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We have studied the influence of the InP spacer layer thickness on stacked InAs/InP quantum dots, using cross-sectional scanning tunnelling microscopy. We show that for a spacer layer thickness of up to 30 nm, the quantum dots are spatially correlated but for a separating distance of 50 nm the vertical ordering of the dots is lost. These values are the same as previously found for quantum dots in
Popular Abstract in Swedish Vad händer när en halvledarkristall blir väldigt liten? Ett halvledarmaterials optiska och elektriska egenskaper hänger ihop med hur partiklarna som bär elektrisk laddning, elektroner och hål, uppför sig. (En elektron är en negativt laddad partikel. Ett hål kan beskrivas som en positivt laddad bubbla i ett hav av elektroner, och precis som med bubblor är det ibland enklQuantum dots (QDs) are semiconductor nanocrystals with quantum confinement. This thesis uses various time-resolved spectroscopic techniques to study ultrafast charge carrier dynamics in colloidal CdSe quantum dots that are important both from a theoretical point of view and for their relevance for solar cell applications. Using 2D electronic spectroscopy, we follow charge carrier relaxation and tr
The temperature degradation in terahertz quantum cascade lasers is investigated with the focus on the role acoustic phonon scattering. A self-energy describing the electron-acoustic phonon interaction is derived and used to study the importance in transport and optical properties. We observe a strong degradation of the gain peak with temperature. Despite the very small coupling to electrons, the e
The strain distribution in InP quantum dots, coherently grown on a GaInP substrate, was determined by image analysis of high-resolution electron microscopy images. Image simulations were used to verify the obtained results. The measured strain values were compared with values obtained from finite element calculations, using the dot shape determined by electron microscopy. The measured and calculat
Scientific collaboration is an important part of conducting research. In this blog post, I would like to introduce my PhD topic as part of the Train2Wind ITN (Innovative Training Network) at the University of Copenhagen.
The Centre for East and South- East Asian Studies Work Report 2019 LUND UNIVERSITY | CENTRE FOR EAST AND SOUTH-EAST ASIAN STUDIES 2 CENTRE FOR EAST AND SOUTH-EAST ASIAN STUDIES WORK REPORT • 2019 Work Report 2019 for the Centre for East and South-East Asian Studies ADMINISTRATION AND ORGANISATION In January 2019 the Centre for East and Southeast Asian Studies moved to the Joint Faculties of Humani
https://www.ace.lu.se/sites/ace.lu.se/files/work_report_2019.pdf - 2026-07-18
We have investigated spin accumulation in Ni/Au/Ni single-electron transistors assembled by atomic force microscopy. The fabrication technique is unique in that unconventional hybrid devices can be realized with unprecedented control, including real-time tunable tunnel resistances. A grid of Au disks, 30 nm in diameter and 30 nm thick, is prepared on a SiO2 surface by conventional e-beam writing.
A density functional theory study is presented regarding the energetics and the Mulliken population analyses of a quantum mechanical/molecular mechanical (QM/MM) system including multiple iron-sulfur clusters in the QM region. The [FeFe]-hydrogenase from Desulfovibrio desulfuricans was studied, and both the active site (an Fe6S6 assembly generally referred to as the H-cluster) and an ancillary Fe4
Longitudinal field (LF = 110 G) muon spin relaxation (mu SR) has been used to investigate the pressure dependence (P < 4.5 kbar) of paramagnetic spin fluctuations in the spin glass alloy Y(Mn0.95Al0.05)(2) via observation of the mu(+) spin depolarization. External mechanical force is seen to counteract the Al-induced chemical pressure, fully delocalizing the Mn moment and altering the nature of th
In the competitive landscape of the modern business world, human capital stands as the cornerstone of organizational success. Retaining talented employees, particularly within Generation Z due to their high demands and aspirations, poses a great chal-lenge for organizations. This study investigates the impact of employer branding strategies on the employment intentions for retention of Generation
New excited states have been observed in the neutron deficient isotope Ag-98 following the Ni-58+Cr-50-->Te-108* heavy-ion reaction. One of these states may be interpreted as a maximum spin aligned state of the pi g(9/2)(-3) nu vg(7/2) configuration. Other possible interpretations within the nuclear shell model are discussed as well.
We consider exclusive double diffractive production of polarised axial-vector χ c(1 +) and tensor χ c(2 +) charmonia in proton-(anti)proton collisions at Tevatron energy. The corresponding amplitudes for these processes are derived within the k t-factorisation approach. Contribu
Counterion 23Na spin relaxation data are reported from the microemulsion phase in the AOT/water/isooctane system as a function of the water/AOT ratio, which determines the size of the aqueous droplets. The 23Na NMR measurements comprise three independent relaxation rates, allowing the individual spectral density values to be determined, as well as the second-order quadrupolar dynamic shift. The ef
Wireless communication systems like Wi-Fi and 5G rely on radio waves whose behavior is difficult to interpret in indoor environments without spatial context. Raw channel measurements processed by parameter estimation algorithms like Space-Alternating Generalized Expectation-Maximization (SAGE) extract multipath components described by their angle of arrival, propagation delay, and attenuation. How
The admission process to the PhD education at the Faculty of Medicine aims to ensure that all admitted PhD students are provided with the opportunities and resources necessary to complete a high-quality research education. Prior to admission, an assessment is therefore made related to the funding of the PhD student, the design of the research project, as well as the supervisors and the supervision
Our ultimate research vision is to discover, develop and implement novel neuroprotective and neurorestorative therapies for neurological disorders such as Parkinson’s disease, Huntingtons disease and stroke. My group works with translational research that is tightly linked to clinical research questions. Our experimental focus is to understand neurovascular disease mechanisms. We examine the dysfuOur ultimate research vision is to discover, develop and implement novel neuroprotective and neurorestorative therapies for neurological disorders such as Parkinson’s disease, Huntingtons disease and stroke. My group works with translational research that is tightly linked to clinical research questions. Our experimental focus is to understand neurovascular disease mechanisms. We examine the dysfu
