Single and double quantum transitions in spin-mixed states under photo-excitation

• URL: http://arxiv.org/abs/2306.17531v1
• Date: Fri, 30 Jun 2023 10:42:54 GMT
• Title: Single and double quantum transitions in spin-mixed states under photo-excitation
• Authors: Anand Patel (1 and 2), Zainab Chowdhry (1 and 3), Anil Prabhakar (2), A. Rathi (1 and 3) and V.P. Bhallamudi (1, 2 and 3) ((1) Quantum Center of Excellence in Diamond and Emergent Materials, Indian Institute of Technology Madras, Chennai 600036, India, (2) Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India, (3) Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India)
• Abstract summary: Electronic spins associated with the Nitrogen-Vacancy (NV) center in diamond offer an opportunity to study spin-related phenomena. We study both single- and double-quantum transitions (SQT and DQT) in NV centers between spin-mixed states. Such detailed understanding of spin-mixed states in NV centers under photo-excitation can help greatly in realizing NV-diamond platform's potential.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Electronic spins associated with the Nitrogen-Vacancy (NV) center in diamond offer an opportunity to study spin-related phenomena with extremely high sensitivity owing to their high degree of optical polarization. Here, we study both single- and double-quantum transitions (SQT and DQT) in NV centers between spin-mixed states, which arise from magnetic fields that are non-collinear to the NV axis. We demonstrate the amplification of the ESR signal from both these types of transition under laser illumination. We obtain hyperfine-resolved X-band ESR signal as a function of both excitation laser power and misalignment of static magnetic field with the NV axis. This combined with our analysis using a seven-level model that incorporates thermal polarization and double quantum relaxation allows us to comprehensively analyze the polarization of NV spins under off-axis fields. Such detailed understanding of spin-mixed states in NV centers under photo-excitation can help greatly in realizing NV-diamond platform's potential in sensing correlated magnets and biological samples, as well as other emerging applications, such as masing and nuclear hyperpolarization.

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