Anisotropic nuclear-spin diffusion in double quantum wells

Abstract

Nuclear-spin diffusion in double quantum wells (QWs) is examined by using dynamic nuclear polarization (DNP) at a Landau level filling factor $\nu =2/3$ spin phase transition (SPT). The longitudinal resistance increases during the DNP of one of the two QW (the polarization QW) by means of a large applied current and starts to decrease just after the termination of the DNP. On the other hand, the longitudinal resistance of the other QW (the detection QW) continuously increases for approximately 2h after the termination of the DNP of the polarization QW. It is therefore concluded that the nuclear spins diffuse from the polarization QW to the detection QW. The time evolution of the longitudinal resistance of the polarization QW is explained mainly by the nuclear-spin diffusion in the in-plane direction. In contrast, that of the detection QW manifests much slower nuclear diffusion in the perpendicular direction through the AlGaAs barrier.

17 pages, 5 figures, accepted for publication in Physical Review B

References in corpus (15)

• Quantum Computation with Quantum Dots
• Driven coherent oscillations of a single electron spin in a quantum dot
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• High-fidelity readout and control of a nuclear spin qubit in silicon
• An all silicon quantum computer
• Nuclear spin induced oscillatory current in spin-blocked quantum dots
• Two-qubit Gate of Combined Single Spin Rotation and Inter-dot Spin Exchange in a Double Quantum Dot
• Electrically-Controlled Nuclear Spin Polarization and Relaxation by Quantum-Hall states
• A New Type of Electron Nuclear-Spin Interaction from Resistively Detected NMR in the Fractional Quantum Hall Effect Regime
• Exchange Control of Nuclear Spin Diffusion in a Double Quantum Dot
• Suppression of nuclear spin diffusion at a GaAs/AlGaAs interface measured with a single quantum dot nano-probe
• Domain Formation in v=2/3 Fractional Quantum Hall Systems
• Nuclear Polarization in Quantum Point Contacts in an In-Plane Magnetic Field
• Optically induced nuclear spin polarization in a single GaAs/AlGaAs quantum well probed by a resistance detection method in the fractional quantum Hall regime
• Interlayer Diffusion of Nuclear Spin Polarization in $\nu =2/3$ Quantum Hall States

Cited by in corpus (1)

• Landauer-Büttiker approach for hyperfine mediated electronic transport in the integer quantum Hall regime