Microscopic processes during ultra-fast laser generation of Frenkel defects in diamond

• URL: http://arxiv.org/abs/2105.11894v1
• Date: Tue, 25 May 2021 13:02:10 GMT
• Title: Microscopic processes during ultra-fast laser generation of Frenkel defects in diamond
• Authors: Benjamin Griffiths, Andrew Kirkpatrick, Shannon S. Nicley, Rajesh L. Patel, Joanna M. Zajac, Gavin W. Morley, Martin J. Booth, Patrick S. Salter, Jason M. Smith
• Abstract summary: Engineering single atomic defects into wide bandgap materials has become an attractive field in recent years. We present a study into the ultra-fast laser generation of vacancy-interstitial pairs (Frenkel defects) in diamond. We find that a model for Frenkel defect generation via the recombination of a bound biexciton as the electron plasma cools provides good agreement with experimental data.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Engineering single atomic defects into wide bandgap materials has become an attractive field in recent years due to emerging applications such as solid-state quantum bits and sensors. The simplest atomic-scale defect is the lattice vacancy which is often a constituent part of more complex defects such as the nitrogen-vacancy (NV) centre in diamond, therefore an understanding of the formation mechanisms and precision engineering of vacancies is desirable. We present a theoretical and experimental study into the ultra-fast laser generation of vacancy-interstitial pairs (Frenkel defects) in diamond. The process is described by a set of coupled rate equations of the pulsed laser interaction with the material and of the non-equilibrium dynamics of charge carriers during and in the wake of the pulse. We find that a model for Frenkel defect generation via the recombination of a bound biexciton as the electron plasma cools provides good agreement with experimental data, reproducing an effective non-linearity of $\sim$ 40 for Frenkel defect generation with respect to laser pulse energy.

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