• Title, Summary, Keyword: Magnetoconductance

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Various Quantum Ring Structures: Similarity and diversity

  • Park, Dae-Han;Kim, Nammee
    • Applied Science and Convergence Technology
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    • v.25 no.2
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    • pp.36-41
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    • 2016
  • Similarity and diversity of various quantum ring structures are investigated by classifying energy dispersions of three different structures: an electrostatic quantum ring, a magnetic quantum ring, and a magnetic-electric quantum ring. The wave functions and the eigenenergies of a single electron in the quantum ring structures are calculated by solving the Schrdinger equation without any electron-electron interaction. Magnetoconductance is studied by calculating a two-terminal conductance while taking into account the backscattering via the resonance through the states of the quantum rings at the center of a quasi-one dimensional conductor. It is found that the energy spectra for the various quantum ring structures are sensitive to additional electrostatic potentials as well as to the effects of a nonuniform magnetic field. There are also characteristics of similarity and diversity in the energy dispersions and in the single-channel magnetoconductance.

Magnetoconductance of a Hybrid Quantum Ring: Effects of Antidot Potentials

  • Kim, Nammee;Park, Dae-Han;Kim, Heesang
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.335.1-335.1
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    • 2016
  • The electronic structures of a hybrid magnetic-electric quantum ring and two terminal conductance taking into account the resonant backscattering via both magnetic and electric edge channels are studied. The hybrid magnetic-electric quantum ring is formed by a magnetic quantum dot combined with an additional antidot electrostatic potential at the center of the dot. Electrons are both magnetically and electrically confined to the plane. The antidot potential repelling electrons from the center of the dot plays an important role in the energy spectra and magnetoconductance. The angular momentum transition in the ground state and the behavior of magnetoconductance due to a change of the antidot potential are shown in comparison with the conventional magnetic quantum dot.

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Literature Review on Recent Magnetocardiography and Impedance-Magnetocardiography Technologies

  • Kandori, A.;Miyashita, T.;Ogata, K.;Seki, Y.;Suzuki, D.;Tsukamoto, A.;Saito, K.;Yokosawa, K.;Tsukada, K.;Yamada, Satsuki;Watanabe, Shigeyuki;Horigome, Hitoshi;Yamaguchi, Iwao
    • Progress in Superconductivity
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    • v.8 no.1
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    • pp.1-7
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    • 2006
  • We have developed magnetocardiography(MCG) and impedance magnetocardiography(I-MCG) for detecting heart disease by using dc-SQUID technology. The MCG system, using low-Tc SQUID, is being applied commercially for diagnosing heart disease. Using the low-Tc MCG system, many clinical studies on detection of abnormality have been performed. Furthermore, we have developed a portable MCG system using high-Tc SQUID. For detecting changes in kinetic impedance in the heart, an I-MCG system has been demonstrated. The I-MCG system could detect the mechanical movement of the heart. In this report, we review current clinical applications of magnetocardiography and impedance magnetocardiography.

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