212 Works

Splitting and recombination of bright-solitary-matter waves [dataset]

Oliver J. Wales, Ana Rakonjac, Thomas P. Billam, John L. Helm, Simon A. Gardiner & Simon L. Cornish
Solitons are long-lived wavepackets that propagate without dispersion and exist in a wide range of one-dimensional (1D) nonlinear systems. A Bose-Einstein condensate trapped in a quasi-1D waveguide can support bright-solitary-matter waves (3D analogues of solitons) when interatomic interactions are sufficiently attractive that they cancel dispersion. Solitary-matter waves are excellent candidates for a new generation of highly sensitive interferometers, as their non-dispersive nature allows them to acquire phase shifts for longer times than conventional matter-waves interferometers....

Domain wall encoding of integer variables for quantum annealing and QAOA [dataset]

Nicholas Chancellor
All of the data from the paper, as well as an easy python module or creating domain wall encodings. Marked as software, even though it also does contain the datasets.

Smart Water Channelling Through Dual Wettability by Leaves of the Bamboo Phyllostachys Aurea

James Wigzell
Abstract from article: The young leaves of the bamboo plant, Phyllostachys aurea, exhibit a distinct dual wetting behaviour on their adaxial surface. Contact angle analysis, variable pressure (environmental) scanning electron microscopy, gas chromatography, time-of-flight secondary ion mass spectrometry, and X-ray photoelectron spectroscopy have shown that the epicuticular wax morphology/topography and the surface distribution of chemical species underpin this water-channelling behaviour. Envisaged bioinspired applications include fog and dew harvesting in water-scarce regions of the world.

Supporting data: "Magnetic phase diagram of La_{2-x}Sr_{x}CoO_{4} revised using muon-spin relaxation"

Tom Lancaster
Abstract form the article: We report the results of a muon-spin relaxation (μSR) investigation of La_{2-x}Sr_{x}CoO_{4}, an antiferromagnetic insulating series which has been shown to support charge ordered and magnetic stripe phases and an hourglass magnetic excitation spectrum. We present a revised magnetic phase diagram, which shows that the suppression of the magnetic ordering temperature is highly sensitive to small concentrations of holes. Distinct behavior within an intermediate x range (0.2≤x≲0.6) suggests that the putative...

Robust NMR water signal suppression for demanding analytical applications

Juan A. Aguilar & Simon J. Kenwright
We describe the design and application of robust, general-purpose water signal suppression pulse sequences well suited to chemometric work. Such pulse sequences need to deal well with pulse mis-calibrations, radiation damping, chemical exchange, and the presence of sample inhomogeneities, as well as with significant variations in sample characteristics such as pH, ionic strength, relaxation characteristics and molecular weight. Of course, such pulse sequences should produce un- distorted lineshapes and baselines and work well both under...

Supporting data: Four-wave mixing in the hyperfine Paschen-Back regime

Renju Mathew, Daniel J. Whiting, James Keaveney, Charles S Adams & Ifan G Hughes
We present an experimental study of seeded four-wave mixing (4WM) using a diamond excitation scheme (with states from the 5S1/2, 5P1/2, 5P3/2 and 5D1/2 terms) in a thermal vapour of 87Rb atoms. We investigate the 4WM spectra under the application of a strong magnetic field (0.6 T). The Zeeman interaction is strong enough to realise the hyperfine Paschen-Back regime, which has the effect of separating the optical transitions by more than the Doppler width, thereby...

Raw data used to create the figures in the article "Ultra-high dispersion NMR reveals new levels of detail"

Juan A. Aguilar, Peter Kiraly, Ralph Adams, Mickaëlle Bonneau, Elizabeth J. Gray, Mathias Nilsson, Alan M. Kenwright & Gareth A. Morris
Raw NMR files (FID's)

Computing small pivot-minors [software]

Konrad K. Dabrowski
A graph G contains a graph H as a pivot-minor if H can be obtained from G by applying a sequence of vertex deletions and edge pivots. Pivot-minors play an important role in the study of rank-width. However, so far, pivot-minors have only been studied from a structural perspective. In the associated paper, we initiate a systematic study into their complexity aspects. We first prove that the Pivot-Minor problem, which asks if a given graph...

Intercombination Effects in Dipole-Mediated Energy Transfer (Data Files)

Christophe Vaillant, Robert Potvliege & Matt Jones
Data files to accompany the article entitled "Intercombination Effects in Dipole-Mediated Energy Transfer". Data files include all data used in the generation of the figures shown in the article. For more information, please see the article in question, or refer to the README.txt file

Single-photon interference due to motion in an atomic collective excitation: Supporting data

Daniel J. Whiting, Nikola Sibalic, James Keaveney, Charles S. Adams & Ifan G. Hughes
Quantum-state engineering is of critical importance to the development of quantum technologies. One promising platform is thermal atomic vapours, because they offer long coherence times with reproducible and scalable hardware. However, the inability to address isolated atomic states in a controlled manner, due to multi-level degeneracy and motional broadening, is a major obstacle to their wider application. Here we show how the atomic motion can be exploited to prepare robust and tunable collective quantum states....

Production of ultracold Cs*Yb molecules by photoassociation [dataset]

Alex Guttridge
Data files used in the publication "Production of ultracold Cs*Yb molecules by photoassociation"

NURBS plasticity: non-associated plastic flow [figure data]

W.M. Coombs & Y. Ghaffari Motlagh
This paper extends the non-uniform rational basis spline (NURBS) plasticity frame- work of Coombs et al. [11] and Coombs and Ghaffari Motlagh [10] to include non-associated plastic flow. The NURBS plasticity approach allows any smooth isotropic yield envelope to be represented by a NURBS surface whilst the numerical algorithm (and code) remains unchanged. This paper provides the full theoretical and algorithmic basis of the non-associated NURBS plasticity approach and demonstrates the predictive capability of the...

Coupling Molecular Dynamics and Deep Learning to Mine Protein Conformational Space [data and software]

Matteo Degiacomi
This work features generative neural networks (autoencoders) trained on protein structures produced by molecular simulations. Autoencoders are used to obtain new, plausible conformations complementing and extending pre-existing ones, usable in a protein-protein docking scenario.

Data_for_the_paper_HD-2D_Routine_high-dispersion two-dimensional NMR

Juan A. Aguilar, Raquel Belda, Alan M. Kenwright & Adolfo Botana
The present manuscript showcases how compressive sensing and pure shift techniques can be combined to produce two-dimensional NMR spectra with a resolving power far higher than can be achieved by conventional means in just a fraction of the time. Compressive sampling can be used to extend the resolving power of multidimensional experiments, but the effective resolution is ultimately limited by the presence of multiplets. Pure shift techniques can remove the multiplet problem but they are...

Durham RCUK [Green] Open Access Data Year 2 (Aug2014-Jul2015)

Frederick W. F. Foulds
Data listing all articles and conference papers published by a Durham author acknowledging RCUK funding between August 2014 and July 2015, which met the RCUK Open Access policy requirements via the Green OA route.

Quantitative optical spectroscopy of 87Rb vapour in the Voigt geometry in DC magnetic fields up to 0.4T [dataset]

Francisco S Ponciano-Ojeda, James Keaveney, Stefan M Rieche, Mark J Raine, Damian P Hampshire & Ifan G Hughes
We present a detailed spectroscopic investigation of a thermal 87Rb atomic vapour in magnetic fields up to 0.4T in the Voigt geometry. We fit experimental spectra with our theoretical model ElecSus and find excellent quantitative agreement, with RMS errors of ~0.3%. We extract the magnetic field strength and the angle between the polarisation of the light and the magnetic field from the atomic signal and find excellent agreement to within ~1% with a commercial Hall...

Bioinspired Breathable Architecture Data Archive

Rowan M Von Spreckelsen & Matthew T Harris
Abstract from paper: Thuja plicata is a coniferous tree which displays remarkable water channelling properties. In this article, an easily fabricated mesh inspired by the hierarchical macro surface structure of Thuja plicata branchlets is described which emulates this efficient water collection behaviour. The key parameters are shown to be the pore size, pore angle, mesh rotation, tilt angle (branch droop) and layering (branch overlap). Envisaged societal applications include water harvesting and low cost breathable architecture...

Controlling fragment competition on pathways to addressable self-assembly [dataset]

Jim Madge, Mark A. Miller & David Bourne
Addressable self-assembly is the formation of a target structure from a set of unique molecular or colloidal building-blocks, each of which occupies a defined location in the target. The requirement that each type of building-block appears exactly once in each copy of the target introduces severe restrictions on the combinations of particles and on the pathways that lead to successful self-assembly. These restrictions can limit the efficiency of self-assembly and the final yield of the...

Approaches to novel B-N chemistry at the boundary of Frustrated Lewis Pairs and bifunctional catalysis

Sergey Arkhipenko
This project is devoted to boron chemistry in two ways. Firstly, the development of the boron – nitrogen “Frustrated” Lewis Pairs (FLPs) was investigated by combining the principles of this approach with known bifunctional catalytic methods. This also included design and synthetic efforts towards new bifunctional catalysts 108 and 157 on the basis of L-proline connected to Lewis acidic borane or borinic derivatives, which revealed multiple peculiarities of boron chemistry. Catalyst 176 was successfully utilised...

Simultaneous Two-Photon Resonant Optical Laser Locking (STROLLing) in the hyperfine Paschen--Back regime [dataset]

Renju Mathew
We demonstrate a technique to lock simultaneously two laser frequencies to each step of a two-photon transition in the presence of a magnetic field sufficiently large to gain access to the hyperfine Paschen-Back regime. A ladder configuration with the 5S1/2, 5P3/2 and 5D5/2 terms in a thermal vapour of 87Rb atoms is used. The two lasers remain locked for more than 24 hours. For the sum of the laser frequencies, which represents the stability of...

Ultracold Molecules for Quantum Simulation: Rotational Coherences in CaF and RbCs [dataset and software]

Jacob Blackmore & Luke Caldwell
Polar molecules offer a new platform for quantum simulation of systems with long-range interactions, based on the electrostatic interaction between their electric dipole moments. Here, we report the development of coherent quantum state control using microwave fields in 40Ca19F and 87Rb133Cs molecules, a crucial ingredient for many quantum simulation applications. We perform Ramsey interferometry measurements with fringe spacings of ~ 1 kHz and investigate the dephasing time of a superposition of N = 0 and...

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