Browsing by Author "EASTHAM, PAUL"
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Adiabatic state preparation of interacting twolevel systems
EASTHAM, PAUL (2012) 
Amplitudemode dynamics of polariton condensates
EASTHAM, PAUL (2011)We study the stability of collective amplitude excitations in nonequilibrium polariton condensates. These excitations correspond to renormalized upper polaritons and to the collective amplitude modes of atomic gases and ... 
BCSBEC crossover in a system of microcavity polaritons
EASTHAM, PAUL (American Physical Society, 2005)We investigate the thermodynamics and signatures of a polariton condensate over a range of densities, using a model of microcavity polaritons with internal structure. We determine a phase diagram for this system including ... 
Bose condensation in a model microcavity
EASTHAM, PAUL (2000)We study the equilibrium properties of a system of dipoleactive excitons coupled to a single photon mode at fixed total excitation. Treating the presence or absence of a trapped exciton as a twolevel system produces a ... 
Bose condensation of cavity polaritons beyond the linear regime: The thermal equilibrium of a model microcavity
EASTHAM, PAUL (2001)We consider a generalization of the Dicke model. This model describes localized, physically separated, saturable excitations, such as excitons bound on impurities, coupled to a single longlived mode of an optical cavity. ... 
Breakdown of counterflow superfluidity in a disordered quantum Hall bilayer
EASTHAM, PAUL (2011)We present a theory for the regime of coherent interlayer tunneling in a disordered quantum Hall bilayer at total filling factor one, allowing for the effect of static vortices. We find that the system consists of domains ... 
Coherence properties of exciton polariton OPO condensates in one and two dimensions
EASTHAM, PAUL (2012) 
Coherence properties of the microcavity polariton condensate
EASTHAM, PAUL (2009)A theoretical model is presented which explains the dominant decoherence process in a microcavity polariton condensate. The mechanism which is invoked is the effect of selfphase modulation, whereby interactions transform ... 
Coherence protection in coupled quantum systems
EASTHAM, PAUL (2018) 
Condensation and lasing of microcavity polaritons: comparison between two models
EASTHAM, PAUL (Elsevier, 2005)Condensation of microcavity polaritons and the substantial influence of pairbreaking disorder and decoherence leading to a laser regime has been recently considered using two different models: a model for direct two ... 
Conical diffraction and the dispersion surface of hyperbolic metamaterials
BALLANTINE, KYLE; EASTHAM, PAUL; DONEGAN, JOHN (2014)Hyperbolic metamaterials are materials in which at least one principal dielectric constant is negative. We describe the refractive index surface, and the resulting refraction effects, for a biaxial hyperbolic metamaterial, with ... 
Conical diffraction of a Gaussian beam with a two crystal cascade
LUNNEY, JAMES; DONEGAN, JOHN; BALLANTINE, KYLE; EASTHAM, PAUL; PHELAN, CIARAN (2012) 
The creation and annihilation of optical vortices using cascade conical diffraction
LUNNEY, JAMES; DONEGAN, JOHN; PHELAN, CIARAN; RAKOVICH, YURY; EASTHAM, PAUL (2011)Internal conical diffraction produces a superposition of orthogonally polarised zero and firstorder Bessel like beams from an incident circularly polarised Gaussian beam. For rightcircularly polarised light, the firstorder ... 
Creation of entangled states in coupled quantum dots via adiabatic rapid passage
EASTHAM, PAUL (2012) 
Critical supercurrents and self organization in quantum Hall bilayers
EASTHAM, PAUL (2010)We present a theory of interlayer tunneling in a disordered quantum Hall bilayer at total filling factor one, allowing for the effect of static vortices. In agreement with recent experiments [Phys. Rev. B 80, 165120 ... 
Diamagnetism and flux creep in bilayer exciton superfluids
EASTHAM, PAUL (2012) 
Finitemomentum condensation in a pumped microcavity
EASTHAM, PAUL (2010)We calculate the absorption spectra of a semiconductor microcavity into which a nonequilibrium exciton population has been pumped. We predict strong peaks in the spectrum corresponding to collective modes analogous to the ... 
Finitesize fluctuations and photon statistics near the polariton condensation transition in a singlemode microcavity
EASTHAM, PAUL (2006)We consider polariton condensation in a generalized Dicke model, describing a singlemode cavity containing quantum dots, and extend our previous meanfield theory to allow for finitesize fluctuations. Within ... 
Generation of continuously tuneable fractional optical orbital angular momentum using internal conical diffraction
LUNNEY, JAMES; RAKOVICH, YURY; EASTHAM, PAUL; DONEGAN, JOHN (2010)Abstract: When a leftcircularly polarised Gaussian light beam, which has spin angular momentum (SAM) Jsp = ?? = 1? per photon, is incident along one of the optic axes of a slab of biaxial crystal it undergoes internal ...