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Quantized magnetic confinement in quantum wires

: Tarasov, A.; Hugger, S.; Xu, H.; Cerchez, M.; Heinzel, T.; Zozoulenko, I.V.; Gasser-Szerer, U.; Reuter, D.; Wieck, A.D.


Physical review letters 104 (2010), No.18, Art. 186801, 4 pp.
ISSN: 0031-9007
ISSN: 1079-7114
Journal Article
Fraunhofer IAF ()

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.