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Light-matter interactions : artificial and solid-state crystals embedded in an optical cavity

Abstract : This thesis is devoted to the characterization of crystalline structures for quantum technological applications. It is composed of two parts.In a first project we study the localization transition of one particle in an one-dimensional artificial quasiperiodic crystal, whose potential depends on the particle position. We consider an ultracold atom in an optical lattice, embedded in an optical cavity. The atom strongly couples to the cavity, leading to a second optical potential. The position of the atom within the cavity affects the cavity field, thus the atomic motion backacts on the potential it is subjected to. For incommensurate wavelengths, we show that the competition between the two potentials yields a quasiperiodic potential. We determine the parameters for which we reproduce the Aubry-Andr'e model and discuss the effects of the backaction on the localization transition.In the second project we propose a frequency down-conversion scheme to generate THz radiation using the exciton-phonon coupling in a semiconductor crystal. Our idea is based on a chain of interactions that are naturally present in a pumped semiconductor microcavity. We derive the crucial exciton-phonon coupling, starting from the electron-phonon interaction via the deformation potential and taking into account the crystal symmetry properties. We identify conditions necessary for THz emission, estimate the emission power and show that the exciton-phonon interaction provides a second-order susceptibility.
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Submitted on : Friday, February 9, 2018 - 3:53:06 PM
Last modification on : Friday, November 20, 2020 - 9:54:04 AM


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Katharina Rojan. Light-matter interactions : artificial and solid-state crystals embedded in an optical cavity. Quantum Physics [quant-ph]. Universität des Saarlandes, 2017. English. ⟨NNT : 2017GREAY039⟩. ⟨tel-01705621⟩



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