Abstract
We study the spin and orbital dynamics of single nitrogen-vacancy (NV) centers in diamond between room temperature and 700 K. We find that the ability to optically address and coherently control single spins above room temperature is limited by nonradiative processes that quench the NV center's fluorescence-based spin readout between 550 and 700 K. Combined with electronic structure calculations, our measurements indicate that the energy difference between the 3E and 1A1 electronic states is approximately 0.8 eV. We also demonstrate that the inhomogeneous spin lifetime (T2*) is temperature independent up to at least 625 K, suggesting that single NV centers could be applied as nanoscale thermometers over a broad temperature range.
Highlights
The negatively charged nitrogen-vacancy (NV) center spin in diamond stands out among individually addressable qubit systems because it can be initialized, coherently controlled, and read out at room temperature [1]
We find that the ability to optically address and coherently control single spins above room temperature is limited by nonradiative processes that quench the NV center’s fluorescence-based spin readout between 550 and 700 K
The 3E intersystem crossing (ISC) is much stronger for the ms 1⁄4 Æ1 3E sublevels than for the ms 1⁄4 0 sublevel, which facilitates spin readout through the resulting spindependent photoluminescence (PL) and initializes the spin into the ms 1⁄4 0 3A2 sublevel with high probability
Summary
Lorentzian dips with normalized amplitude C are observed at the spin resonance frequencies (B $ 45 G). We observed Lorentzian dips in IPL with normalized amplitude C centered at the groundstate spin resonance frequencies [3]. We applied an approximately 45 G magnetic field along the defect’s symmetry axis to separate the ms 1⁄4 Æ1 states by approximately 250 MHz. We observed shifts in D on the order of 100 kHz=K due to lattice expansion, which is consistent with measurements performed at lower temperatures [29,30]. We applied a 555-nm picosecond laser pulse and measured the resulting PL with a time-correlated photon counting module We repeated this measurement for varying spin rotation angles and performed global. Mott-Seitz formula for nonradiative relaxation via multiphonon emission [31], ms1⁄40ðTÞ
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