English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the photo-induced spin dynamics of single nitrogen-vacancy(NV) centres in diamond near the electronic ground state level anti-crossing(GSLAC), which occurs at an axial magnetic field around 1024 G. Using opticallydetected magnetic resonance spectroscopy, we first find that the electron spintransition frequency can be tuned down to 100 kHz for the \NV{14} centre, whilefor the \NV{15} centre the transition strength vanishes for frequencies belowabout 2 MHz owing to the GSLAC level structure. Using optical pulses to prepareand readout the spin state, we observe coherent spin oscillations at 1024 G forthe \NV{14}, which originate from spin mixing induced by residual transversemagnetic fields. This effect is responsible for limiting the smallestobservable transition frequency, which can span two orders of magnitude from100 kHz to tens of MHz depending on the local magnetic noise. A similar featureis observed for the \NV{15} centre at 1024 G. As an application of thesefindings, we demonstrate all-optical detection and spectroscopy ofexternally-generated fluctuating magnetic fields at frequencies from 8 MHz downto 500 kHz, using a \NV{14} centre. Since the Larmor frequency of most nuclearspin species lies within this frequency range near the GSLAC, these resultspave the way towards all-optical, nanoscale nuclear magnetic resonancespectroscopy, using longitudinal spin cross-relaxation.

Spin dynamics of diamond nitrogen-vacancy centres at the ground state level anti-crossing and all-optical low frequency magnetic field sensing