Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 95: Spintronics/Quantum information: Vacancies in diamond and SiC (HL, jointly with TT)
HL 95.4: Vortrag
Freitag, 15. März 2013, 10:15–10:30, H14
A novel metastable spin triplet in diamond — •Matthias Widmann1, Sang-Yun Lee1, Helmut Fedder1, Torsten Rendler1, Moritz Eyer1, Sen Yang1, Petr Siyushev1, Marcus Doherty2, and Jörg Wrachtrup1 — 13. Physikalisches Institut, University Stuttgart, Germany — 2Laser Physics Center, National University, Canberra, Australia
In this talk a newly found, photo stable single spin center in a HTHP diamond nano-pillar, will be introduced. This new defect poses many properties, similar to those of the well-known NV-center in diamond. However, optically detected magnetic resonance showed positive contrast at room temperature in contrast to NV-centers. The photo physics and spin physics of this new defect have been studied to understand the enhancement of photon emission (contrast up to 45 %) at three different electron spin resonance frequencies. It will be shown that the defect contains a singlet ground-, and excited state, and a metastable spin 1 triplet state which act as a shelving state. The strong enhancement of photon emission by ESR can be attributed to the huge difference in the deshelving rates of each triplet states. It will be also shown that the coherent spin manipulation of the metastable triplet state is possible at room temperature. Even though the electron spin coherence time is limited by the life time of the triplet state (up to 2.5 µs), these findings suggest that the electron spin in this spin system can be used to read-out the coupled nuclear spin state because the nuclear spin can be protected during the initialization and storage processes thanks to the spin-less electron ground state.