Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-09-07
Physical Review Letters 87, 146601 (2001)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 4 figures, to be published in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.87.146601
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.
Chang Kee Joo
Ihm G.
Kim Nam
Sim Hyung-Seok
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