SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.49: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

Strongly driven germanium qubit — •Bashab Dey and John Schliemann — Institute for Theoretical Physics, University of Regensburg, Regensburg, Germany

Hole qubits in germanium heterostructures are promising candidates for coherent control and manipulation of the spin degree of freedom by electric dipole spin resonance. The suppression of contact hyperfine interaction due to p-type character of the holes, possibility of nuclear-spin free isotopes and absence of valley degeneracies in germanium are favourable for sustaining longer spin coherence and relaxation times in these qubits. We study the time dynamics of a germanium qubit confined laterally by a parabolic potential and strongly driven by coherent circularly polarized radiation in presence of p-cubic Rashba spin-orbit coupling and perpendicular magnetic field. We calculate the transition rates between the lowest (Zeeman-split) levels of the qubit using Floquet theory. We observe peculiar beating patterns in the Rabi oscillations which depend on the strength of the driving field. When the driving frequency is resonant with Zeeman gap, the maxima of the oscillations is a decreasing function of driving amplitude which is in contrast to that of a harmonically driven two-level system. Furthermore, the time period of oscillations, time interval between the beating nodes and the number of oscillations between the nodes also decrease with the radiation amplitude.