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arXiv · 1208.5628

Phonon-induced dephasing of chromium colour centres in diamond

Tina Muller·Igor Aharonovich·Zhe Wang·Xin Yuan·Stefania Castelletto·Steven Prawer·Mete Atature
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Abstract

We report on the coherence properties of single photons from chromium-based colour centres in diamond. We use field-correlation and spectral lineshape measurements to reveal the interplay between slow spectral wandering and fast dephasing mechanisms as a function of temperature. We show that the zero-phonon transition frequency and its linewidth follow a power-law dependence on temperature indicating that the dominant fast dephasing mechanisms for these centres are direct electron-phonon coupling and phonon-modulated Coulomb coupling to nearby impurities. Further, the observed reduction in the quantum yield for photon emission as a function of temperature is consistent with the opening of additional nonradiative channels through thermal activation to higher energy states predominantly and indicates a near-unity quantum efficiency at 4 K.

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Tina Muller, Igor Aharonovich, Zhe Wang, Xin Yuan, Stefania Castelletto, Steven Prawer, Mete Atature. 2012-08-28. Phonon-induced dephasing of chromium colour centres in diamond. https://doi.org/10.1103/physrevb.86.195210

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