Pauli spin blockade in weakly coupled double quantum dots
- 18 May 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 73 (20), 205333
- https://doi.org/10.1103/physrevb.73.205333
Abstract
In a two-level system, constituted by two serially coupled single level quantum dots, coupled to external leads we find that the current is suppressed in one direction of biasing caused by a fully occupied two-electron triplet state in the interacting region. The efficiency of the current suppression is governed by the ratio between the interdot tunnelling rate and the level offset. In the opposite bias direction, the occupation of the two-electron triplet is lifted which allows a larger current to flow through the system, where the conductance is provided by transitions between one-electron states and two-electron singlet states. It is also shown that a finite ferromagnetic interdot exchange interaction provides an extended range of the current suppression, while an antiferromagnetic exchange leads to a decreased range of the blockade regime.Keywords
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This publication has 32 references indexed in Scilit:
- Triple quantum dot charging rectifierApplied Physics Letters, 2004
- Asymmetric negative differential conductance in double quantum dotsJournal of Physics: Condensed Matter, 2004
- Electron transport through double quantum dotsReviews of Modern Physics, 2002
- Rectifying Behavior in Coulomb Blockades: Charging RectifiersPhysical Review Letters, 2002
- Strongly capacitively coupled quantum dotsApplied Physics Letters, 2002
- Formation of coupled quantum dots in single-wall carbon nanotubesApplied Physics Letters, 2001
- Experimental Tunneling RatchetsScience, 1999
- A quantum dot ratchet: Experiment and theoryEurophysics Letters, 1998
- The Coulomb Blockade in Coupled Quantum DotsScience, 1996
- Artificial AtomsPhysics Today, 1993