Co-tunneling assisted sequential tunneling in multi-level quantum dots

Abstract

We investigate the conductance and zero-frequency shot noise of interacting, multi-level quantum dots coupled to leads. We observe that co-tunneling assisted sequential tunneling (CAST) processes play a dominant role in the transition region from Coulomb blockade to sequential tunneling. We analyze for intermediate coupling strength the dependence of the conductance due to CAST processes on temperature, coupling constant, and gate voltage. Remarkably, the width of the CAST transport feature scales only with temperature, but not with the coupling constant. While the onset of inelastic co-tunneling is associated with a super-Poissonian noise, the noise is even stronger above the threshold for CAST processes

10 pages including 3 color figures

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• Dephasing-assisted Gain and Loss in Mesoscopic Quantum Systems
• Full counting statistics and shot noise of cotunneling in quantum dots and single-molecule transistors
• Current Noise in Single-Molecule Junctions Induced by Electronic-Vibrational Coupling
• Pair-tunneling resonance in the single-electron transport regime
• Transport mirages in single-molecule devices
• Shot noise spectroscopy on a semiconductor quantum dot in the elastic and inelastic cotunneling regimes
• Counting quantum jumps: a summary and comparison of fixed-time and fluctuating-time statistics in electron transport
• Detecting single-electron tunneling involving virtual processes in real time
• Distribution of waiting times between electron cotunnelings
• Dynamical correlations in electronic transport through a system of coupled quantum dots
• Quantum dot occupation and electron dwell time in the cotunneling regime
• Strongly correlated charge transport in silicon MOSFET quantum dots
• Current noise in quantum dot thermoelectric engines
• Controlling thermoelectric, heat, and energy currents through a quantum dot in sequential and cotunneling Coulomb-blockade regimes