Shot noise in transport through "double quantum dots"

Abstract

Motivated by activities of several experimental groups we investigate electron transport through two coherent, strongly coupled quantum dots ("double quantum dots"), taking into account both intra- and inter-dot Coulomb interactions. The shot noise in this system is very sensitive to the internal electronic level structure of the coupled dot system and its specific coupling to the electrodes. Accordingly a comparison between experiments and our predictions should allow for a characterization of the relevant parameters. We discuss in detail the effect of asymmetries, either asymmetries in the couplings to the electrodes or a detuning of the quantum dot levels out of resonance with each other. In the Coulomb blockade region super-Poissonian noise appears even for symmetric systems. For bias voltages above the sequential tunneling threshold super-Poissonian noise and regions of negative differential conductance develop if the symmetry is broken sufficiently strongly.

11 pages, 8 figures, submitted to PRB

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• Transport Statistics of Interacting Double Dot Systems: Coherent and Non-Markovian Effects
• Green function techniques in the treatment of quantum transport at the molecular scale
• Full counting statistics of transport through two-channel Coulomb blockade systems
• Tunable dynamical channel blockade in double-dot Aharonov-Bohm interferometers
• Negative tunnel magnetoresistance and differential conductance in transport through double quantum dots
• Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system
• Large-deviation analysis for counting statistics in mesoscopic transports
• The connection between noise and quantum correlations in a double quantum dot
• Detecting single-electron tunneling involving virtual processes in real time
• Gauge freedom in observables and Landsbergs nonadiabatic geometric phase: pumping spectroscopy of interacting open quantum systems
• First-order coherent resonant tunneling through an interacting coupled-quantum-dot interferometer: generic quantum rate equations and current noise
• Shot noise in non-adiabatically driven nanoscale conductors
• Negative differential resistance in nanoscale transport in the Coulomb blockade
• Enhanced current noise correlations in a Coulomb-Majorana device
• Effect of finite Coulomb interaction on full counting statistics of electronic transport through single-molecule magnet
• Effects of magnetic field and transverse anisotropy on full counting statistics in single-molecule magnet
• Co-tunneling assisted sequential tunneling in multi-level quantum dots
• Strongly enhanced shot noise in chains of quantum dots
• Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime
• Quantum Equilibration under Constraints and Transport Balance
• Full counting statistics as a probe of quantum coherence in a side-coupled double quantum dot system
• Negative Differential Conductance in Nano-junctions: A Current Constrained Approach
• Transport Signatures of a Majorana Qubit and Read-out-induced Dephasing
• Theory of a.c. spin current noise and spin conductance through a quantum dot in the Kondo regime I: The equilibrium case
• Spin-dependent current noises in transport through coupled quantum dots
• Quantum noise theory for quantum transport through nanostructures
• Manipulation and readout of spin states of a single-molecule magnet by a spin-polarized current
• Magnetic-flux-controlled giant Fano factor for the coherent tunneling through a parallel double-quantum-dot
• Finite-frequency noise, Fano factor, $\Delta T$-noise and cross-correlations in double quantum dots
• Negative differential conductance and super-Poissonian shot noise in single-molecule magnet junctions