Footprints of hyperfine, spin-orbit, and decoherence effects in Pauli spin blockade

Abstract

We detect in real time inter-dot tunneling events in a weakly coupled two electron double quantum dot in GaAs. At finite magnetic fields, we observe two characteristic tunneling times, T_d and T_b, belonging to, respectively, a direct and a blocked (spin-flip-assisted) tunneling. The latter corresponds to lifting of a Pauli spin blockade and the tunneling times ratio eta=T_b/T_d characterizes the blockade efficiency. We find pronounced changes in the behavior of eta upon increasing the magnetic field, with eta increasing, saturating and increasing again. We explain this behavior as due to the crossover of the dominant blockade lifting mechanism from the hyperfine to spin-orbit interactions and due to a change in the contribution of the charge decoherence.

12 pages, 7 figures

References in corpus (52)

• Quantum Computation with Quantum Dots
• Spins in few-electron quantum dots
• Single-shot read-out of an individual electron spin in a quantum dot
• Coherent control of a single electron spin with electric fields
• Electron spin relaxation by nuclei in semiconductor quantum dots
• Electron spin decoherence in quantum dots due to interaction with nuclei
• Coherent manipulation of electronic states in a double quantum dot
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
• Triplet-Singlet Spin Relaxation via Nuclei in a Double Quantum Dot
• Spin-flip transitions between Zeeman sublevels in semiconductor quantum dots
• Manipulation of a single charge in a double quantum dot
• Prospects for Spin-Based Quantum Computing
• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Quantum Coherence in a One-Electron Semiconductor Charge Qubit
• Relaxation, dephasing, and quantum control of electron spins in double quantum dots
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Rapid Single-Shot Measurement of a Singlet-Triplet Qubit
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Nuclear spin induced oscillatory current in spin-blocked quantum dots
• Singlet-triplet spin blockade and charge sensing in a few-electron double quantum dot
• Electrical control of spin relaxation in a quantum dot
• Spin-orbit coupling effects on quantum transport in lateral semiconductor dots
• Fast sensing of double-dot charge arrangement and spin state with an rf sensor quantum dot
• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Pauli Spin Blockade in the Presence of Strong Spin-Orbit Coupling
• Spin-Orbit Coupling, Antilocalization, and Parallel Magnetic Fields in Quantum Dots
• Electron Transport in Double Quantum Dot governed by Nuclear Magnetic Field
• Disentangling the effects of spin-orbit and hyperfine interactions on spin blockade
• Theory of phonon-induced spin relaxation in laterally coupled quantum dots
• Singlet-triplet splitting in double quantum dots due to spin orbit and hyperfine interactions
• Fast Electrical Control of Single Electron Spins in Quantum Dots with Vanishing Influence from Nuclear Spins
• Single Shot Charge Detection Using A Radio-Frequency Quantum Point Contact
• Quenching of dynamic nuclear polarization by spin-orbit coupling in GaAs quantum dots
• Orbital and spin relaxation in single and coupled quantum dots
• Quantum dephasing in a gated GaAs triple quantum dot due to nonergodic noise
• Theory of anisotropic exchange in laterally coupled quantum dots
• Measuring the degeneracy of discrete energy levels using a GaAs/AlGaAs quantum dot
• Spin relaxation anisotropy in a GaAs quantum dot
• Simultaneous Spin-Charge Relaxation in Double Quantum Dots
• Full control of quadruple quantum dot circuit charge states in the single electron regime
• Semi-classical model for the dephasing of a two-electron spin qubit coupled to a coherently evolving nuclear spin bath
• Spin orbit coupling at the level of a single electron
• Spin-orbit coupling and anisotropic exchange in two-electron double quantum dots
• Nuclear Spin Dynamics in Double Quantum Dots: Fixed Points, Transients, and Intermittency
• Theory of Spin Relaxation in Two-Electron Lateral Coupled Quantum Dots
• Optimal geometry of lateral GaAs and Si/SiGe quantum dots for electrical control of spin qubits
• Tuning the electrically evaluated electron Lande g factor in GaAs quantum dots and quantum wells of different well widths
• Single Photoelectron Detection after Selective Excitation of Electron-Heavy Hole and Electron-Light Hole Pairs in Double Quantum Dots
• Spin state readout by quantum jump technique: for the purpose of quantum computing
• Non-linear spin to charge conversion in mesoscopic structures

Cited by in corpus (21)

• Hyperfine-phonon spin relaxation in a single-electron GaAs quantum dot
• Spin shuttling in a silicon double quantum dot
• Measuring the degeneracy of discrete energy levels using a GaAs/AlGaAs quantum dot
• Single photoelectron spin detection and angular momentum transfer in a gate defined quantum dot
• Anisotropy and suppression of spin--orbit interaction in a GaAs double quantum dot
• Landau-Zener-Stuckelberg-Majorana interferometry of a single hole
• Spin blockade as a probe of Zeeman interactions in hole quantum dots
• Maxwell's demon in a double quantum dot with continuous charge detection
• Waiting time distribution revealing the internal spin dynamics in a double quantum dot
• Quantum state transfer of angular momentum via single electron photo-excitation from a Zeeman-resolved light hole
• Detecting parity effect in a superconducting device in the presence of parity switches
• Leakage and sweet spots in triple-quantum-dot spin qubits: A molecular-orbital study
• Variable and orbital-dependent spin-orbit field orientations in a InSb double quantum dot characterized via dispersive gate sensing
• Non-reciprocal Pauli Spin Blockade in a Silicon Double Quantum Dot
• Full Counting Statistics of Spin-Flip/Conserving Charge Transitions in Pauli-Spin Blockade
• Real-time observation of charge-spin cooperative dynamics driven by a nonequilibrium phonon environment
• Electrical readout of spins in the absence of spin blockade
• High mobility transport in isotopically-enriched ${}^{12}$C and ${}^{13}$C exfoliated graphene
• Room-Temperature Pauli Spin Blockade and Current Rectification in 15-13-15 Armchair Graphene Nanoribbon Heterostructures
• Phonon-mediated spin dynamics in a two-electron double quantum dot under a phonon temperature gradient
• Electron g-factor determined for quantum dot circuit fabricated from (110)-oriented GaAs quantum well