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Nonlinear bifurcation diagrams of the current states of microcavity exciton-polaritons in the lattice
摘要： We study nonequilibrium properties of exciton-polaritons in an incoherently driven semiconductor microcavity with an embedded weak-contrast periodic lattice. Within the framework of mean-field theory, we describe nonlinear eigenstates of coherent exciton polaritons having the structure of Bloch waves and identify nonlinear current states at the boundaries of Brillouin zone. We demonstrate a profound modification of the eigenfrequency-momenta bifurcation diagrams of the condensate evoked by exciton-exciton interactions. The discussed phenomenon occurs for the states possessing high degree of symmetry, i.e. in particular, for the states lying at the centre or at the boundary of Brillouin zone.
关键词： exciton-polaritons,semiconductor microcavity,Bloch waves,nonlinear bifurcation,Brillouin zone
更新于2025-09-23 15:21:21
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[IEEE 2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - Austin, TX, USA (2018.9.24-2018.9.26)] 2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - Efficient Modeling of Electron Transport with Plane Waves
摘要： We present a method to simulate ballistic quantum transport in one-dimensional nanostructures, such as extremely scaled transistors, with a channel of nanowires or nanoribbons. In contrast to most popular approaches, we develop our method employing an accurate plane-wave basis at the atomic scale while retaining the numerical ef?ciency of a localized (tight-binding) basis at larger scales. At the core of our method is a ?nite-element expansion, where the ?nite element basis is enriched by a set of Bloch waves at high-symmetry points in the Brillouin zone of the crystal. We demonstrate the accuracy and ef?ciency of our method with the self-consistent simulation of ballistic transport in graphene nanoribbon FETs.
关键词： graphene nanoribbon FETs,Bloch waves,finite-element expansion,plane-wave basis,ballistic quantum transport
更新于2025-09-04 15:30:14