Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot

Abstract

We report electronic control and measurement of an imbalance between spin-up and spin-down electrons in micron-scale open quantum dots. Spin injection and detection was achieved with quantum point contacts tuned to have spin-selective transport, with four contacts per dot for realizing a non-local spin-valve circuit. This provides an interesting system for studies of spintronic effects since the contacts to reservoirs can be controlled and characterized with high accuracy. We show how this can be used to extract in a single measurement the relaxation time for electron spins inside the dot ~ 300 ps and the degree of spin polarization of the contacts P ~ 0.8.

4 pages, 4 figures

References in corpus (6)

• Electronic spin transport and spin precession in single graphene layers at room temperature
• Electrical Detection of Spin Transport in Lateral Ferromagnet-Semiconductor Devices
• The Statistical Theory of Quantum Dots
• Detecting Spin-Polarized Currents in Ballistic Nanostructures
• The influence of device geometry on many-body effects in quantum point contacts: Signatures of the 0.7 anomaly, exchange and Kondo
• Excess conductance of a spin-filtering quantum dot

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• Spin accumulation with spin-orbit interaction
• Charge and spin transport through normal lead coupled to $s$-wave superconductor and a Majorana zero mode
• Spin-to-Charge Conversion of Mesoscopic Spin Currents
• Nonequilibrium Keldysh Formalism for Interacting Leads -- Application to Quantum Dot Transport Driven by Spin Bias
• Optical probing of spin dynamics of two-dimensional and bulk electrons in a GaAs/AlGaAs heterojunction system
• Spin-current quantization in a quantum point contact with spin-orbit interaction
• Non-linear spin to charge conversion in mesoscopic structures
• Kinetics of Spin Relaxation in Wires and Channels: Boundary Spin Echo and Tachyons
• Dependence of the 0.5(2e2/h) conductance plateau on the aspect ratio of InAs quantum point contacts with in-plane side gates
• Enhancement mechanism of the electron g-factor in quantum point contacts
• Dynamics of Spin Relaxation in Finite-Size 2D Systems: an Exact Solution
• Metastable and spin-polarized states in electron systems with localized electron-electron interaction
• Suppression of Spin Dephasing in a Two-Dimensional Electron Gas with a Quantum Point Contact