Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: TR: Nanoelectronics II: Spintronics and Magnetotransport

TT 6.13: Vortrag

Montag, 22. März 2010, 17:15–17:30, H19

Hyperfine mediated triplet-singlet transition probability in a double-quantum-dot system: Analogy with the double-slit experiment — •Fernando Dominguez, Carlos López-Monís, and Gloria Platero — Instituto de ciencia de los materiales de Madrid (ICMM)

Recent experiments and theoretical works have been devoted to the analysis of transport through double quantum dots in the spin blockade regime. There, the current is blocked unless spin scattering induces electron spin-flip, giving rise to electronic triplet-singlet transition. Hyperfine interaction is the main mechanism responsible for spin-flip and it will be considered in the present work. We present an elementary measurement theory scheme in order to analyze the electronic triplet-singlet transition mediated by the hyperfine interaction in a double quantum dot. We show that the local character of the hyperfine interaction and the nuclear back-action process (flip-flop) are crucial for canceling destructive interferences of the triplet-singlet transition probability. It is precisely this cancellation which distinguishes the transition probability mediated by hyperfine interaction from the effect due to an anisotropic magnetic field.

[1] Phys. Rev. B 80, 201301 R (2009)