Cotunneling through two-level quantum dots weakly coupled to ferromagnetic leads

Details Cotunneling through two-level quantum dots weakly coupled to ferromagnetic leads Cotunneling through two-level quantum dots weakly coupled to ferromagnetic leads

2006-10-27

arxiv.org/abs/cond-mat/0610768v1

Europhys. Lett. 76, 1200 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in EPL

Scientific paper

The spin-polarized transport through two-level quantum dots weakly coupled to ferromagnetic leads is considered theoretically in the Coulomb blockade regime. It is assumed that the dot is doubly occupied, so that the current flows due to cotunneling through singlet and triplet states of the dot. It is shown that transport characteristics strongly depend on the ground state of quantum dot. If the ground state is a singlet, differential conductance ($G$) displays a broad minimum at low bias voltage, while tunnel magnetoresistance (TMR) is given by the Julliere value. If triplet is the ground state of the system, there is a maximum in differential conductance at zero bias when the leads are magnetized in antiparallel. The maximum is accompanied by a minimum in TMR. The different behavior of $G$ and TMR may thus help to determine the ground state of the dot and the energy difference between the singlet and triplet states.

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