標題: Transport through a quantum ring, dot, and barrier embedded in a nanowire in magnetic field
作者: Gudmundsson, V
Lin, YY
Tang, CS
Moldoveanu, V
Bardarson, JH
Manolescu, A
電子物理學系
Department of Electrophysics
公開日期: 1-六月-2005
摘要: 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 a 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 Aharonov-Bohm type of oscillations with superimposed narrow resonances caused by interaction with quasibound states in the ring. We also employ the scattering matrix approach to calculate the conductance through a semiextended 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.
URI: http://dx.doi.org/10.1103/PhysRevB.71.235302
http://hdl.handle.net/11536/13595
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.71.235302
期刊: PHYSICAL REVIEW B
Volume: 71
Issue: 23
結束頁: 
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