Using spin bias to manipulate and measure quantum spin in quantum dots

Abstract

A double-quantum-dot coupled to electrodes with spin-dependent splitting of chemical potentials (spin bias) is investigated theoretically by means of the Green's functions formalism. By applying a large spin bias, the quantum spin in a quantum dot (the dot 1) can be manipulated in a fully electrical manner. To noninvasively monitor the manipulation of the quantum spin in the dot 1, it is proposed that the second quantum dot (the dot 2) is weakly coupled to the dot 1. In the presence of the exchange interaction between the two dots, the polarized spin in the dot 1 behaves like an effective magnetic field and weakly polarizes the spin in the nearby quantum dot 2. By applying a very small spin bias to the dot 2, the spin-dependent transport through the dot 2 can be probed, allowing the spin polarization in the dot 1 to be identified nondestructively. These two steps form a complete scheme to manipulate a trapped spin while permitting this manipulation to be monitored in the double-dot system using pure electric approaches.

References in corpus (26)

• Spintronics: Fundamentals and applications
• Quantum Computation with Quantum Dots
• Spins in few-electron quantum dots
• Single-shot read-out of an individual electron spin in a quantum dot
• Direct electronic measurement of the spin Hall effect
• Experimental observation of the spin-Hall effect in a two dimensional spin-orbit coupled semiconductor system
• Driven coherent oscillations of a single electron spin in a quantum dot
• Coherent control of a single electron spin with electric fields
• Efficient Electrical Spin Injection from a Magnetic Metal / Tunnel Barrier Contact into a Semiconductor
• Few-Electron Quantum Dot Circuit with Integrated Charge Read-Out
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots
• Coherent coupling of two quantum dots embedded in an Aharonov-Bohm ring
• Electrical Spin Injection in a Ferromagnetic / Tunnel Barrier/ Semiconductor Heterostructure
• Transition between Quantum States in a Parallel-Coupled Double-Quantum-Dot
• A spin-cell for spin current
• Zero-bias spin separation
• Charge Distribution in a Kondo Correlated Quantum Dot
• Non-destructive measurement of electron spins in a quantum dot
• Zero-dimensional spin accumulation and spin dynamics in a mesoscopic metal island
• Spin-selective optical absorption of singly charged excitons in a quantum dot
• Observation of electric current induced by optically injected spin current
• Theoretical study of electronic transport through a small quantum dot with a magnetic impurity
• Spin-Current-Induced Charge Accumulation and Electric Current in Semiconductor Nanostructures with Rashba Spin-Orbit Coupling
• Transverse electric current induced by optically injected spin current in cross-shaped InGaAs/InAlAs system
• Spin Precession and Oscillations in Mesoscopic Systems

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