Bipolar spin filter in a quantum dot molecule

Details Bipolar spin filter in a quantum dot molecule Bipolar spin filter in a quantum dot molecule

2006-02-17

arxiv.org/abs/cond-mat/0602403v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures (to appear in Appl. Phys. Lett.)

Scientific paper

10.1063/1.2175487

We show that the tunable hybridization between two lateral quantum dots connected to non-magnetic current leads in a `hanging-dot' configuration that can be used to implement a bipolar spin filter. The competition between Zeeman, exchange interaction, and interdot tunneling (molecular hybridization) yields a singlet-triplet transition of the double dot {\it ground state} that allows spin filtering in Coulomb blockade experiments. Its generic nature should make it broadly useful as a robust bidirectional spin polarizer.

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