Ultra long spin decoherence times in graphene quantum dots with a small number of nuclear spins
arXiv:1311.1979 · doi:10.1103/PhysRevB.88.245441
Abstract
We study the dynamics of an electron spin in a graphene quantum dot, which is interacting with a bath of less than ten nuclear spins via the anisotropic hyperfine interaction. Due to substantial progress in the fabrication of graphene quantum dots, the consideration of such a small number of nuclear spins is experimentally relevant. This choice allows us to use exact diagonalization to calculate the longtime average of the electron spin as well as its decoherence time. We investigate the dependence of spin observables on the initial states of nuclear spins and on the position of nuclear spins in the quantum dot. Moreover, we analyze the effects of the anisotropy of the hyperfine interaction for different orientations of the spin quantization axis with respect to the graphene plane. Interestingly, we then predict remarkable long decoherence times of more than 10ms in the limit of few nuclear spins.
13 pages, 10 figures, corrected typos, clarified estimation of decoherence times (results unchanged), extended discussion of spin preparation scheme
References in corpus (40)
- The electronic properties of graphene
- The nitrogen-vacancy colour centre in diamond
- Chaotic Dirac billiard in graphene quantum dots
- 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
- Spin-orbit gap of graphene: First-principles calculations
- Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
- Quantum Darwinism
- Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
- Magnetic confinement of massless Dirac fermions in graphene
- Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
- Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
- Quantum dots in graphene
- Tunable Coulomb blockade in nanostructured graphene
- Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
- Spin-echo of a single electron spin in a quantum dot
- Bound states and magnetic field-induced valley splitting in gate-tunable graphene quantum dots
- Quasi-bound states of quantum dots in single and bilayer graphene
- Observation of excited states in a graphene quantum dot
- Hole - Nuclear Spin Interaction in Quantum Dots
- Tunable few-electron double quantum dots and Klein tunnelling in ultra-clean carbon nanotubes
- Nuclear Spins in Nanostructures
- Spin States in Graphene Quantum Dots
- Hyperfine interaction and electron-spin decoherence in graphene and carbon nanotube quantum dots
- Gate defined zero- and one-dimensional confinement in bilayer graphene
- Quantum Dots at Room Temperature carved out from Few-Layer Graphene
- Long-time electron spin storage via dynamical suppression of hyperfine-induced decoherence in a quantum dot
- Universal Scaling of Hyperfine-Induced Electron Spin Echo Decay
- Time-resolved charge detection in graphene quantum dots
- Quantum Monte Carlo studies of edge magnetism in chiral graphene nanoribbons
- Etched graphene quantum dots on hexagonal boron nitride
- Magnetic Correlations in Short and Narrow Graphene Armchair Nanoribbons
- Spin echo decay at low magnetic fields in a nuclear spin bath
- Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots
- Effective models for strong electronic correlations at graphene edges
- Exact diagonalization study of the tunable edge magnetism in graphene
- Spin decoherence in graphene quantum dots due to hyperfine interaction
- Bosonic field theory of tunable edge magnetism in graphene
- Gate-tunable split Kondo effect in a carbon nanotube quantum dot
Cited by in corpus (10)
- Electrostatically confined monolayer graphene quantum dots with orbital and valley splittings
- Equilibration time scales of physically relevant observables
- Electronic waiting-time distribution of a quantum-dot spin valve
- Spintronics with graphene quantum dots
- Thermal quantum correlations and Teleportation in a Graphene Sheet
- Long-Lived Spin-Polarized Intermolecular Exciplex States in Thermally Activated Delayed Fluorescence-Based Organic Light-Emitting Diodes
- Equilibration in closed quantum systems: Application to spin qubits
- Orbital hyperfine interaction and qubit dephasing in carbon nanotube quantum dots
- The sudden change phenomenon of quantum discord
- Edge channel confinement in a bilayer graphene -- quantum dot