Background charges and quantum effects in quantum dots transport spectroscopy

Abstract

We extend a simple model of a charge trap coupled to a single-electron box to energy ranges and parameters such that it gives new insights and predictions readily observable in many experimental systems. We show that a single background charge is enough to give lines of differential conductance in the stability diagram of the quantum dot, even within undistorted Coulomb diamonds. It also suppresses the current near degeneracy of the impurity charge, and yields negative differential lines far from this degeneracy. We compare this picture to two other accepted explanations for lines in diamonds, based respectively on the excitation spectrum of a quantum dot and on fluctuations of the density-of-states in the contacts. In order to discriminate between these models we emphasize the specific features related to environmental charge traps. Finally we show that our model accounts very well for all the anomalous features observed in silicon nanowire quantum dots.

7 pages, 6 figures

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• Tunable Kondo effect in a single donor atom
• Single-dopant resonance in a single-electron transistor
• Pauli Blockade in a Few-Hole PMOS Double Quantum Dot limited by Spin-Orbit Interaction
• Probe and Control of the Reservoir Density of States in Single-Electron Devices
• Defect detection in nano-scale transistors based on radio-frequency reflectometry
• Theoretical Investigation of Charge Transfer Between Two Defects in a Wide-Bandgap Semiconductor
• Finite bias spectroscopy of a three-terminal graphene quantum dot in the multi-level regime
• Electric-field independent spin-orbit coupling gap in hBN-encapsulated bilayer graphene
• Localization effects in the tunnel barriers of phosphorus-doped silicon quantum dots