Quantum Sensors in Diamond for Nano- and Microscale Magnetic Resonance Applications

TH Department Seminar
Datum: 16.05.2024
Uhrzeit: 11:00
Vortragende(r): Prof. Dominik Bucher
TUM School of Natural Sciences, Technische Universität München, Garching, Germany
Ort: https://zoom.us/j/99512086991?pwd=UE03TkprcitLQjdMRk5ZdVp0c0RQQT09
Raum: Meeting ID: 912 7296 6563 | Passcode: 057467
Gastgeber: TH Department

Nitrogen vacancy (NV) point defects in diamond have emerged as a promising platform for quantum sensing. The electronic spin state of these solid-state qubits can be optically polarised, coherently manipulated with microwave pulses, and read out via their spin-state-dependent photoluminescence. Using this optically detected magnetic resonance method, magnetic signals from a single molecules or spins can be detected [1].

In the first part of the talk, I will introduce NV-NMR spectroscopy for probing surfaces and interfaces. This new technique allows us to detect and quantify (sub)monolayers of self-assembled molecules on an alumina oxide surface and their formation in real time under chemically relevant conditions [2]. Secondly, I will briefly present our recent results on the use of NV centers to perform optical wide-field NMR microscopy with a camera. This technique allows magnetic resonance imaging (MRI) in real space on microscopic length scales [3, 4]. These novel approaches have the potential to extend current NMR capabilities to probe single cells in biology and interfaces or thin film materials in energy or catalysis research.

[1] D.R. Allert, K.D. Briegel, D.B. Bucher, Advances in nano- and microscale NMR spectroscopy using diamond quantum sensors. Chemical Communications, 58, 8165 - 8181 (2022)

[2] K. Liu, A. Henning, M.W. Heindl, R.D. Allert, J.D. Bartl, I.D. Sharp, R. Rizzato, D.B. Bucher, Surface NMR using quantum sensors in diamond, PNAS, 119, (5) e2111607119 (2022)

[3] F. Bruckmaier, D.R. Allert, N. Neuling, P. Amrein, S. Littin, K.D. Briegel, P. Schätzle, P. Knittel, M. Zaitsev, D.B. Bucher, Imaging local diffusion in microstructures using NV-based pulsed field gradient NMR. Science Advances, 9, 33 (2023)

[4] K. D. Briegel, N. R. von Grafenstein, J. C. Drager, P. Blümler, R. D. Allert, D. B. Bucher, Optical Widefield Nuclear Magnetic Resonance Microscopy. arxiv.org/abs/2402.18239 (2024)