3.8 Article

Spectral broadening and ultrafast dynamics of a nitrogen-vacancy center ensemble in diamond

Journal

MATERIALS FOR QUANTUM TECHNOLOGY
Volume 1, Issue 2, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/2633-4356/abf330

Keywords

multidimensional coherent spectroscopy; diamond NV centers; decoherence; non-Markovian

Funding

  1. We acknowledge N Manson and M Doherty for fruitful discussions. This work was supported by the Department of Energy grant number DE-SC0015782. D B A acknowledges support by a fellowship from the Brazilian National Council for Scientific and Technological D [DE-SC0015782]
  2. Department of Energy
  3. Brazilian National Council for Scientific and Technological Development (CNPq) [UL 474/1-1]
  4. DFG fellowship

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Multi-dimensional coherent spectroscopy was applied to study the NV center ensemble in diamond at cryogenic temperatures, revealing thermal dephasing and ultrafast spectral diffusion. The intrinsic, ensemble-averaged homogeneous linewidth was found to be in the tens of GHz range by extrapolating to zero temperature, and a temperature-dependent Stark splitting of the excited state manifold relevant to NV sensing protocols was observed.
Many applications of nitrogen-vacancy (NV) centers in diamond crucially rely on a spectrally narrow and stable optical zero-phonon line transition. Though many impressive proof-of-principle experiments have been demonstrated, much work remains in engineering NV centers with spectral properties that are sufficiently robust for practical implementation. To elucidate the mechanisms underlying their interactions with the environment, we apply multi-dimensional coherent spectroscopy to an NV center ensemble in bulk diamond at cryogenic temperatures. Our spectra reveal thermal dephasing due to quasi-localized vibrational modes as well as ultrafast spectral diffusion on the picosecond timescale. The intrinsic, ensemble-averaged homogeneous linewidth is found to be in the tens of GHz range by extrapolating to zero temperature. We also observe a temperature-dependent Stark splitting of the excited state manifold, relevant to NV sensing protocols.

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