Controlling spin without magnetic fields -- the Bloch-Rashba rotator

Abstract

We consider the dynamics of a quantum particle held in a lattice potential, and subjected to a time-dependent spin-orbit coupling. Tilting the lattice causes the particle to perform Bloch oscillations, and by suitably changing the Rashba interaction during its motion, the spin of the particle can be gradually rotated. Even if the Rashba coupling can only be altered by a small amount, large spin-rotations can be obtained by accumulating the rotation from successive oscillations. We show how the time-dependence of the spin-orbit coupling can be chosen to maximize the rotation per cycle, and thus how this method can be used to produce a precise and controllable spin-rotator, the Bloch-Rashba rotator, without requiring an applied magnetic field.

6 pages, 6 figures. V2: minor changes, added references

References in corpus (9)

• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Driven coherent oscillations of a single electron spin in a quantum dot
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Orbital mechanisms of electron spin manipulation by an electric field
• Strong tuning of Rashba spin orbit interaction in single InAs nanowires
• Spin-Orbit Mediated Control of Spin Qubits
• Bloch Oscillations in Optical and Zeeman Lattices in the Presence of Spin-Orbit Coupling
• Spin transport through a quantum network: Effects of Rashba spin orbit interaction and Aharonov-Bohm flux
• Electric-dipole-induced spin resonance in a lateral double quantum dot incorporating two single domain nanomagnets