Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 66: Spintronics / Quantum Information: Vacancies in Diamond and SiC (jointly with HL)
TT 66.1: Talk
Friday, March 15, 2013, 09:30–09:45, H14
Optical detection of coherent electron spin states of vacancy defects in silicon carbide — •Sang-Yun Lee1, Helmut Fedder1, Torsten Rendler1, Matthias Widmann1, Nguyen Tien Son2, Erik Janzén2, and Jörg Wrachtrup1 — 1University of Stuttgart, Stuttgart, Germany — 2Department of Physic, Chemistry and Biology, Linköping University, Linköping, Sweden
The diamond has been known as a hosting material in which an existing single spin system can be addressed optically at room temperature. A recent study has revealed that the individually detectible spin state can also exist in silicon carbide (SiC) [1]. However, the recent experimental finding has been done only on a newly found unknown defect in SiC. Among the other well known defects in SiC, the silicon vacancy (VSi) can be another candidate because its coherent spin state has been successfully observed at room temperature with long life time by electron spin resonance [2], though the single spin detection is yet in question. While the conventional spin resonance method is suffered by the limited sensitivity, the optically detected magnetic resonance has been successfully used for the single spin detection. Thus the first step to elucidate whether this defect can be used as a room temperature solid state spin qubit, is to test the optical detection of its spin state at room temperature. We hereby report the optically detected spin coherence of the VSi spin ensemble at room temperature. Our efforts on single spin detection will be presented too.
[1] W. F. Koehl, et al., Nature 479, 84 (2011)
[2] V. A. Soltamov, et al., Physical Review Letters 108, 226402 (2012)