Radiofrequency response of the optically detected level anti-crossing signal in NV color centers in diamond in zero and weak magnetic fields

TL;DR

This study investigates how a quasi-resonant radio-frequency field affects the level anti-crossing signal in NV centers in diamond at zero and weak magnetic fields, revealing complex structures explained by Autler-Townes splitting.

Contribution

It demonstrates the RF field's influence on the anti-crossing signal structure and shows how to control its parameters in NV centers in diamond.

Findings

The complex response structure is explained by Autler-Townes splitting.

The slope of the central resonance can be increased by low-frequency magnetic modulation.

Conclusions about the nature of the anti-crossing effect in zero field are drawn.

Abstract

The response of the level anti-crossing signal to a quasi-resonant radio-frequency field, which appears in a zero magnetic field at NV color centers in diamond, is investigated. It is shown that the complex structure of this response can be explained by the Autler-Townes splitting. The possibility of controlling the parameters of the level anti-crossing signal is considered. It is shown that the slope of the central resonance recorded in this structure upon low-frequency modulation of the external magnetic field can be 2.3 times higher than the slope of the resonance recorded in the absence of an RF field. Conclusions are drawn about the nature of the level anti-crossing effect arising in zero field in NV color centers in diamond.