NV-center spin magnetometry
Diamond defects convert magnetic fields into shifts of spin resonance frequencies.
$$H/\hbar=\gamma_e B_z S_z+D S_z^2/\hbar$$
Physical intuition
Diamond defects convert magnetic fields into shifts of spin resonance frequencies.
Deep dive: physical mechanism
Optically initialize and read out an NV electronic spin; microwave control probes Zeeman splitting, with optional Ramsey or echo sequences.
What is measured experimentally?
Optically detected magnetic resonance reveals field-dependent frequency splitting.
Assumptions, noise and limitations
Temperature and strain also shift transitions and can masquerade as magnetic signals.
Research and simulation exercise
Simulate ODMR lineshapes and fit field and temperature contributions.
Connect the ideas
Explore the chapter overview, learning path, and references.