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Strong magnetic coupling of an inhomogeneous NV ensemble to a cavity | | K. Sandner
; H. Ritsch
; R. Amsüss
; Ch. Koller
; T. Nöbauer
; S. Putz
; J. Schmiedmayer
; J. Majer
; | | Date: |
20 Dec 2011 | | Abstract: | We study experimentally and theoretically a dense ensemble of negatively
charged nitrogen-vacancy centers in diamond coupled to a high $Q$
superconducting coplanar waveguide cavity mode at low temperature. The
nitrogen-vacancy centers are modeled as effective spin one defects with
inhomogeneous frequency distribution. For a large enough ensemble the effective
magnetic coupling of the collective spin dominates the mode losses and
inhomogeneous broadening of the ensemble and the system exhibits well resolved
normal mode splitting in probe transmission spectra. We use several theoretical
approaches to model the probe spectra and the number and frequency distribution
of the spins. This analysis reveals an only slowly temperature dependent
q-Gaussian energy distribution of the defects with a yet unexplained decrease
of effectively coupled spins at very low temperatures below
$unit{100}{millikelvin}$. Based on the system parameters we predict the
possibility to implement an extremely stable maser by adding an external pump
to the system. | | Source: | arXiv, 1112.4767 | | Services: | Forum | Review | PDF | Favorites | |
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