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Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 79: Poster: New Materials

HL 79.5: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-OG3

Robust optically pumped nuclear spin polarization — •Jochen Scheuer1, Ilai Schwartz2, Samuel Müller1, Qiong Chen2, Martin B Plenio2, Boris Naydenov1, and Fedor Jelezko11Institute of Quantum Optics, Ulm University, Ulm, Germany — 2Institute of Theoretical Physics, Ulm University, Ulm, Germany

Dynamical nuclear polarisation (DNP) can enhance the sensitivity of magnetic nuclear resonance imaging (MRI) by several orders of magnitude. Nanodiamonds are candidates for novel MRI tracers with particle sensitivity and long coherence times. There are several techniques which perform well for hyperpolarization in aligned magnetic fields, however, they are not applicable for randomly oriented nanodiamonds at ambient conditions. Here polarization and read out of a 13C nuclear spin bath is demonstrated by using a single nitrogen-vacancy (NV) center in a macroscopic diamond.

Our polarization methods use microwave dressed states and semi-adiabatic passages to transfer the NV’s electron spin polarization to the surrounding carbon nuclear spins, whereas the NV is repeatedly polarized optically.

We show that using integrated solid effect both for single and double quantum transitions a nuclear spin polarization can be achieved for broadened NV-ESR lines e.g. when the static magnetic field is not aligned along the NV’s crystal axis [1]. Our results can be applied for DNP in nanodiamonds, which would find a wide application in magnetic resonance imaging and could revolutionize the field.

[1] Chen, Q., et al., Phys Rev B 92.18 (2015): 184420.

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