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HL: Fachverband Halbleiterphysik
HL 75: Poster IIIB
HL 75.23: Poster
Donnerstag, 19. März 2020, 15:00–17:30, P2/3OG
Auger Electron Detected Magnetic Resonance — •David Vogl, Paul Steinacker, and Martin S. Brandt — Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4, 85478 Garching, Germany
For plausible quantum storage applications, long coherence times are required. As Silicon is one of the purest and best-understood materials in the world, it is a natural candidate for such implementations. We investigate and set up a measurement technique for the initialization, manipulation, and readout of electron and nuclear spins of shallow Phosphorus donors in highly isotopically purified 28Si utilizing the spin-dependent and resonant excitation of donor-bound excitons and their successive Auger decay. This method was first implemented by the Thewalt group, who were able to demonstrate coherence times in the order of tens of minutes for the ionized donors at room temperature. In our work, we explore this spin system in detail, applying typical pulsed microwave sequences to measure Rabi oscillations, Ramsey fringes, and Hahn echo decays. We observe beatings in the electron spin Rabi oscillation and are able to selectively generate spin hyperpolarization of the 31P nuclei via a cross relaxation. This technique is also applicable to donors with nuclear spin higher than 1/2, which opens up the possibility of examining the quadrupolar spin interaction in more detail.