Magnetic-field-induced singularities in spin dependent tunneling through InAs quantum dots
نویسندگان
چکیده
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 fieldinduced 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. PACS numbers: 73.40.Gk, 73.23.Hk, 72.10.Fk 85.30.Vw Typeset using REVTEX
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