Magnetic quantum dot: A magnetic transmission barrier and resonator

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We study the ballistic edge-channel transport in quantum wires with a magnetic quantum dot, which is formed by two different magnetic fields B* and B-0 inside and outside the dot, respectively. We find that the electron states located near the dot and the scattering of edge channels by the dot strongly depend on whether B* is parallel or antiparallel to B-0. For parallel fields, two-terminal conductance as a function of channel energy is quantized except for resonances, while, for antiparallel fields, it is not quantized and all channels can be completely reflected in some energy ranges. All these features are attributed to the characteristic magnetic confinements caused by nonuniform fields.
Publisher
AMERICAN PHYSICAL SOC
Issue Date
2001-10
Language
English
Article Type
Article
Keywords

2-DIMENSIONAL ELECTRON-GAS; EDGE STATES; RESISTANCE; FIELD; MAGNETOTRANSPORT; CONDUCTANCE; TRANSPORT

Citation

PHYSICAL REVIEW LETTERS, v.87, no.14, pp.146601 - 146601

ISSN
0031-9007
URI
http://hdl.handle.net/10203/23489
Appears in Collection
PH-Journal Papers(저널논문)
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