Voltage-Selective Bi-directional Polarization and Coherent Rotation of Nuclear Spins in Quantum Dots

Abstract

We proposed and demonstrated that the nuclear spins of the host lattice in GaAs double quantum dots can be strongly polarized in either of two opposite directions, parallel or antiparallel to an external magnetic field. The direction is selected simply by adjusting the dc source-drain voltage of the device. This nuclear polarization manifests itself by repeated controlled electron-nuclear spin scattering in the Pauli spin blockade state. Polarized nuclei are also controlled coherently by means of nuclear magnetic resonance (NMR). This work confirmed that the nuclear spins in quantum dots are indeed long-lived quantum states with a coherence time of up to 1 ms, and may be a promising resource for quantum information processing such as quantum memories for electron spin qubits.

11 pages, 4 figures

References in corpus (9)

• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Entanglement in a Solid State Spin Ensemble
• Dynamic Nuclear Polarization with Single Electron Spins
• Suppression of spin relaxation in an InAs nanowire double quantum dot
• Measurement of Temporal Correlations of the Overhauser Field in a Double Quantum Dot
• Large nuclear Overhauser fields detected in vertically-coupled double quantum dots
• Pauli spin blockade in carbon nanotube double quantum dots
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Cited by in corpus (17)

• Nuclear spin physics in quantum dots: an optical investigation
• Controlling the quantum dynamics of a mesoscopic spin bath in diamond
• Generating Entanglement and Squeezed States of Nuclear Spins in Quantum Dots
• Superradiance-like Electron Transport through a Quantum Dot
• Steady-State Entanglement in the Nuclear Spin Dynamics of a Double Quantum Dot
• Nuclear Spin Dynamics in Double Quantum Dots: Multi-Stability, Dynamical Polarization, Criticality and Entanglement
• Dynamic nuclear polarization in InGaAs/GaAs and GaAs/AlGaAs quantum dots under non-resonant ultra-low power optical excitation
• Observation of Hysteretic Transport Due to Dynamic Nuclear Spin Polarization in a GaAs Lateral Double Quantum Dot
• Electrical current and coupled electron-nuclear spin dynamics in double quantum dots
• Preparation of Non-equilibrium Nuclear Spin States in Double Quantum Dots
• The theory of coherent dynamic nuclear polarization in quantum dots
• Near-threshold properties of the electronic density of layered quantum-dots
• Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve
• Temperature-dependent dynamical nuclear polarization bistabilities in double quantum dots in the spin-blockade regime
• Resonance states in a cylindrical quantum dot with an external magnetic field
• Dipolar broadening of nuclear spin resonance under dynamical pumping
• Superradiant-like dynamics by electron shuttling on a nuclear-spin island