Bose-Einstein condensation of trapped polaritons in 2D electron-hole systems in a high magnetic field - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




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Abstract: The Bose-Einstein condensation BEC of magnetoexcitonic polaritons intwo-dimensional 2D electron-hole system embedded in a semiconductormicrocavity in a high magnetic field $B$ is predicted. There are two physicalrealizations of 2D electron-hole system under consideration: a graphene layerand quantum well QW. A 2D gas of magnetoexcitonic polaritons is considered ina planar harmonic potential trap. Two possible physical realizations of thistrapping potential are assumed: inhomogeneous local stress or harmonic electricfield potential applied to excitons and a parabolic shape of the semiconductorcavity causing the trapping of microcavity photons. The effective Hamiltonianof the ideal gas of cavity polaritons in a QW and graphene in a high magneticfield and the BEC temperature as functions of magnetic field are obtained. Itis shown that the effective polariton mass $M { m eff}$ increases withmagnetic field as $B^{1-2}$. The BEC critical temperature $T {c}^{0}$decreases as $B^{-1-4}$ and increases with the spring constant of the parabolictrap. The Rabi splitting related to the creation of a magnetoexciton in a highmagnetic field in graphene and QW is obtained. It is shown that Rabi splittingin graphene can be controlled by the external magnetic field since it isproportional to $B^{-1-4}$, while in a QW the Rabi splitting does not depend onthe magnetic field when it is strong.



Author: Oleg L. Berman, Roman Ya. Kezerashvili, Yurii E. Lozovik

Source: https://arxiv.org/







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