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"Ford, Michael"
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Lost horizon
Kobi's blood may be the key to curing the Waste, and that means he and his Waste-infected friends must travel to an abandoned lab in Old Seattle if they want to end the Waste and bring justice to those responsible.
Book
Single photon emitters in hexagonal boron nitride: A review of progress
This report summarizes progress made in understanding properties such as zero-phonon-line energies, emission and absorption polarizations, electron-phonon couplings, strain tuning and hyperfine coupling of single photon emitters in hexagonal boron nitride. The primary aims of this research are to discover the chemical nature of the emitting centres and to facilitate deployment in device applications. Critical analyses of the experimental literature and data interpretation, as well as theoretical approaches used to predict properties, are made. In particular, computational and theoretical limitations and challenges are discussed, with a range of suggestions made to overcome these limitations, striving to achieve realistic predictions concerning the nature of emitting centers. A symbiotic relationship is required in which calculations focus on properties that can easily be measured, whilst experiments deliver results in a form facilitating mass-produced calculations.
Paper
Quantum emission from hexagonal boron nitride monolayers
Single-photon emission at room temperature can be achieved with hexagonal boron nitride due to electron and hole confinement in vacancy-related defects.
Artificial atomic systems in solids are widely considered the leading physical system for a variety of quantum technologies, including quantum communications, computing and metrology
1
,
2
. To date, however, room-temperature quantum emitters have only been observed in wide-bandgap semiconductors such as diamond
3
and silicon carbide
4
, nanocrystal quantum dots
5
,
6
,
7
, and most recently in carbon nanotubes
8
. Single-photon emission from two-dimensional materials has been reported
9
,
10
,
11
,
12
, but only at cryogenic temperatures. Here, we demonstrate room-temperature, polarized and ultrabright single-photon emission from a colour centre in two-dimensional hexagonal boron nitride. Density functional theory calculations indicate that vacancy-related defects are a probable source of the emission. Our results demonstrate the unprecedented potential of van der Waals crystals for large-scale nanophotonics and quantum information processing.
Journal Article
من هو هنري فورد ؟
يتناول الكتاب موضوع عن\"هنري فورد\" أنه كان مهووسا منذ صغره بالأجهزة الميكانيكية، مثل الساعات والألعاب الميكانيكية، ولم يكن قد شاهد من قبل ما يؤهله مسبقا لاستيعاب ما رآه في أحد الطرق الترابية في ولاية ميتشيجان في عام 1876، فعندما كان عمره اثني عشر عاما، شاهد \"هنري\" عربة صغيرة تحمل محركا بخاريا تمر من أمامه بسرعة. كان الفلاحون قديما يستخدمون المحركات البخارية لتشغيل آلات الحراثة، وكانت الخيول تجر هذه العربات من مكان لآخر، ولكن صاحب ذلك \"المحرك الذي يسير في الطريق\" طور هذا الأمر، حيث ربط المحرك في عجلات العربة بسلسلة، وهكذا سارت في طريقها بقوة دفع ذاتية! وأصابت هنري الدهشة !.
Book
Tunable and high-purity room temperature single-photon emission from atomic defects in hexagonal boron nitride
Two-dimensional van der Waals materials have emerged as promising platforms for solid-state quantum information processing devices with unusual potential for heterogeneous assembly. Recently, bright and photostable single photon emitters were reported from atomic defects in layered hexagonal boron nitride (hBN), but controlling inhomogeneous spectral distribution and reducing multi-photon emission presented open challenges. Here, we demonstrate that strain control allows spectral tunability of hBN single photon emitters over 6 meV, and material processing sharply improves the single photon purity. We observe high single photon count rates exceeding 7 × 10
6
counts per second at saturation, after correcting for uncorrelated photon background. Furthermore, these emitters are stable to material transfer to other substrates. High-purity and photostable single photon emission at room temperature, together with spectral tunability and transferability, opens the door to scalable integration of high-quality quantum emitters in photonic quantum technologies.
Inhomogeneous spectral distribution and multi-photon emission are currently hindering the use of defects in layered hBN as reliable single photon emitters. Here, the authors demonstrate strain-controlled wavelength tuning and increased single photon purity through suitable material processing.
Journal Article
جون فورد : الفتى الذي صنع أفلام الغرب الأمريكي
الكتاب يسلط الضوء على حياة وأعمال المخرج الأمريكي الشهير جون فورد. الكتاب يتناول مسيرته المهنية الطويلة التي امتدت لأكثر من خمسين عاما، حيث أخرج خلالها أكثر من 140 فيلما، بما في ذلك العديد من أفلام الغرب الأمريكي التي أصبحت أيقونية. يستعرض الكتاب أيضا تأثير فورد الكبير على صناعة السينما، حيث كان رائدا في التصوير خارج الأستوديو واستخدام اللقطات الطويلة، مما أضفى على أفلامه طابعا فريدا. كما يتناول الكتاب الجوائز التي حصل عليها، بما في ذلك أربع جوائز أوسكار كأفضل مخرج.
Book
Identifying carbon as the source of visible single-photon emission from hexagonal boron nitride
Single-photon emitters (SPEs) in hexagonal boron nitride (hBN) have garnered increasing attention over the last few years due to their superior optical properties. However, despite the vast range of experimental results and theoretical calculations, the defect structure responsible for the observed emission has remained elusive. Here, by controlling the incorporation of impurities into hBN via various bottom-up synthesis methods and directly through ion implantation, we provide direct evidence that the visible SPEs are carbon related. Room-temperature optically detected magnetic resonance is demonstrated on ensembles of these defects. We perform ion-implantation experiments and confirm that only carbon implantation creates SPEs in the visible spectral range. Computational analysis of the simplest 12 carbon-containing defect species suggest the negatively charged
V
B
C
N
−
defect as a viable candidate and predict that out-of-plane deformations make the defect environmentally sensitive. Our results resolve a long-standing debate about the origin of single emitters at the visible range in hBN and will be key to the deterministic engineering of these defects for quantum photonic devices.
Comparison of hexagonal boron nitride samples grown with different techniques and with varying carbon-doping content provides evidence that the defects emitting single photons in the visible range are carbon related.
Journal Article
Julius Caesar
Julius Caesar is the most important man in Rome. But many Romans fear that his power is too great, and that he plans to make himself king. A plot is hatching against him. Will Brutus and Mark Antony join the conspiracy against their friend for the good of Rome?
Book
A multifunctional shape-morphing elastomer with liquid metal inclusions
Natural soft tissue achieves a rich variety of functionality through a hierarchy of molecular, microscale, and mesoscale structures and ordering. Inspired by such architectures, we introduce a soft, multifunctional composite capable of a unique combination of sensing, mechanically robust electronic connectivity, and active shape morphing. The material is composed of a compliant and deformable liquid crystal elastomer (LCE) matrix that can achieve macroscopic shape change through a liquid crystal phase transition. The matrix is dispersed with liquid metal (LM) microparticles that are used to tailor the thermal and electrical conductivity of the LCE without detrimentally altering its mechanical or shape-morphing properties. Demonstrations of this composite for sensing, actuation, circuitry, and soft robot locomotion suggest the potential for versatile, tissue-like multifunctionality.
Journal Article