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Electron-phonon coupling in graphene is studied across the Brillouin zone. The contributions from modulated hopping and conventional deformation potential coupling, and from intraband and interband coupling are analyzed and related to available experimental M-point spectroscopy.
The optical spin Hall effect results in a spatial texture in the pseudo-spin of exciton polaritons in semiconductor microcavities. Using circular pump polarization, we demonstrate theoretically and experimentally that this pattern can be optically controlled.
We discuss an extension of the random-phase approximation (RPA) which permits use of the strong two-body forces present in nuclear matter, finite nuclei and liquid 3He. A method is outlined for solving the RPA equations at finite momentum transfer for infinite Fermi systems when renormalized single-particle energies and exchange matrix elements of the interaction are included explicitly. Results are...
High frequency differential transmission spectroscopy of graphene, probing near the M-point, is performed and analyzed theoretically. Electron-phonon coupling is identified as the chief mechanism for renormalization with an effective acoustic deformation potential of approximately 5eV.
A generalization of Turing patterns, originally developed for chemical reactions, to patterns in quantum fluids can be realized with microcavity polaritons. Theoretical concepts of formation and control, together with experimental observations, will be presented.
We report on the formation of hexagonal polariton patterns in double semiconductor microcavities operating in the OPO regime. We experimentally and theoretically demonstrate both the formation and the optical control of these patterns.
We analyze the selection/switching of instability-induced optical patterns in semiconductor microcavities. Besides realistic calculations, we use a population model and Catastrophe theory to organize our understanding of the patterns' dynamics.
Spin- and polarization-dependent ultrafast blue shifts, transient gain and self-wave-mixing are observed in Bragg-spaced InGaAs/GaAs quantum wells. The data are in agreement with a microscopic theory.
Using a microscopic theory, we predict all-optical switching in planar semiconductor micro-cavities where a weak beam switches a stronger signal. The scheme is similar to that recently demonstrated in atomic vapors [Dawes et al., Science 308, 672 (2005)].
We propose a new mechanism for optical limiting in which nonlinear absorption and nonlinear reflection act in concert. The mechanism is based on the light-induced shift of the band gap in Bragg-spaced semiconductor quantum wells.
We propose a new mechanism for optical limiting in which nonlinear absorption and nonlinear reflection act in concert. The mechanism is based on the light-induced shift of the band gap in Bragg-spaced semiconductor quantum wells.
We present a comprehensive theory of optically probing electron spin precession in low-density quantum well exciton populations. We trace the microscopic origins of features observed in differential transmission and Faraday rotation measurements to exciton interactions.
We predict that in a typical pump-probe setup four-wave mixing instabilities associated with biexcitonic correlations in a single semiconductor quantum well can yield large optical gain in the probe and background-free four-wave mixing directions.
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