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KR: Fachgruppe Kristallographie

KR 13: Crystallography in Materials Science (KR jointly with DF, MI)

KR 13.7: Vortrag

Donnerstag, 3. April 2014, 17:00–17:15, CHE 184

Improving Nanomagnetometry Based on Nitrogen-Vacancy Centers by Coupling to Superparamagnetic Iron Oxide Nanoparticles — •Nikola Sadzak, Janik Wolters, Andreas W. Schell, Sten Wenzel, and Oliver Benson — Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, Berlin, Germany

The single negatively charged nitrogen-vacancy (NV) defect center in diamond is known to be a stable solid-state single photon source [1], with an electronic spin showing long coherence times even at room temperature. Furthermore, the optical readout of the spin state and its microwave-assisted manipulation allow this defect to be used either as a qubit register [2] or as a magnetic field sensor [3]. Here, we perform the coupling of individual NV centers in nanodiamond with single-domain superparamagnetic iron oxide nanoparticles. By showing huge magnetic susceptibilities and no hysteresis, the latter can be used as local microwave amplifiers, allowing the achievement of faster Rabi oscillations between the NV center electronic spin sublevels. Moreover, we investigate the effects on the NV- electronic spin dynamics and coherence times and discuss some applications in NV-based nanomagnetometry.

[1] I. Aharonovich et al., Rep. Prog. Phys. 74, 076501 (2011).

[2] L. Robledo et al., Nature 477, 574-578 (2011).

[3] J. R. Maze et al., Nature 455, 644-648 (2008).