Ph.D Thesis


Ph.D StudentMasis Sergei
SubjectDipolar Interactions between Dense Spin Ensembles in Diamond
DepartmentDepartment of Nanoscience and Nanotechnology
Supervisor ASSOCIATE PROF. Eyal Buks
Full Thesis textFull thesis text - English Version


Abstract

Continuous wave low temperature electron paramagnetic resonance experiments are performed on dense ensembles of optically polarizable spins in diamond, using Optically Detected Magnetic Resonance (ODMR). We demonstrate direct measurements of dipolar interactions between various ensembles: (a) in the same ensemble of negatively charged nitrogen-vacancy (NV-) centers we show for the first time in diamond a double Larmor-frequency absorption line, corresponding to two spins absorbing a single microwave photon; (b) for the first time to our best knowledge we directly measure an absorption line of a spin flip-flop between unlike spins. The spins belong to NV-ensembles with different symmetry axes; (c) we demonstrate a triple spin flip-flop between a single NV-and two substitutional nitrogen centers (P1). All the results above fill gaps in classic literature, and are attributed to the unique combination of high ensemble density, long coherence times, low temperature, high laser polarization and sensitive microwave to optical lock-in amplified measurement in our setup. The sharpness and high magnitude of (c) suggests applications in sensing. Additionally we report of a superconducting resonator design allowing strong coupling to spin ensemble undergoing high optical power polarization.