等谱电子纳米结构中的量子相位提取

Phase extraction in disordered isospectral shapes

The phase of the electronic wave function is not directly measurable but, quite remarkably, it becomes accessible in pairs of isospectral shapes, as recently proposed in the experiment of Christopher R. Moon {\it et al.}, Science {\bf 319}, 782 (2008). The method is based on a special property, called transplantation, which relates the eigenfunctions of the isospectral pairs, and allows to extract the phase distributions, if the amplitude distributions are known. We numerically simulate such a phase extraction procedure in the presence of disorder, which is introduced both as Anderson disorder…

Impact of nanostructure configuration on the photovoltaic performance of quantum dot arrays

In this work, a mesoscopic model based on the non-equilibrium Green's function formalism for a tight-binding-like effective Hamiltonian is used to investigate a selectively contacted quantum dot array designed for operation as a single junction quantum dot solar cell. By establishing a direct relation between nanostructure configuration and optoelectronic properties, the investigation reveals the influence of inter-dot and dot-contact coupling strengths on the rates of charge carrier photogeneration, radiative recombination, and extraction at contacts, and consequently on the ultimate performa…

Hot Carrier extraction with plasmonic broadband absorbers

Hot charge carrier extraction from metallic nanostructures is a very promising approach for applications in photo-catalysis, photovoltaics and photodetection. One limitation is that many metallic nanostructures support a single plasmon resonance thus restricting the light-to-charge-carrier activity to a spectral band. Here we demonstrate that a monolayer of plasmonic nanoparticles can be assembled on a multi-stack layered configuration to achieve broad-band, near-unit light absorption, which is spatially localised on the nanoparticle layer. We show that this enhanced light absorbance leads to …

Measuring the randomness of micro and nanostructure spatial distributions: Effects of Scanning Electron Microscope image processing and analysis

The quantitative characterization of the degree of randomness and aggregation of surface micro and nanostructures is critical to evaluate their effects on targeted functionalities. To this end, the methods of Point Pattern Analysis (PPA), largely used in ecology and medical imaging, seem to provide a powerful toolset. However, the application of these techniques requires the extraction of the point pattern of nanostructures from their microscope images. In this work, we address the issue of the impact that Scanning Electron Microscope (SEM) image processing may have on the fundamental metric o…

氙等离子体聚焦离子束铣削作为确定性制备工作在C波段的高亮度高纯度单光子源的方法

Xenon plasma-focused ion beam milling as a method to deterministically fabricate bright and high-purity single-photon sources operating at C-band

针对电子束光刻制备C波段量子点光子纳米结构缺乏三维控制的问题，本研究采用氙等离子体聚焦离子束技术实现三维塑形，制备出高纯度、高提取效率的单光子源，提取效率超越同波段电子束光刻的最高报道值。

使用贝叶斯方法进行量子点电荷态估计

Charge state estimation in quantum dots using a Bayesian approach

本文提出基于贝叶斯定理的序贯方法估计量子点电荷态，相比平均法和阈值判断，在噪声方差不同及电荷跃迁时错误率更低，适用于单电子检测和量子比特读出。