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Sökning: WFRF:(Wieck A D)

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1.
  • Hugger, S, et al. (författare)
  • Magnetic-barrier-induced conductance fluctuations in quantum wires
  • 2008
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 78:16, s. 165307-
  • Tidskriftsartikel (refereegranskat)abstract
    • Quasiballistic semiconductor quantum wires are exposed to localized perpendicular magnetic fields, also known as magnetic barriers. Pronounced, reproducible conductance fluctuations as a function of the magnetic barrier amplitude are observed. The fluctuations are strongly temperature dependent and remain visible up to temperatures of approximate to 10 K. Simulations based on recursive Greens functions suggest that the conductance fluctuations originate from parametric interferences of the electronic wave functions, which experience scattering between the magnetic barrier and the electrostatic potential landscape.
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2.
  • Tarasov, A, et al. (författare)
  • Quantized Magnetic Confinement in Quantum Wires
  • 2010
  • Ingår i: PHYSICAL REVIEW LETTERS. - : American Physical Society. - 0031-9007. ; 104:18, s. 186801-
  • Tidskriftsartikel (refereegranskat)abstract
    • Ballistic quantum wires are exposed to longitudinal profiles of perpendicular magnetic fields composed of a spike and a homogeneous part. An asymmetric magnetoconductance peak as a function of the homogeneous magnetic field is found, comprising quantized conductance steps in the interval where the homogeneous magnetic field and the magnetic barrier have identical polarities, and a characteristic shoulder with several resonances in the interval of opposite polarities. The observations are interpreted in terms of inhomogeneous diamagnetic shifts of the quantum wire modes leading to magnetic confinement.
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