New infrared emission of the NV centre in diamond: Zeeman and uniaxial stress studies

TL;DR

This paper identifies an infrared emission band in the NV center of diamond linked to a transition between singlet levels, with potential implications for quantum information processing.

Contribution

It reports the discovery of a new infrared emission associated with the NV center and elucidates its origin through stress and magnetic field studies.

Findings

Infrared emission band at 1046 nm linked to NV center

Transition occurs between 1E and 1A1 singlet levels

Infrared emission offers new avenues for quantum applications

Abstract

An emission band in the infrared is shown to be associated with a transition within the negative nitrogen-vacancy center in diamond. The band has a zero-phonon line at 1046 nm, and uniaxial stress and magnetic field measurements indicate that the emission is associated with a transition between 1E and 1A1 singlet levels. Inter-system crossing to these singlets causes the spin polarisation that makes the NV- centre attractive for quantum information processing, and the infrared emission band provides a new avenue for using the centre in such applications.