Zero-bias anomaly in cotunneling transport through quantum-dot spin valves

Abstract

We predict a new zero-bias anomaly in the differential conductance through a quantum dot coupled to two ferromagnetic leads with antiparallel magnetization. The anomaly differs in origin and properties from other anomalies in transport through quantum dots, such as the Kondo effect. It occurs in Coulomb-blockade valleys with an unpaired dot electron. It is a consequence of the interplay of single- and double-barrier cotunneling processes and their effect on the spin accumulation in the dot. The anomaly becomes significantly modified when a magnetic field is applied.

4 pages, 3 figures

References in corpus (17)

• Low Temperature Transport through a Quantum Dot: The Anderson Model out of Equilibrium
• Mesoscopic quantum transport: Resonant tunneling in the presence of strong Coulomb interaction
• Resonant tunneling through ultrasmall quantum dots: zero-bias anomalies, magnetic field dependence, and boson-assisted transport
• Kondo effect in quantum dots coupled to ferromagnetic leads
• Quantum Dot as Spin Filter and Spin Memory
• Electron Cotunneling in a Semiconductor Quantum Dot
• Theory of Transport through Quantum-Dot Spin Valves in the Weak-Coupling Regime
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Interaction-driven spin precession in quantum-dot spin valves
• Kondo effect in a quantum dot coupled to ferromagnetic leads: A numerical renormalization group analysis
• Cotunneling Spectroscopy in Few-Electron Quantum Dots
• Measurements of Kondo and spin splitting in single-electron transistors
• Current and power spectrum in a magnetic tunnel device with an atomic size spacer
• Transport through a double quantum dot in the sequential- and co- tunneling regimes
• Using single quantum states as spin filters to study spin polarization in ferromagnets
• Effect of Quantum Confinement on Electron Tunneling through a Quantum Dot
• Coulomb and Spin blockade of two few-electrons quantum dots in series in the co-tunneling regime

Cited by in corpus (31)

• Tunnel magnetoresistance of quantum dots coupled to ferromagnetic leads in the sequential and cotunneling regimes
• Quantum Dot as a Spin--Current Diode
• Spin effects in single electron tunneling
• Frequency-Dependent Current Noise through Quantum-Dot Spin Valves
• Effects of different geometries on the conductance, shot noise and tunnel magnetoresistance of double quantum dots
• Transport through quantum-dot spin valves containing magnetic impurities
• Spin-resolved Andreev transport through double-quantum-dot Cooper pair splitters
• Cotunneling through quantum dots coupled to magnetic leads: zero-bias anomaly for non-collinear magnetic configurations
• Observation of spin-selective tunneling in SiGe nanocrystals
• Superconducting proximity effect and zero-bias anomaly in transport through quantum dots weakly attached to ferromagnetic leads
• Adiabatic pumping in a double-dot Cooper-pair beam splitter
• Effect of intrinsic spin relaxation on the spin-dependent cotunneling transport through quantum dots
• Spin resonance without spin splitting
• Transient Charging and Discharging of Spin-polarized Electrons in a Quantum Dot
• Thermoelectric spin accumulation and long-time spin precession in a non-collinear quantum dot spin valve
• Shot noise and tunnel magnetoresistance in multilevel quantum dots: Effects of cotunneling
• Theory of spin pumping through an interacting quantum dot tunnel coupled to a ferromagnet with time-dependent magnetization
• Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime
• Quantum dot with ferromagnetic leads: a density-matrix renormalization group study
• Controlling spin polarization of a quantum dot via a helical edge state
• Spin-dependent transport through quantum-dot Aharonov-Bohm interferometers
• The Aharonov-Bohm-Casher ring-dot as a flux-tunable resonant tunneling diode
• Transport through two-level quantum dots weakly coupled to ferromagnetic leads
• Cotunneling through two-level quantum dots weakly coupled to ferromagnetic leads
• Asymmetry-induced effects in Kondo quantum dots coupled to ferromagnetic leads
• Theory of transport through noncollinear single-electron spin-valve transistors
• Iterative path-integral summations for the tunneling magnetoresistance in interacting quantum-dot spin valves
• Kondo effect in a Aharonov-Casher interferometer
• Current fluctuations of noncollinear single-electron spin-valve transistors
• Influence of spin-flip on the performance of the spin-diode
• Controlling inelastic cotunneling through an interacting quantum dot by a circularly-polarized field