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QI: Fachverband Quanteninformation
QI 32: Quantum Sensing and Metrology
QI 32.13: Vortrag
Freitag, 22. März 2024, 13:00–13:15, HFT-FT 131
Wavelength Dependence of the Electrical and Optical Readout of NV Centers in Diamond — •Lina Maria Todenhagen1,2 and Martin S. Brandt1,2 — 1Walter Schottky Institut, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany — 2Physik-Department, School of Natural Sciences, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
The nitrogen-vacancy (NV) center in diamond is one of the most attractive quantum systems used in practical applications, especially for quantum sensing. However, the miniaturization and integration of NV-based quantum technology is still challenging, as the conventional optical spin readout (optically detected magnetic resonance, ODMR) requires an extensive optical setup and is often limited by the inefficient outcoupling of photons. Alternatively, we can read out the spin state purely electrically by generating a spin-dependent photocurrent (electrically detected magnetic resonance, EDMR). To maximize the achievable spin contrast in both readout techniques, we investigate the influence of different optical excitation wavelengths and identify different spectral regimes that drive different excitation processes in both stable charge states of the NV center, NV0 and NV−. While ODMR works efficiently between 480 and 580 nm, we find that EDMR shows an additional strong dependence on the excitation dynamics, and is significantly enhanced by resonantly exciting the zero-phonon line of the NV neutral charge state.
Keywords: NV Center; Quantum Sensing; Electrical Readout; Excitation Wavelength; Photocurrent