Cooperative ordering in lattices of interacting two-level dipoles (2015)
Journal Article
Bettles, R., Gardiner, S., & Adams, C. (2015). Cooperative ordering in lattices of interacting two-level dipoles. Physical Review A, 92(6), Article 063822. https://doi.org/10.1103/physreva.92.063822

We investigate the cooperative behavior of regular monolayers of driven two-level dipoles, using classical electrodynamics simulations. The dipolar response results from the interference of many cooperative eigenmodes, each frequency-shifted from the... Read More about Cooperative ordering in lattices of interacting two-level dipoles.

Observation of interference effects via four-photon excitation of highly excited Rydberg states in thermal cesium vapor (2015)
Journal Article
Kondo, J., Šibalić, N., Guttridge, A., Wade, C., De Melo, N., Adams, C., & Weatherill, K. (2015). Observation of interference effects via four-photon excitation of highly excited Rydberg states in thermal cesium vapor. Optics Letters, 40(23), 5570-5573. https://doi.org/10.1364/ol.40.005570

We report on the observation of electromagnetically induced transparency (EIT) and absorption (EIA) of highly excited Rydberg states in thermal Cs vapor using a four-step excitation scheme. The advantage of this four-step scheme is that the final tra... Read More about Observation of interference effects via four-photon excitation of highly excited Rydberg states in thermal cesium vapor.

State purified deceleration of SD radicals by a Stark decelerator (2015)
Journal Article
Nourbakhsh, O., Michan, J., Mittertreiner, T., Carty, D., Wrede, E., Djuricanin, P., & Momose, T. (2015). State purified deceleration of SD radicals by a Stark decelerator. Molecular Physics, 113(24), 4007-4018. https://doi.org/10.1080/00268976.2015.1109151

Deceleration of supersonic beams of SD radicals by a linear Stark decelerator was demonstrated for the first time. SD radicals produced by an electric discharge of supersonic beams mainly occupied the lowest two rotational states of and in the 2Π3/2... Read More about State purified deceleration of SD radicals by a Stark decelerator.

Spectroscopic detection of atom-surface interactions in an atomic-vapor layer with nanoscale thickness (2015)
Journal Article
Whittaker, K., Keaveney, J., Hughes, I., Sargsyan, A., Sarkisyan, D., & Adams, C. (2015). Spectroscopic detection of atom-surface interactions in an atomic-vapor layer with nanoscale thickness. Physical Review A, 92(5), Article 052706. https://doi.org/10.1103/physreva.92.052706

We measure the resonance line shape of atomic-vapor layers with nanoscale thickness confined between two sapphire windows. The measurement is performed by scanning a probe laser through resonance and collecting the scattered light. The line shape is... Read More about Spectroscopic detection of atom-surface interactions in an atomic-vapor layer with nanoscale thickness.

Intercombination effects in resonant energy transfer (2015)
Journal Article
Vaillant, C., Potvliege, R., & Jones, M. (2015). Intercombination effects in resonant energy transfer. Physical Review A, 92(4), Article 042705. https://doi.org/10.1103/physreva.92.042705

We investigate the effect of intercombination transitions in excitation hopping processes such as those found in Förster resonance energy transfer. Taking strontium Rydberg states as our model system, the breakdown of LS coupling leads to weakly allo... Read More about Intercombination effects in resonant energy transfer.

Optimization of atomic Faraday filters in the presence of homogeneous line broadening (2015)
Journal Article
Zentile, M. A., Mathew, R. S., Whiting, D. J., Keaveney, J., Adams, C. S., & Hughes, I. G. (2015). Optimization of atomic Faraday filters in the presence of homogeneous line broadening. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(18), Article 185001. https://doi.org/10.1088/0953-4075/48/18/185001

We show that homogeneous line broadening drastically affects the performance of atomic Faraday filters. We study the effects of cell length and find that the behaviour of 'line-centre' filters are quite different from 'wing-type' filters, where the e... Read More about Optimization of atomic Faraday filters in the presence of homogeneous line broadening.

Electromagnetically induced absorption in a nondegenerate three-level ladder system (2015)
Journal Article
Whiting, D., Bimbard, E., Keaveney, J., Zentile, M., Adams, C., & Hughes, I. (2015). Electromagnetically induced absorption in a nondegenerate three-level ladder system. Optics Letters, 40(18), 4289-4292. https://doi.org/10.1364/ol.40.004289

We investigate, theoretically and experimentally, the transmission of light through a thermal vapor of three-level ladder-type atoms, in the presence of two counterpropagating control fields. A simple theoretical model predicts the presence of electr... Read More about Electromagnetically induced absorption in a nondegenerate three-level ladder system.

Absolute absorption on the potassium D lines: theory and experiment (2015)
Journal Article
Hanley, R. K., Gregory, P. D., Hughes, I. G., & Cornish, S. L. (2015). Absolute absorption on the potassium D lines: theory and experiment. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(19), Article 195004. https://doi.org/10.1088/0953-4075/48/19/195004

We present a detailed study of the absolute Doppler-broadened absorption of a probe beam scanned across the potassium D lines in a thermal vapour. Spectra using a weak probe were measured on the 4S $\to $ 4P transition and compared to the theoretical... Read More about Absolute absorption on the potassium D lines: theory and experiment.

From short-time diffusive to long-time ballistic dynamics: The unusual center-of-mass motion of quantum bright solitons (2015)
Journal Article
Weiss, C., Gardiner, S., & Breuer, H. (2015). From short-time diffusive to long-time ballistic dynamics: The unusual center-of-mass motion of quantum bright solitons. Physical Review A, 91(6), Article 063616. https://doi.org/10.1103/physreva.91.063616

Brownian motion is ballistic on short time scales and diffusive on long time scales. Our theoretical investigations indicate that one can observe the exact opposite—an “anomalous diffusion process” where initially diffusive motion becomes ballistic o... Read More about From short-time diffusive to long-time ballistic dynamics: The unusual center-of-mass motion of quantum bright solitons.

Analysis beyond the Thomas-Fermi approximation of the density profiles of a miscible two-component Bose-Einstein condensate (2015)
Journal Article
Polo, J., Ahufinger, V., Mason, P., Sridhar, S., Billam, T., & Gardiner, S. (2015). Analysis beyond the Thomas-Fermi approximation of the density profiles of a miscible two-component Bose-Einstein condensate. Physical Review A, 91(5), Article 053626. https://doi.org/10.1103/physreva.91.053626

We investigate a harmonically trapped two-component Bose-Einstein condensate within the miscible regime, close to its boundaries, for different ratios of effective intra- and interspecies interactions. We derive analytically a universal equation for... Read More about Analysis beyond the Thomas-Fermi approximation of the density profiles of a miscible two-component Bose-Einstein condensate.

A simple, versatile laser system for the creation of ultracold ground state molecules (2015)
Journal Article
Gregory, P., Molony, P., Köppinger, M., Kumar, A., Ji, Z., Lu, B., …Cornish, S. (2015). A simple, versatile laser system for the creation of ultracold ground state molecules. New Journal of Physics, 17, Article 055006. https://doi.org/10.1088/1367-2630/17/5/055006

Paper Part of Focus on New Frontiers of Cold Molecules Research A narrow-linewidth, dual-wavelength laser system is vital for the creation of ultracold ground state molecules via stimulated Raman adiabatic passage (STIRAP) from a weakly bound Feshbac... Read More about A simple, versatile laser system for the creation of ultracold ground state molecules.

Atomic Faraday filter with equivalent noise bandwidth less than 1  GHz (2015)
Journal Article
Zentile, M., Whiting, D., Keaveney, J., Adams, C., & Hughes, I. (2015). Atomic Faraday filter with equivalent noise bandwidth less than 1  GHz. Optics Letters, 40(9), 2000-2003. https://doi.org/10.1364/ol.40.002000

We demonstrate an atomic bandpass optical filter with an equivalent noise bandwidth less than 1 GHz using the D1 line in a cesium vapor. We use the ElecSus computer program to find optimal experimental parameters and find that, for important quantiti... Read More about Atomic Faraday filter with equivalent noise bandwidth less than 1  GHz.

Sagnac interferometry using bright matter-wave solitons (2015)
Journal Article
Helm, J., Cornish, S., & Gardiner, S. (2015). Sagnac interferometry using bright matter-wave solitons. Physical Review Letters, 114(13), Article 134101. https://doi.org/10.1103/physrevlett.114.134101

We use an effective one-dimensional Gross-Pitaevskii equation to study bright matter-wave solitons held in a tightly confining toroidal trapping potential, in a rotating frame of reference, as they are split and recombined on narrow barrier potential... Read More about Sagnac interferometry using bright matter-wave solitons.

Hilbert transform: applications to atomic spectra (2015)
Journal Article
Whittaker, K., Keveaney, J., Hughes, I., & Adams, C. (2015). Hilbert transform: applications to atomic spectra. Physical Review A, 91(3), Article 032513. https://doi.org/10.1103/physreva.91.032513

In many areas of physics, the Kramers-Kronig relations are used to extract information about the real part of the optical response of a medium from its imaginary counterpart. In this paper we discuss an alternative but mathematically equivalent appro... Read More about Hilbert transform: applications to atomic spectra.

Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms (2015)
Journal Article
Barredo, D., Labuhn, H., Rayets, S., Lahaye, T., Browaeys, A., & Adams, C. (2015). Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms. Physical Review Letters, 114(11), Article 113002. https://doi.org/10.1103/physrevlett.114.113002

We study coherent excitation hopping in a spin chain realized using highly excited individually addressable Rydberg atoms. The dynamics are fully described in terms of an XY spin Hamiltonian with a long range resonant dipole-dipole coupling that scal... Read More about Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms.