Spin-dependent current through a quantum dot from spin-polarized non-equilibrium quantum Hall edge channels

Abstract

We report selective injection of both spin-up and spin-down single electrons into a quantum dot (QD) from spin-polarized non-equilibrium quantum Hall edge channels (ECs) generated by selective transmission of spin-resolved ECs using a surface gate placed at a distance from the QD. We change the spin polarization of non-equilibrium ECs by changing the bias voltages applied to different source Ohmic contacts. The efficiency of spin-up electron injection reaches 0.5, which is approximately 0.2 higher than that induced by spin-dependent tunnel coupling between QD and ECs. On the other hand, the efficiency of spin-down electron injection reaches 0.4. In addition, we rectify the underestimation of the efficiency of spin filtering for equilibrium ECs by numerically subtracting the contribution of the excited states in the QD. The obtained spin-filtering efficiency is higher than that evaluated from the raw experimental data and increases with magnetic field as expected with the increase in the spatial separation between ECs.

8 pages, 7 figures

References in corpus (17)

• Coherent control of a single electron spin with electric fields
• Electrically driven single electron spin resonance in a slanting Zeeman field
• The Addition Spectrum of a Lateral Dot from Coulomb and Spin Blockade Spectroscopy
• Electric Field Control of Spin Transport
• Quantum Dot as Spin Filter and Spin Memory
• Self-Consistent Measurement and State Tomography of an Exchange-Only Spin Qubit
• Non-Equilibrium Edge Channel Spectroscopy in the Integer Quantum Hall Regime
• Energy Relaxation in the Integer Quantum Hall Regime
• Semiconductor few-electron quantum dot operated as a bipolar spin filter
• Spin transport through a single self-assembled InAs quantum dot with ferromagnetic leads
• Electric-field control of tunneling magnetoresistance effect in a Ni/InAs/Ni quantum-dot spin valve
• Single to quadruple quantum dots with tunable tunnel couplings
• Experimental Spin Ratchet
• Mesoscopic one-way channels for quantum state transfer via the Quantum Hall Effect
• Controlled coupling of spin-resolved quantum Hall edge states
• Multiple transitions of the spin configuration in quantum dots
• Detection of spin polarization utilizing singlet and triplet states in a single-lead quantum dot

Cited by in corpus (6)

• Spin of a multielectron quantum dot and its interaction with a neighboring electron
• Long-Distance Entanglement of Spin Qubits via Quantum Hall Edge States
• Statistical theory of relaxation of high energy electrons in quantum Hall edge states
• Nonlocal Andreev transport through a quantum dot in a magnetic field: Interplay between Kondo, Zeeman, and Cooper-pair correlations
• Preparation and Readout of Multielectron High-Spin States in a Gate-Defined GaAs/AlGaAs Quantum Dot
• Noise suppression and long-range exchange coupling for gallium arsenide spin qubits