strength of an applied electric field required to energetically align the hole ground states of two QDs of different dimensions in order to facilitate hole tunneling to the next QD for further recombination and single-photon emission with a different wavelength.
InAs1−x−ySbxPy非对称双量子点单光子能量上下转换中受限空穴态的能级对准
我们提出了一种结合实验和理论研究的无帽In(As, Sb, P)梯度成分横向耦合非对称双量子点(DQDs),适用于中红外光谱范围内的纳米二极管或单光子纳米光学上下转换器。我们提供了使用液相外延和使用原子力显微镜和扫描电子显微镜(SEM)表征生长过程的细节。我们发现大多数双量子点表现出不对称性,使得每对量子点的两个量子点(QDs)具有不同的维度,从而导致每个量子点中定位的空穴态的量子限制相应不同。基于这些数据,我们使用八波段k·p模型进行了系统模拟,以确定两个量子点中相应受限空穴态之间的能量差与量子点尺寸之间的关系。最后,我们确定了将两个不同维度的量子点的空穴基态高能排列所需的外加电场强度,以促进空穴隧穿到下一个量子点进行进一步的复合和不同波长的单光子发射。
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来源期刊
Applied Physics Letters
Applied Physics Letters 物理-物理:应用
CiteScore
6.40
自引率
10.00%
发文量
1821
审稿时长
1.6 months
期刊介绍: Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.
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