Charge Detection in Graphene Quantum Dots

Abstract

We report measurements on a graphene quantum dot with an integrated graphene charge detector. The quantum dot device consists of a graphene island (diameter approx. 200 nm) connected to source and drain contacts via two narrow graphene constrictions. From Coulomb diamond measurements a charging energy of 4.3 meV is extracted. The charge detector is based on a 45 nm wide graphene nanoribbon placed approx. 60 nm from the island. We show that resonances in the nanoribbon can be used to detect individual charging events on the quantum dot. The charging induced potential change on the quantum dot causes a step-like change of the current in the charge detector. The relative change of the current ranges from 10% up to 60% for detecting individual charging events.

4 pages, 3 figures

References in corpus (18)

• Electric Field Effect in Atomically Thin Carbon Films
• Two-Dimensional Gas of Massless Dirac Fermions in Graphene
• The Raman Fingerprint of Graphene
• Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
• Energy Band Gap Engineering of Graphene Nanoribbons
• Chiral tunneling and the Klein paradox in graphene
• Spatially Resolved Raman Spectroscopy of Single- and Few-Layer Graphene
• Chaotic Dirac billiard in graphene quantum dots
• Single-shot read-out of an individual electron spin in a quantum dot
• Graphene Nano-Ribbon Electronics
• Spin qubits in graphene quantum dots
• Phase Coherent Transport of Charges in Graphene Quantum Billiard
• Counting statistics of single-electron transport in a quantum dot
• Tunable Graphene Single Electron Transistor
• Coulomb blockade in graphene nanoribbons
• Tunable Coulomb blockade in nanostructured graphene
• Aharonov-Bohm effect in graphene
• Differential Charge Sensing and Charge Delocalization in a Tunable Double Quantum Dot

Cited by in corpus (49)

• Electron-Electron Interactions in Graphene: Current Status and Perspectives
• Properties of Graphene: A Theoretical Perspective
• Energy gaps in etched graphene nanoribbons
• Electronic properties of mesoscopic graphene structures: charge confinement and control of spin and charge transport
• Robustness of edge states in graphene quantum dots
• Transport gap in side-gated graphene constrictions
• Electron-Hole Crossover in Graphene Quantum Dots
• Electrostatic confinement of electrons in graphene nano-ribbons
• Spin and Valley States in Gate-defined Bilayer Graphene Quantum Dots
• Wave function mapping in graphene quantum dots with soft confinement
• Electronic and optical properties of graphene nanoribbons in external fields
• A Graphene Quantum Dot with a Single Electron Transistor as Integrated Charge Sensor
• Probing relaxation times in graphene quantum dots
• Recent progresses of quantum confinement in graphene quantum dots
• Gate-defined electron-hole double dots in bilayer graphene
• Single-electron double quantum dots in bilayer graphene
• Charge detection in gate-defined bilayer graphene quantum dots
• Time-resolved charge detection in graphene quantum dots
• Edge effects in graphene nanostructures: I. From multiple reflection expansion to density of states
• Coherent transport through graphene nanoribbons in the presence of edge disorder
• Transition to Landau Levels in Graphene Quantum Dots
• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• Graphene quantum dots in perpendicular magnetic fields
• Gates controlled parallel-coupled double quantum dot on both single layer and bilayer graphene
• Charge detection in a bilayer graphene quantum dot
• Single-electron Transport in Graphene-like Nanostructures
• Quantum dot behavior in transition metal dichalcogenides nanostructures
• Graphene-based charge sensors
• Edge effects in graphene nanostructures: II. Semiclassical theory of spectral fluctuations and quantum transport
• Electronic triple-dot transport through a bilayer graphene island with ultrasmall constrictions
• From diffusive to ballistic transport in etched graphene constrictions and nanoribbons
• Transport through a strongly coupled graphene quantum dot in perpendicular magnetic field
• Transport in coupled graphene-nanotube quantum devices
• Negative quantum capacitance in graphene nanoribbons with lateral gates
• Influence of electric and magnetic fields and $\sigma$-edge bands on the electronic and optical spectra of graphene nanoribbons
• Gate-defined coupled quantum dots in topological insulators
• Single-Electron Transistor Made of a 3D Topological Insulator Nanoplate
• Electrostatic detection of Shubnikov-de-Haas oscillations in bilayer graphene by Coulomb resonances in gate-defined quantum dots
• Edge states versus diffusion in disordered graphene flakes
• A strain-engineered graphene qubit in a nanobubble
• Tunable Charge Detectors for Semiconductor Quantum Circuits
• Graphene quantum dots probed by scanning tunneling spectroscopy and transport spectroscopy after local anodic oxidation
• Finite bias spectroscopy of a three-terminal graphene quantum dot in the multi-level regime
• Back action of graphene charge detectors on graphene and carbon nanotube quantum dots
• Role of electron-electron interaction in the Mpemba effect in quantum dots
• Magnetic field induced charge redistribution in disordered graphene double quantum dots
• Capacitive coupling in hybrid Graphene-GaAs nanostructures
• Charging graphene nanoribbon quantum dots
• Haldane graphene billiards versus relativistic neutrino billiards