High temperature spectroscopy of nitrogen vacancy centers in diamond

TL;DR

This study investigates how high temperatures affect the optical and spin properties of nitrogen-vacancy centers in diamond, revealing temperature-dependent shifts and decay behaviors relevant for quantum applications.

Contribution

It provides experimental data on high-temperature effects on NV centers, including radiative decay, spin resonance shifts, and phonon emission, with theoretical modeling of nonradiative decay barriers.

Findings

Radiative decay intensity decreases with temperature

ODMR resonance frequencies decrease as temperature rises

Phonon line emission shifts to higher wavelengths

Abstract

We study spectroscopy of negatively charged nitrogen-vacancy center in diamond at high temperatures under high vacuum conditions. Spin resonances are studied using optical detection of magnetic resonance (ODMR), and optical spectroscopy is employed to study radiative transitions. Upon increasing the temperature the intensity of radiative decay in visible and infra-red decreased. In addition, the ODMR resonance frequencies were decreased, and the phonon line emission shifted to higher wavelengths. Fitting the measured intensity of photo-luminescence with the theoretical predictions of the Mott-Seitz model yields the value of $0.24 \operatorname{eV}$ for the energy barrier associated with nonradiative decay.