Theory of Electric Dipole Spin Resonance in a Parabolic Quantum Well

TL;DR

This paper develops a theoretical framework for Electric Dipole Spin Resonance (EDSR) in parabolic quantum wells, providing explicit formulas for EDSR intensity and analyzing how spin-orbit mechanisms and electric field polarization influence spin control efficiency.

Contribution

The paper introduces an explicit theoretical model for EDSR in parabolic quantum wells, highlighting the effects of spin-orbit coupling mechanisms and electric field polarization.

Findings

Explicit expressions for EDSR intensity and angular dependence.

Electrical spin manipulation is highly efficient, especially with in-plane electric fields.

Angular dependence reveals contributions of different spin-orbit mechanisms.

Abstract

A theory of Electric Dipole Spin Resonance (EDSR), that is caused by various mechanisms of spin-orbit coupling, is developed as applied to free electrons in a parabolic quantum well. Choosing a parabolic shape of the well has allowed us to find explicit expressions for the EDSR intensity and its dependence on the magnetic field direction in terms of the basic parameters of the Hamiltonian. By using these expressions, we have investigated and compared the effect of specific mechanisms of spin orbit (SO) coupling and different polarizations of ac electric field on the intensity of EDSR. Angular dependences of the EDSR intensity are indicative of the relative contributions of the competing mechanisms of SO coupling. Our results show that electrical manipulating electron spins in quantum wells is generally highly efficient, especially by an in-plane ac electric field.