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

References in corpus (9)

• Franck-Condon blockade and giant Fano factors in transport through single molecules
• Full counting statistics of super-Poissonian shot noise in multi-level quantum dots
• Co-tunneling current and shot noise in quantum dots
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Cited by in corpus (12)

• Electron counting in quantum dots
• Noise enhancement due to quantum coherence in coupled quantum dots
• Effects of different geometries on the conductance, shot noise and tunnel magnetoresistance of double quantum dots
• Full counting statistics of transport through two-channel Coulomb blockade systems
• Tunable dynamical channel blockade in double-dot Aharonov-Bohm interferometers
• The connection between noise and quantum correlations in a double quantum dot
• Detecting single-electron tunneling involving virtual processes in real time
• First-order coherent resonant tunneling through an interacting coupled-quantum-dot interferometer: generic quantum rate equations and current noise
• Negative differential resistance in nanoscale transport in the Coulomb blockade
• Co-tunneling assisted sequential tunneling in multi-level quantum dots
• Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime
• Spin-dependent current noises in transport through coupled quantum dots