Magnetic-field-induced singularities in spin dependent tunneling through InAs quantum dots

Details Magnetic-field-induced singularities in spin dependent tunneling through InAs quantum dots Magnetic-field-induced singularities in spin dependent tunneling through InAs quantum dots

2000-03-24

arxiv.org/abs/cond-mat/0003400v3

Phys. Rev. B 62 (19), 12621 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.62.12621

Current steps attributed to resonant tunneling through individual InAs quantum dots embedded in a GaAs-AlAs-GaAs tunneling device are investigated experimentally in magnetic fields up to 28 T. The steps evolve into strongly enhanced current peaks in high fields. This can be understood as a field-induced Fermi-edge singularity due to the Coulomb interaction between the tunneling electron on the quantum dot and the partly spin polarized Fermi sea in the Landau quantized three-dimensional emitter.

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