Room-temperature manipulation and decoherence of a single spin in diamond

University of California, Santa Barbara, Santa Barbara, California, United States
Physical review. B, Condensed matter (Impact Factor: 3.66). 09/2006; 74(16). DOI: 10.1103/PhysRevB.74.161203
Source: arXiv


We report on room-temperature coherent manipulation of the spin of a single nitrogen-vacancy center in diamond and a study of its coherence as a function of magnetic field. We use magnetic resonance to induce Rabi nutations, and apply a Hahn spin echo to remove the effect of low-frequency dephasing. A sharp rise in the decoherence rate is observed at magnetic fields where the nitrogen-vacancy center spin couples resonantly to substitutional nitrogen spins via the magnetic dipolar coupling. Finally, we find evidence that away from these energy resonances spin flips of nitrogen electrons are the main source of decoherence.

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    • "Due to the energy match the optically induced spin polarization can not then be maintained in the presence of spins with reversed spin population. This cross relaxation including the involvement of changes of nuclear spin projection has been the subject of several studies [19] [20] [24] [25] [26] [27] [28]. Such a feature can be seen in the 0 • misalignment trace on Figure 1(a), and it clearly has structure. "
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    ABSTRACT: The emission intensity of diamond samples containing nitrogen-vacancy centres are measured as a function of magnetic field along a <111> direction for various temperatures. At low temperatures the responses are sample and stress dependent and can be modeled in terms of the previous understanding of the 3E excited state fine structure which is strain dependent. At room temperature the responses are largely sample and stress independent, and modeling involves invoking a strain independent excited state with a single zero field splitting of 1.42 GHz. The change in behaviour is attributed to a temperature dependent averaging process over the components of the excited state orbital doublet. It decouples orbit and spin and at high temperature the spin levels become independent of any orbit splitting. Thus the models can be reconciled and the parameters for low and high temperatures are shown to be consistent. Comment: 16 pages, 10 figures; fonts fixed and reference corrected
    New Journal of Physics 02/2009; 11(6). DOI:10.1088/1367-2630/11/6/063007 · 3.56 Impact Factor
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