Coherent control of electron and nuclear spin polarization by two-pulse optical Stark effect induced spin rotations
Phys. Rev. B 114, 074302 – Published 3 August, 2026
DOI: https://doi.org/10.1103/sk5r-1rsp
Abstract
The development of a pump-probe spectroscopy scheme to control time- and external field-resolved dynamics of an electron-nuclear spin feedback system in bulk n-GaAs is outlined. Two pump pulses within the repetition rate of a mode-locked laser are optically detuned from the n-GaAs absorption edge to manipulate the Overhauser field produced by the optical Stark effect-induced electron spin rotations. Tunable control over both the strength and direction of the Overhauser field is achieved by arbitrarily adjusting the pump-pump temporal separation, pump polarizations, and pump powers. Unlike the one-pump regime where the Overhauser field depends on and synchronizes to the laser repetition rate, the two-pump scheme provides access to regimes of electron–nuclear spin control that are otherwise inaccessible, thereby enabling finer control over the Overhauser field and subsequent electron-nuclear spin interactions. The accessible regimes of electron-nuclear spin control produced by the outlined two-pump scheme offer a versatile framework for precisely controlling the Stark effect-induced electron-nuclear spin feedback and may be extended to other material systems that optically excite electron and nuclear spin polarization.
