Pulsed-gate spectroscopy of single-electron spin states in bilayer graphene quantum dots

Abstract

Graphene and bilayer graphene quantum dots are promising hosts for spin qubits with long coherence times. Although recent technological improvements make it possible to confine single electrons electrostatically in bilayer graphene quantum dots, and their spin and valley texture of the single particle spectrum has been studied in detail, their relaxation dynamics remains still unexplored. Here, we report on transport through a high-frequency gate controlled single-electron bilayer graphene quantum dot. By transient current spectroscopy of single-electron spin states, we extract a lower bound of the spin relaxation time of 0.5~$\mu$s. This result represents an important step towards the investigation of spin coherence times in graphene-based quantum dots and the implementation of spin-qubits.

6 Pages, 4 Figures

References in corpus (8)

• Gate-induced insulating state in bilayer graphene devices
• Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
• Spin qubits in graphene quantum dots
• Spin-orbit coupling in curved graphene, fullerenes, nanotubes, and nanotube caps
• Zeeman energy and spin relaxation in a one-electron quantum dot
• Spin States in Graphene Quantum Dots
• Excited states in bilayer graphene quantum dots
• Reactive-Ion-Etched Graphene Nanoribbons on a Hexagonal Boron Nitride Substrate

Cited by in corpus (19)

• Nanomaterials for Quantum Information Science and Engineering
• Spin relaxation in a single-electron graphene quantum dot
• Particle-hole symmetry protects spin-valley blockade in graphene quantum dots
• Single-shot readout in graphene quantum dots
• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• Theory of tunneling spectra for a few-electron bilayer graphene quantum dot
• Spin-valley locked excited states spectroscopy in a one-particle bilayer graphene quantum dot
• Mechanical control of quantum transport in graphene
• Radio-frequency reflectometry in bilayer graphene devices utilizing micro graphite back-gates
• Scattering of topological kink-antikink states in bilayer graphene structures
• Extended Hubbard model describing small multi-dot arrays in bilayer graphene
• Switching spin filling sequence in a bilayer graphene quantum dot through trigonal warping
• Phonon-limited valley life times in single-particle bilayer graphene quantum dots
• Geometry effects in topologically confined bilayer graphene loops
• Tuning confined states and valley g-factors by quantum dot design in bilayer graphene
• Quantum Transport Straintronics and Mechanical Aharonov-Bohm Effect in Quasi-metallic SWCNTs
• Conductance of electrostatic wire junctions in bilayer graphene
• Trivial and topological bound states in bilayer graphene quantum dots and rings
• Electrostatic tuning of bilayer graphene edge modes