The Experts below are selected from a list of 18900 Experts worldwide ranked by ideXlab platform

Neil F Johnson - One of the best experts on this subject based on the ideXlab platform.

  • localized magnetoplasmon modes arising from broken translational symmetry in semiconductor superlattices
    Journal of Physics: Condensed Matter, 2000
    Co-Authors: John H Reina, J C Granada, Neil F Johnson
    Abstract:

    The Electromagnetic propagator associated with the localized collective magnetoplasmon excitations in a semiconductor superlattice with broken translational symmetry is calculated analytically within linear response theory. We discuss the properties of these collective excitations in both radiative and non-radiative regimes of the Electromagnetic Spectra. We find that low-frequency retarded modes arise when the surface density of carriers d at the symmetry-breaking layer is lower than the density 0 at the remaining layers. Otherwise ( d > 0 ) a doublet of localized, high-frequency magnetoplasmon-like modes occurs. The corresponding dispersion law and power spectrum of these modes are shown.

  • localized magnetoplasmon modes arising from broken translational symmetry in semiconductor superlattices
    arXiv: Condensed Matter, 1999
    Co-Authors: John H Reina, J C Granada, Neil F Johnson
    Abstract:

    The Electromagnetic propagator associated with the localized collective magnetoplasmon excitations in a semiconductor superlattice with broken translational symmetry, is calculated analytically within linear response theory. We discuss the properties of these collective excitations in both radiative and non-radiative regimes of the Electromagnetic Spectra. We find that low frequency retarded modes arise when the surface density of carriers at the symmetry breaking layer is lower than the density at the remaining layers. Otherwise a doublet of localized, high-frequency magnetoplasmon-like modes occurs.

John H Reina - One of the best experts on this subject based on the ideXlab platform.

  • localized magnetoplasmon modes arising from broken translational symmetry in semiconductor superlattices
    Journal of Physics: Condensed Matter, 2000
    Co-Authors: John H Reina, J C Granada, Neil F Johnson
    Abstract:

    The Electromagnetic propagator associated with the localized collective magnetoplasmon excitations in a semiconductor superlattice with broken translational symmetry is calculated analytically within linear response theory. We discuss the properties of these collective excitations in both radiative and non-radiative regimes of the Electromagnetic Spectra. We find that low-frequency retarded modes arise when the surface density of carriers d at the symmetry-breaking layer is lower than the density 0 at the remaining layers. Otherwise ( d > 0 ) a doublet of localized, high-frequency magnetoplasmon-like modes occurs. The corresponding dispersion law and power spectrum of these modes are shown.

  • localized magnetoplasmon modes arising from broken translational symmetry in semiconductor superlattices
    arXiv: Condensed Matter, 1999
    Co-Authors: John H Reina, J C Granada, Neil F Johnson
    Abstract:

    The Electromagnetic propagator associated with the localized collective magnetoplasmon excitations in a semiconductor superlattice with broken translational symmetry, is calculated analytically within linear response theory. We discuss the properties of these collective excitations in both radiative and non-radiative regimes of the Electromagnetic Spectra. We find that low frequency retarded modes arise when the surface density of carriers at the symmetry breaking layer is lower than the density at the remaining layers. Otherwise a doublet of localized, high-frequency magnetoplasmon-like modes occurs.

Nampalliwar Sourabh - One of the best experts on this subject based on the ideXlab platform.

  • Testing the Keplerian disk hypothesis using X-ray reflection spectroscopy
    2020
    Co-Authors: Tripathi Ashutosh, Zhou Biao, Abdikamalov, Askar B., Ayzenberg Dimitry, Bambi Cosimo, Nampalliwar Sourabh
    Abstract:

    The Novikov-Thorne model is the standard framework for the description of geometrically thin and optically thick accretion disks around black holes and is widely used to study the Electromagnetic Spectra of accreting black holes. One of the assumptions of the model is that the particles of the gas move on nearly-geodesic circular orbits on the equatorial plane. In this work, we propose to test the Keplerian velocity of the particles in the accretion disk using X-ray reflection spectroscopy. We present a modified version of RELXILL in which we introduce a phenomenological parameter, $\alpha$, to quantify possible deviations from Keplerian motion. We use our model to fit a Suzaku observation of the black hole binary GRS 1915+105. We find that the estimate of $\alpha$ is correlated to that of the inclination angle of the disk, $i$, and that we could test the Keplerian disk hypothesis in the presence of a robust and independent measurement of $i$.Comment: 8 pages, 4 figure

  • Testing the Keplerian disk hypothesis using X-ray reflection spectroscopy
    'American Physical Society (APS)', 2020
    Co-Authors: Tripathi Ashutosh, Zhou Biao, Abdikamalov, Askar B., Ayzenberg Dimitry, Bambi Cosimo, Nampalliwar Sourabh
    Abstract:

    The Novikov-Thorne model is the standard framework for the description of geometrically thin and optically thick accretion disks around black holes and is widely used to study the Electromagnetic Spectra of accreting black holes. One of the assumptions of the model is that the particles of the gas move on nearly-geodesic circular orbits on the equatorial plane. In this work, we propose to test the Keplerian velocity of the particles in the accretion disk using X-ray reflection spectroscopy. We present a modified version of RELXILL in which we introduce a phenomenological parameter, $\alpha$, to quantify possible deviations from Keplerian motion. We use our model to fit a Suzaku observation of the black hole binary GRS 1915+105. We find that the estimate of $\alpha$ is correlated to that of the inclination angle of the disk, $i$, and that we could test the Keplerian disk hypothesis in the presence of a robust and independent measurement of $i$.Comment: 9 pages, 5 figures. v2: refereed versio

J C Granada - One of the best experts on this subject based on the ideXlab platform.

  • localized magnetoplasmon modes arising from broken translational symmetry in semiconductor superlattices
    Journal of Physics: Condensed Matter, 2000
    Co-Authors: John H Reina, J C Granada, Neil F Johnson
    Abstract:

    The Electromagnetic propagator associated with the localized collective magnetoplasmon excitations in a semiconductor superlattice with broken translational symmetry is calculated analytically within linear response theory. We discuss the properties of these collective excitations in both radiative and non-radiative regimes of the Electromagnetic Spectra. We find that low-frequency retarded modes arise when the surface density of carriers d at the symmetry-breaking layer is lower than the density 0 at the remaining layers. Otherwise ( d > 0 ) a doublet of localized, high-frequency magnetoplasmon-like modes occurs. The corresponding dispersion law and power spectrum of these modes are shown.

  • localized magnetoplasmon modes arising from broken translational symmetry in semiconductor superlattices
    arXiv: Condensed Matter, 1999
    Co-Authors: John H Reina, J C Granada, Neil F Johnson
    Abstract:

    The Electromagnetic propagator associated with the localized collective magnetoplasmon excitations in a semiconductor superlattice with broken translational symmetry, is calculated analytically within linear response theory. We discuss the properties of these collective excitations in both radiative and non-radiative regimes of the Electromagnetic Spectra. We find that low frequency retarded modes arise when the surface density of carriers at the symmetry breaking layer is lower than the density at the remaining layers. Otherwise a doublet of localized, high-frequency magnetoplasmon-like modes occurs.

Tripathi Ashutosh - One of the best experts on this subject based on the ideXlab platform.

  • Testing the Keplerian disk hypothesis using X-ray reflection spectroscopy
    2020
    Co-Authors: Tripathi Ashutosh, Zhou Biao, Abdikamalov, Askar B., Ayzenberg Dimitry, Bambi Cosimo, Nampalliwar Sourabh
    Abstract:

    The Novikov-Thorne model is the standard framework for the description of geometrically thin and optically thick accretion disks around black holes and is widely used to study the Electromagnetic Spectra of accreting black holes. One of the assumptions of the model is that the particles of the gas move on nearly-geodesic circular orbits on the equatorial plane. In this work, we propose to test the Keplerian velocity of the particles in the accretion disk using X-ray reflection spectroscopy. We present a modified version of RELXILL in which we introduce a phenomenological parameter, $\alpha$, to quantify possible deviations from Keplerian motion. We use our model to fit a Suzaku observation of the black hole binary GRS 1915+105. We find that the estimate of $\alpha$ is correlated to that of the inclination angle of the disk, $i$, and that we could test the Keplerian disk hypothesis in the presence of a robust and independent measurement of $i$.Comment: 8 pages, 4 figure

  • Testing the Keplerian disk hypothesis using X-ray reflection spectroscopy
    'American Physical Society (APS)', 2020
    Co-Authors: Tripathi Ashutosh, Zhou Biao, Abdikamalov, Askar B., Ayzenberg Dimitry, Bambi Cosimo, Nampalliwar Sourabh
    Abstract:

    The Novikov-Thorne model is the standard framework for the description of geometrically thin and optically thick accretion disks around black holes and is widely used to study the Electromagnetic Spectra of accreting black holes. One of the assumptions of the model is that the particles of the gas move on nearly-geodesic circular orbits on the equatorial plane. In this work, we propose to test the Keplerian velocity of the particles in the accretion disk using X-ray reflection spectroscopy. We present a modified version of RELXILL in which we introduce a phenomenological parameter, $\alpha$, to quantify possible deviations from Keplerian motion. We use our model to fit a Suzaku observation of the black hole binary GRS 1915+105. We find that the estimate of $\alpha$ is correlated to that of the inclination angle of the disk, $i$, and that we could test the Keplerian disk hypothesis in the presence of a robust and independent measurement of $i$.Comment: 9 pages, 5 figures. v2: refereed versio