All-Optical and Microwave-Free Detection of Meissner Screening using Nitrogen-Vacancy Centers in Diamond

• URL: http://arxiv.org/abs/2101.04571v1
• Date: Tue, 12 Jan 2021 16:03:58 GMT
• Title: All-Optical and Microwave-Free Detection of Meissner Screening using Nitrogen-Vacancy Centers in Diamond
• Authors: D. Paone, D. Pinto, G. Kim, L. Feng, M-J. Kim, R. St\"ohr, A. Singha, S. Kaiser, G. Logvenov, B. Keimer, J. Wrachtrup and K. Kern
• Abstract summary: We present an all-optical, microwave-free method that utilizes the negatively charged nitrogen-vacancy center in diamond as a non-invasive quantum sensor. The strong B-field dependence of the NV photoluminescence allows us to investigate the Meissner screening in LSCO under an externally applied magnetic field in a non-resonant manner.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Microscopic studies on thin film superconductors play an important role for probing non-equilibrium phase transitions and revealing dynamics at the nanoscale. However, magnetic sensors with nanometer scale spatial and picosecond temporal resolution are essential for exploring these. Here, we present an all-optical, microwave-free method, that utilizes the negatively charged nitrogen-vacancy (NV) center in diamond as a non-invasive quantum sensor and enables the spatial detection of the Meissner state in a superconducting thin film. We place an NV implanted diamond membrane on a superconducting LSCO thin film. The strong B-field dependence of the NV photoluminescence (PL) allows us to investigate the Meissner screening in LSCO under an externally applied magnetic field in a non-resonant manner.

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