Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-12-15
Phys. Rev. B 71, 235302 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
RevTeX, 13 pages with included postscript figures, high resolution version available at http://hartree.raunvis.hi.is/~vidar/Ra
Scientific paper
10.1103/PhysRevB.71.235302
We investigate the transport through a quantum ring, a dot and a barrier embedded in a nanowire in a homogeneous perpendicular magnetic field. To be able to treat scattering potentials of finite extent in magnetic field we use a mixed momentum-coordinate representation to obtain an integral equation for the multiband scattering matrix. For a large embedded quantum ring we are able to obtain Aharanov-Bohm type of oscillations with superimposed narrow resonances caused by interaction with quasi-bound states in the ring. We also employ scattering matrix approach to calculate the conductance through a semi-extended barrier or well in the wire. The numerical implementations we resort to in order to describe the cases of weak and intermediate magnetic field allow us to produce high resolution maps of the ``near field'' scattering wave functions, which are used to shed light on the underlying scattering processes.
Bardarson Jens Hjorleifur
Gudmundsson Vidar
Lin Yu-Yu
Manolescu Andrei
Moldoveanu Valeriu
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