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Non-saturating magnetoresistance in heavily disordered semiconductors
M. M. Parish, P. B. Littlewood
The resistance of a homogeneous semiconductor increases quadratically with magnetic field at low fields and, except in very special cases, saturates at fields much larger than the…
Angular distribution of photoluminescence as a probe of Bose Condensation of trapped excitons
Jonathan Keeling, L. S. Levitov, P. B. Littlewood
Recent experiments on two-dimensional exciton systems have shown the excitons collect in shallow in-plane traps. We find that Bose condensation in a trap results in a dramatic chan…
Polariton condensation and lasing in optical microcavities - the decoherence driven crossover
M. H. Szymanska, P. B. Littlewood, B. D. Simons
We explore the behaviour of a system which consists of a photon mode dipole coupled to a medium of two-level oscillators in a microcavity in the presence of decoherence. We conside…
The crossover between lasing and polariton condensation in optical microcavities
M. H. Szymanska, P. B. Littlewood
We study a model of a photon mode dipole-coupled to a medium of two-level oscillators in a microcavity in the presence of dephasing processes introduced by coupling to external bat…
Double Exchange Alone Does Not Explain the Resistivity of
A. J. Millis, P. B. Littlewood, B. I. Shraiman
The system with has traditionally been modelled with a ``double exchange'' Hamiltonian, in which it is assumed that the only rel…
Exciton condensate in semiconductor quantum well structures.
Xuejun Zhu, P. B. Littlewood, M. S. Hybertsen +1
We propose that the exciton condensate may form in a well-controlled way in appropriately arranged semiconductor quantum well structures. The mean-field theory of Keldysh and Kopae…