Spin interference controlled by electric field: Ensemble average effect on AAS and AB oscillation amplitudes

Time reversal symmetric Al’tshuler–Aronov–Spivak (AAS) oscillations are measured in an array of InGaAs mesoscopic loops. We confirm that gate voltage dependence of h/2e period oscillations is due to spin interference from the effect of ensemble average on the AAS and Aharonov–Bohm (AB) amplitudes. This spin interference is based on the time reversal Aharonov–Casher (AC) effect. The AC interference oscillations are controlled over several periods. This result shows evidence for electrical manipulation of the spin precession angle in an InGaAs two-dimensional electron gas channel. We control the precession rate in a precise and predictable way with an electrostatic gate.