Charge-localization and isospin-blockade in vertical double quantum dots

Abstract

Charge localization seems unlikely to occur in two vertically coupled symmetric quantum dots even if a small bias voltage breaks the exact isospin-symmetry of the system. However for a three-electron double quantum dot we find a strong localization of charges at certain vertically applied magnetic fields. The charge localization is directly connected to new ground state transitions between eigenstates differing only in parity. The transitions are driven by magnetic field dependent Coulomb correlations between the electrons and give rise to strong isospin blockade signatures in transport through the double dot system.

10 pages, 4 figures

References in corpus (7)

• Hilbert space structure of a solid state quantum computer: two-electron states of a double quantum dot artificial molecule
• Spin interactions and switching in vertically tunnel-coupled quantum dots
• Correlated few-electron states in vertical double-quantum-dot systems
• Dissociation of vertical semiconductor diatomic artificial molecules
• Quantum phases in artificial molecules
• Vertically coupled double quantum dots in magnetic fields
• A vertical diatomic artificial molecule in the intermediate coupling regime in a parallel and perpendicular magnetic field

Cited by in corpus (10)

• Full configuration interaction approach to the few-electron problem in artificial atoms
• Probing level renormalization by sequential transport through double quantum dots
• Two-Particle Dark State in the Transport through a Triple Quantum Dot
• Symmetry of $k\cdot p$ Hamiltonian in pyramidal InAs/GaAs quantum dots: Application to the calculation of electronic structure
• Three-level mixing and dark states in transport through quantum dots
• Vertically coupled double quantum rings at zero magnetic field
• The influence of Coulomb correlations on nonequilibrium quantum transport in quadruple quantum-dot structure
• Thermal transport driven by Coulomb interactions in quantum dots: Enhancement of thermoelectric and heat currents
• Quantum phases of correlated electrons in artificial molecules under magnetic fields
• Isospin Blockade in Transport through Vertical Double Quantum Dots