213 Works

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...

Radiation trapping in a dense cold Rydberg gas: Supporting data

Daniel P. Sadler, Elizabeth M. Bridge, Danielle Boddy, Alistair D. Bounds, Niamh C. Keegan, Graham Lochead, Matthew P. A. Jones & Beatriz Olmos
Data files can be opened in Matlab. The authors used Matlab R2015a. If you do not have access to Matlab, Mathematica, Scilab (freeware) or similar applications should be able to open the files.

Data for "Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven nonequilibrium phase transitions"

Nikola Šibalić
We investigate the nonequilibrium dynamics of a driven-dissipative spin ensemble with competing power-law interactions. We demonstrate that dynamical phase transitions as well as bistabilities can emerge for asymptotic van der Waals interactions, but critically rely on the presence of a slower decaying potential core. Upon introducing random particle motion, we show that a finite gas temperature can drive a phase transition with regards to the spin degree of freedom and eventually leads to mean-field behavior...

Topological properties of a dense atomic lattice gas [dataset]

Robert J. Bettles, Jiri Minar, Charles S. Adams, Igor Lesanovsky & Beatriz Olmos
We investigate the existence of topological phases in a dense two-dimensional atomic lattice gas. The coupling of the atoms to the radiation field gives rise to dissipation and a nontrivial coherent long-range exchange interaction whose form goes beyond a simple power law. The far-field terms of the potential—which are particularly relevant for atomic separations comparable to the atomic transition wavelength—can give rise to energy spectra with one-sided divergences in the Brillouin zone. The long-ranged character...

Local magnetism, magnetic order and spin freezing in the 'nonmetallic metal' FeCrAs [dataset]

T Lancaster, B M Huddart, M T Birch, F L Pratt, D G Porter, S J Clark, S R Julian, P D Hatton, S J Blundell & W Wu
We present the results of x-ray scattering and muon-spin relaxation (μ+SR) measurements on the iron-pnictide compound FeCrAs. Polarized non-resonant magnetic x-ray scattering results reveal the 120° periodicity expected from the suggested three-fold symmetric, noncollinear antiferromagnetic structure. μ+SR measurements indicate a magnetically ordered phase throughout the bulk of the material below TN = 105(5) K. There are signs of fluctuating magnetism in a narrow range of temperatures above TN involving low-energy excitations, while at temperatures well...

Difference-frequency combs in cold atom physics: Supporting data

Matthew P. A. Jones, Elizabeth M. Bridge, Alistair D. Bounds, Niamh C. Keegan, Simon L. Cornish, Charles S. Adams, Jack Leonard, Wilhelm Kaenders, Patrick Leisching, Armin Zach, Alexander Sell, Felix Rohde, Thomas Puppe, Nazanin Hoghooghi & Russell Kliese
Supports the work "Difference-frequency combs in cold atom physics". Contains data for the beat notes and spectrum (the measured ion counts at each Rydberg laser detuning) shown in Figure 7.

B-spline based boundary conditions in the material point method [figure data]

Yun Bing
The material point method is an increasingly popular method for tackling solid mechanics problems involving large deformations. However, there are issues associated with applying boundary conditions in the method and, to date, no general approach for imposing both Neumann and Dirichlet boundary conditions has been proposed. In this paper, a new B-spline based boundary method is developed as a complete methodology for boundary representation, boundary tracking and boundary condition imposition in the standard material point...

Supporting Data: Nanometre-scale optical property fluctuations in Cu2ZnSnS4 revealed by low temperature cathodoluminescence

Budhika Mendis
Band tailing is a major contributing factor to the large open circuit voltage (Voc) deficit that is currently limiting Cu2ZnSnS4 (CZTS) photovoltaic devices. It occurs in highly doped, highly compensated semiconductors and gives rise to a non-uniform electronic band structure. Here we report spatially resolved fluctuations in CZTS optical properties using low temperature cathodoluminescence (CL) in a scanning electron microscope (SEM). Principal component analysis reveals three CL peaks whose relative intensity vary across domains ~100...

Spin-orbit coupled interferometry with ring–trapped Bose–Einstein condensates: supporting data

John L. Helm, Thomas P. Billam, Ana Rakonjac, Simon L. Cornish & Simon A. Gardiner
We propose a method of atom-interferometry using a spinor Bose–Einstein (BEC) and the well-established experimental technique of time-varying magnetic fields as a coherent beam-splitter. Our protocol creates long-lived superpositional counterflow states, which are of fundamental interest and can be made sensitive to both the Sagnac effect and magnetic fields on the sub micro-Gauss scale. We split a ring-trapped condensate, initially in the m f = 0 hyperfine sub-level, into superpositions of both internal spin state...

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