Unintentional high density p-type modulation doping of a GaAs/AlAs core-multi-shell nanowire

Achieving significant doping in GaAs/AlAs core/shell nanowires (NWs) is of considerable technological importance but remains a challenge due to the amphoteric behavior of the dopant atoms. Here we show that placing a narrow GaAs quantum well in the AlAs shell effectively getters residual carbon acceptors leading to an \emph{unintentional} p-type doping. Magneto-optical studies of such a GaAs/AlAs core multi-shell NW reveal quantum confined emission. Theoretical calculations of NW electronic structure confirm quantum confinement of carriers at the core/shell interface due to the presence of ionized carbon acceptors in the 1~nm GaAs layer in the shell. Micro-photoluminescence in high magnetic field shows a clear signature of avoided crossings of the $n=0$ Landau level emission line with the $n=2$ Landau level TO phonon replica. The coupling is caused by the resonant hole-phonon interaction, which points to a large 2D hole density in the structure.Comment: just published in Nano Letters (http://pubs.acs.org/doi/full/10.1021/nl500818k

Avalanche amplification of a single exciton in a semiconductor nanowire

Interfacing single photons and electrons is a crucial ingredient for sharing quantum information between remote solid-state qubits. Semiconductor nanowires offer the unique possibility to combine optical quantum dots with avalanche photodiodes, thus enabling the conversion of an incoming single photon into a macroscopic current for efficient electrical detection. Currently, millions of excitation events are required to perform electrical read-out of an exciton qubit state. Here we demonstrate multiplication of carriers from only a single exciton generated in a quantum dot after tunneling into a nanowire avalanche photodiode. Due to the large amplification of both electrons and holes (> 10^4), we reduce by four orders of magnitude the number of excitation events required to electrically detect a single exciton generated in a quantum dot. This work represents a significant step towards single-shot electrical read-out and offers a new functionality for on-chip quantum information circuits

Higher Education and Labor Standards: Adapting to Overtime Regulations at the University of Mississippi

Recent attempts of amending the Section 13(1) overtime regulations proposed by the Wage and Hour Division in 2016 have placed a strain on universities’ budgets and services. As a result, departments on university campuses are home to challenges that affect both employers and employees. I provide a record of the history of Section 13(1) amendments to date in order to establish the context of my thesis. My thesis attempts to observe how various departments at the University of Mississippi have adapted to the new rule that the University has recently adopted. My review of the literature in combination with my survey results help me explore the main strategies departments use, which include the following: offering compensatory time instead of overtime pay, changing employee status to non-exempt, restricting overtime, and increasing pay. My survey results reveal respondents want overtime pay and more flexible hours to complete duties. I highlight the challenges universities and college students face due to the new rule. Finally, I propose some solutions to better overtime regulations, including increasing employer transparency of departmental overtime regulations, lowering the standard salary threshold, limiting comp time, and allowing for more flexible work hours

Постать Тараса Шевченка в рецепції Ліни Костенко

У статті розглядається поетика творення Ліною Костенко образу Кобзаря крізь призму власного "я", через пережиті відчуття поета-шістдесятника, що своєю проекцією нагадують душевні терзання великого поета.В статье рассмотрена поэтика создания Линой Костенко образа Тараса Шевченко сквозь призму собственного "я", через пережитые ощущения поэта-шестидесятника, своей проекцией напоминающие душевные терзания великого поэта.The article deals with the problem of the poetics creation by Lina Kostenko Taras Shevchenko’ image through a prism her own mind, through sensations of the poet-sixtier, by the projection reminding sincere torments the great poet is considered

The effect on melanoma risk of genes previously associated with telomere length.

Telomere length has been associated with risk of many cancers, but results are inconsistent. Seven single nucleotide polymorphisms (SNPs) previously associated with mean leukocyte telomere length were either genotyped or well-imputed in 11108 case patients and 13933 control patients from Europe, Israel, the United States and Australia, four of the seven SNPs reached a P value under .05 (two-sided). A genetic score that predicts telomere length, derived from these seven SNPs, is strongly associated (P = 8.92x10(-9), two-sided) with melanoma risk. This demonstrates that the previously observed association between longer telomere length and increased melanoma risk is not attributable to confounding via shared environmental effects (such as ultraviolet exposure) or reverse causality. We provide the first proof that multiple germline genetic determinants of telomere length influence cancer risk.This is the final version of the article. It first appeared from Oxford University Press via http://dx.doi.org/10.1093/jnci/dju26

Psychologie der Kreativität

Ein kleiner Streifzug durch die psychologische Kreativitätsforschung befasst sich mit den Möglichkeiten der Erfassung kreativer Prozesse, ihrer Manifestation, den Determinanten, der Frage nach der Notwendigkeit zu kreativem Denken und schließlich Erkenntnissen darüber, wie kreatives Denken gefördert werden kann

The state of pandemic preparedness in four European countries

One of the lessons learned from the COVID-19 pandemic is that monitoring determinants and behaviour can improve policy and communication strategies. To improve countries’ capacity to respond in a hot phase of a pandemic and build a resilient society, suitable monitoring in a cold phase of various behaviours and determinants that could become important in future pandemics is key. In March 2024 we launched the first round of the Pandemic Preparedness and Behaviour (PPb) survey in four European member states: Spain, Slovenia, Ireland and The Netherlands (N = ∼1000 per country). In this presentation we start by showing key findings. For example, we found that overall, approximately one third of participants believe their government is prepared if a new pandemic would occur next month. Next, we discuss similarities. For example, we find that in all four countries, perceived preparedness of self is higher than perceived preparedness of one’s government. We also address key differences, such as distinct patterns in perceived risk of a highly contagious outbreak in the next 5 years (whereas in Spain 26% perceives of participants an outbreak as probable, this is 43% in Slovenia) or differences in self-reported adherence to hygiene behaviours (i.e. handwashing after coughing or sneezing in elbow is markedly higher in the Slovenian sample than in the Netherlands). Next, we explore which determinants of these patterns are generalisable, and which are specific to two of the four countries: Spain and Slovenia. We follow up by comparing insights for policy and practice in their given contexts, as well as lessons learned with respect to use and development of the monitor. We conclude that monitoring individual behaviours and its determinants helps to develop joint efforts in developing effective public health policies across Europe regarding pandemic preparedness