How to Identify, Attribute, and Quantify Triplet Defects in Ensembles of Small Nanoparticles
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2020-08-11 |
| Journal | The Journal of Physical Chemistry Letters |
| Authors | Takuya F. Segawa, Alexander I. Shames |
| Institutions | ETH Zurich, Ben-Gurion University of the Negev |
| Citations | 11 |
Abstract
Section titled āAbstractāNanodiamonds containing negatively charged triplet (having an electron spin <i>S</i> = 1) nitrogen-vacancy (NV<sup>-</sup>) centers are an extraordinary room-temperature quantum system, whose electron spins may be polarized and read out optically even in a single nanocrystal. In this Viewpoint we promote a simple but reliable method to identify, attribute, and quantify these triplet defects in a polycrystalline sample using electron paramagnetic resonance (EPR) spectroscopy. The characterization relies on a specific āforbiddenā transition (āĪ<i>M</i><sub><i>S</i></sub> = 2ā), which appears at about half the central magnetic field and shows a remarkably small anisotropy. In particular, we emphasize that this method is by far not limited to NV<sup>-</sup> centers in diamond but could become an important characterization tool for novel triplet defects in various types of nanoparticles.