Coherence properties and luminescence spectra of condensed polaritons in CdTe microcavities (2008)
Szymanska, M. H., Marchetti, F. M., Keeling, J., Littlewood, P. B.
We analyse the spatial and temporal coherence properties of a two-dimensional and finite sized polariton condensate with parameters tailored to the recent experiments which have shown spontaneous and...
Phase diagram for condensation of microcavity polaritons: from theory to practice (2008)
Marchetti, F. M., Szymanska, M. H., Keeling, J., Kasprzak, J., Andre, R., Littlewood, P. B., ...
The first realization of a polariton condensate was recently achieved in a CdTe microcavity [Kasprzak et al., Nature 443, 409 (2006)]. We compare the experimental phase boundaries, for various...
Coherent Particle Transfer in an On-Demand Single-Electron Source (2008)
Keeling, J., Shytov, A. V., Levitov, L. S.
Coherent electron transfer from a localized state trapped in a quantum dot into a ballistic conductor, taking place in on-demand electron sources, in general may result in excitation of particle-hole...
Collapse and revivals of a the photon field in a many-body Landau-Zener process (2008)
We consider the evolution of a two-level system coupled to a photon field initially in a coherent state, as the energy of the two-level system is linearly varied through resonance with the photon...
Hou, Baohong, Frakes, Lawrence Austin, Sandiford, Michael Andrew, Worrall, L., Keeling, J., Alley, Neville Foster
B. Hou, L.A. Frakes, M. Sandiford, L. Worrall, J. Keeling, N.F. Alley
Hou, Baohong, Frakes, Lawrence Austin, Sandiford, Michael Andrew, Worrall, L., Keeling, J., Alley, Neville Foster
B. Hou, L.A. Frakes, M. Sandiford, L. Worrall, J. Keeling, N.F. Alley
Collective coherence in planar semiconductor microcavities (2007)
Keeling, J., Marchetti, F. M., Szymanska, M. H., Littlewood, P. B.
Semiconductor microcavities, in which strong coupling of excitons to confined photon modes leads to the formation of exciton-polariton modes, have increasingly become a focus for the study of...
Szymanska, M. H., Keeling, J., Littlewood, P. B.
We study the mean-field theory, and the properties of fluctuations, in an out of equilibrium Bose-Fermi system, across the transition to a quantum condensed phase. The system is driven out of...
Minimal Excitation States of Electrons in One-Dimensional Wires (2006)
Keeling, J., Klich, I., Levitov, L. S.
A strategy is proposed to excite particles from a Fermi sea in a noise-free fashion by electromagnetic pulses with realistic parameters. We show that by using quantized pulses of simple form one can...
Marchetti, F. M., Keeling, J., Szymanska, M. H., Littlewood, P. B.
We investigate and compare different optical probes of a condensed state of microcavity polaritons in expected experimental conditions of non-resonant pumping. We show that the energy- and...
Minimal excitation states of electrons in one-dimensional wires (2006)
Keeling, J., Klich, I., Levitov, L. S.
A strategy is proposed to excite particles from a Fermi sea in a noise-free fashion by electromagnetic pulses with realistic parameters. We show that by using quantized pulses of simple form one can...
Non-equilibrium quantum condensation in an incoherently pumped dissipative system (2006)
Szymanska, M. H., Keeling, J., Littlewood, P. B.
We study spontaneous quantum coherence in an out of equilibrium system, coupled to multiple baths describing pumping and decay. For a range of parameters describing coupling to, and occupation of the...
Thermodynamics and Excitations of Condensed Polaritons in Disordered Microcavities (2005)
Marchetti, F. M., Keeling, J., Szymanska, M. H., Littlewood, P. B.
We study the thermodynamic condensation of microcavity polaritons using a realistic model of disorder in semiconductor quantum wells. This approach correctly describes the polariton inhomogeneous...
Science Curriculum Experiences with Research Investigations (2003)
Colvill, MH, Dalton, M, Towns, R, Paine, K, Nankerivis, K, Keeling, J, ...
Kapadia, A, Feizi, T, Jewell, D, Keeling, J, Slavin, G
Indirect immunofluorescence studies of blood group A, H, I, and i antigens were performed on the gastric mucosae and tumor tissues of patients with gastric carcinoma, on the mucosae of patients with...
Is there a link between cot death and child abuse?
Roberts, J, Golding, J, Keeling, J, Sutton, B, Lynch, M A
Forty five babies delivered in Oxford obstetric units who subsequently died unexpectedly in infancy were compared with 134 controls matched for maternal age, social class, parity, and year of birth...
Kapadia, A, Feizi, T, Jewell, D, Keeling, J, Slavin, G
Indirect immunofluorescence studies of blood group A, H, I, and i antigens were performed on the gastric mucosae and tumor tissues of patients with gastric carcinoma, on the mucosae of patients with...
Is there a link between cot death and child abuse?
Roberts, J, Golding, J, Keeling, J, Sutton, B, Lynch, M A
Forty five babies delivered in Oxford obstetric units who subsequently died unexpectedly in infancy were compared with 134 controls matched for maternal age, social class, parity, and year of birth...
Vennelle, M, Brander, P, Kingshott, R, Rees, K, Warren, P, Keeling, J, ...
Background: One postulated cause of the sudden infant death syndrome (SIDS) is upper airway obstruction during sleep. Several studies have suggested that SIDS may be more common in families with...
Timing of intraventricular haemorrhage.
Emerson, P, Fujimura, M, Howat, P, Howes, D, Keeling, J, Robinson, R O, ...
The detection of the onset of intraventricular haemorrhage (IVH) during life is a necessary preliminary to understanding the cause of this condition. In 10 infants of very low birthweight treated...
Aynsley-Green, A, Polak, J M, Bloom, S R, Gough, M H, Keeling, J, Ashcroft, S J, ...
Three newborn infants are reported who developed severe non-ketotic hypoglycaemia (blood glucose less than 1.1 mmol/l; 19.8 mg/100 ml) within 6 hours of birth. All had inappropriately raised plasma...
AIMS—To study the cardiac pathology of infants enrolled in the UK collaborative trial of neonatal ECMO (extra corporeal membrane oxygen) who died following random allocation to a trial...
Becher, J, Bell, J, Keeling, J, McIntosh, N, Wyatt, B
Background: A proportion of neonatal deaths from asphyxia have been shown to be associated with pre-existing brain injury.
Theilen, U, Lyon, A, Fitzgerald, T, Hendry, G, Keeling, J
Background: Despite having mild early respiratory disease, many preterm babies develop chronic lung disease (CLD). Intrauterine infection with Ureaplasma urealyticum has been associated with preterm...