TY - GEN
T1 - Spin decay in a quantum dot coupled to a quantum point contact
AU - Borhani, Massoud
AU - Golovach, Vitaly N.
AU - Loss, Daniel
PY - 2008
Y1 - 2008
N2 - We consider a mechanism of spin decay for an electron spin in a quantum dot due to coupling to a nearby quantum point contact (QPC) with and without an applied bias voltage. The coupling of spin to charge is induced by the spin-orbit interaction in the presence of a magnetic field. We perform a microscopic calculation of the effective Hamiltonian coupling constants to obtain the QPC-induced spin relaxation and decoherence rates in a realistic system. This rate is shown to be proportional to the shot noise of the QPC in the regime of large bias voltage and scales as a-6 where a is the distance between the quantum dot and the QPC. We find that, for some specific orientations of the setup with respect to the crystallographic axes, the QPC-induced spin relaxation and decoherence rates vanish, while the charge sensitivity of the QPC is not changed. This result can be used in experiments to minimize QPC-induced spin decay in read-out schemes1.
AB - We consider a mechanism of spin decay for an electron spin in a quantum dot due to coupling to a nearby quantum point contact (QPC) with and without an applied bias voltage. The coupling of spin to charge is induced by the spin-orbit interaction in the presence of a magnetic field. We perform a microscopic calculation of the effective Hamiltonian coupling constants to obtain the QPC-induced spin relaxation and decoherence rates in a realistic system. This rate is shown to be proportional to the shot noise of the QPC in the regime of large bias voltage and scales as a-6 where a is the distance between the quantum dot and the QPC. We find that, for some specific orientations of the setup with respect to the crystallographic axes, the QPC-induced spin relaxation and decoherence rates vanish, while the charge sensitivity of the QPC is not changed. This result can be used in experiments to minimize QPC-induced spin decay in read-out schemes1.
UR - https://www.scopus.com/pages/publications/84903902496
U2 - 10.1142/9789812814623_0041
DO - 10.1142/9789812814623_0041
M3 - Conference contribution
AN - SCOPUS:84903902496
SN - 9812814612
SN - 9789812814616
T3 - MS+S 2006 - Controllable Quantum States: Mesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium
SP - 256
EP - 261
BT - MS+S 2006 - Controllable Quantum States
PB - World Scientific Publishing Co. Pte Ltd
T2 - 4th International Symposium on Mesoscopic Superconductivity and Spintronics, MS+S 2006
Y2 - 27 February 2006 through 2 March 2006
ER -