Anticrossing Spin Dynamics of Diamond Nitrogen-Vacancy Centers and All-Optical Low-Frequency Magnetometry

Abstract

We investigate the photoinduced spin dynamics of single nitrogen-vacancy (N-V) centers in diamond near the electronic ground-state level anticrossing (GSLAC), which occurs at an axial magnetic field around 1024 G. Using optically detected magnetic resonance spectroscopy, we first find that the electron-spin transition frequency can be tuned down to 100 kHz for the N14-V center, while, for the N15-V center, the transition strength vanishes for frequencies below about 2 MHz owing to the GSLAC structure. Using optical pulses to prepare and read out the spin state, we observe coherent spin oscillations at 1024 G for the N14-V center which originate from spin mixing induced by residual transverse..