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Abstract:
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Among the many examples of Bose condensation considered in physics , electron -hole -pair (exciton ) condensation has maintained special interest because it has been difficult to realize experimentally , and because of controversy about condensate properties . In this thesis , we studied the various aspects of spontaneous symmetry broken state of exciton in bilayer using mean field theory . We calculated the photoluminescence of excitonic condensation created by laser . We developed a one -dimensional toy model of excitonic supercurrent using mean field theory plus non -equilibrium Green’s function (NEGF ) which give qualitatively consistent results with experiments . We proposed graphene bilayer as a novel system for excitonic condensation to occur and estimate it to exist even at temperature as high as room temperature . |