Negative tunnel magnetoresistance and differential conductance in transport through double quantum dots

Abstract

Spin-dependent transport through two coupled single-level quantum dots weakly connected to ferromagnetic leads with collinear magnetizations is considered theoretically. Transport characteristics, including the current, linear and nonlinear conductance, and tunnel magnetoresistance are calculated using the real-time diagrammatic technique in the parallel, serial, and intermediate geometries. The effects due to virtual tunneling processes between the two dots via the leads, associated with off-diagonal coupling matrix elements, are also considered. Negative differential conductance and negative tunnel magnetoresistance have been found in the case of serial and intermediate geometries, while no such behavior has been observed for double quantum dots coupled in parallel. It is also shown that transport characteristics strongly depend on the magnitude of the off-diagonal coupling matrix elements.

12 pages, 13 figures

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Cited by in corpus (17)

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• Spin-resolved Andreev transport through double-quantum-dot Cooper pair splitters
• The formation of nonequilibrium steady states in interacting double quantum dots: When coherences dominate the charge distribution
• Probing the exchange field of a quantum-dot spin valve by a superconducting lead
• Charge and spin pumping through a double quantum dot
• Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system
• Sharp peaks in the conductance of double quantum dot and quantum dot spin-valve systems at high temperatures: A hierarchical quantum master equation approach
• Waiting time distribution revealing the internal spin dynamics in a double quantum dot
• Finite coupling effects in double quantum dots near equilibrium
• Influence of spin waves on transport through a quantum-dot spin valve
• Sources of negative tunneling magneto-resistance in multilevel quantum dots with ferromagnetic contacts
• Tunneling-induced renormalization in interacting quantum dots
• Pseudospin resonances reveal synthetic spin-orbit interaction
• Thermal transport driven by Coulomb interactions in quantum dots: Enhancement of thermoelectric and heat currents
• A T-shaped double quantum dot system as a Fano interferometer: interplay of coherence and correlation upon spin currents
• Negative differential magneto-resistance in ferromagnetic wires with domain walls
• Current Rectification and Seebeck Coefficient of Serially Coupled Double Quantum Dots