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Magnetic-barrier-induced conductance fluctuations in quantum wires

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


Physical Review. B 78 (2008), No.16, Art. 165307, 7 pp.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Journal Article
Fraunhofer IAF ()

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 10 K. Simulations based on recursive Green's 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.