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Träfflista för sökning "WFRF:(Sekine N) "

Search: WFRF:(Sekine N)

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  • 2017
  • swepub:Mat__t
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  • Schuette-Engel, Jan, et al. (author)
  • Axion quasiparticles for axion dark matter detection
  • 2021
  • In: Journal of Cosmology and Astroparticle Physics. - : IOP Publishing Ltd. - 1475-7516. ; :8
  • Journal article (peer-reviewed)abstract
    • It has been suggested that certain antiferromagnetic topological insulators contain axion quasiparticles (AQs), and that such materials could be used to detect axion dark matter (DM). The AQ is a longitudinal antiferromagnetic spin fluctuation coupled to the electromagnetic Chern-Simons term, which, in the presence of an applied magnetic field, leads to mass mixing between the AQ and the electric field. The electromagnetic boundary conditions and transmission and reflection coefficients are computed. A model for including losses into this system is presented, and the resulting linewidth is computed. It is shown how transmission spectroscopy can be used to measure the resonant frequencies and damping coefficients of the material, and demonstrate conclusively the existence of the AQ. The dispersion relation and boundary conditions permit resonant conversion of axion DM into THz photons in a material volume that is independent of the resonant frequency, which is tuneable via an applied magnetic field. A parameter study for axion DM detection is performed, computing boost amplitudes and bandwidths using realistic material properties including loss. The proposal could allow for detection of axion DM in the mass range between 1 and 10 meV using current and near future technology.
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8.
  • Sekine, N, et al. (author)
  • Bloch gain in AlGaAs/GaAs semiconductor superlattices
  • 2004
  • In: Proceedings of the Eleventh International Conference on Modulated Semiconductor Structures (Physica E: Low-dimensional Systems and Nanostructures). - : Elsevier BV. - 1386-9477. ; 21:2-4, s. 858-862
  • Conference paper (peer-reviewed)abstract
    • We have investigated terahertz (THz) emission due to dynamical electron transport in wide miniband GaAs/Al0.3Ga0.7As superlattices. By noting that the time-domain THz emission spectroscopy contains the information on the step response of the electron system to the bias electric field, the obtained THz spectra were compared with the high-frequency conductivities predicted for miniband transport. Excellent agreement between theory and experiment strongly supports that the THz gain due to Bloch oscillating electrons persists at least up to 1.7 THz. It was also found that Zener tunneling into the second miniband sets the high-frequency limit of the THz gain for the samples studied here. (C) 2003 Elsevier B.V. All rights reserved.
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