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Single-molecule magnetic resonance spectroscopy and imaging is one of the ultimate goals in magnetic resonance and will has great applications in a broad range of scientific areas, from life science to physics and chemistry. To achieve this goal, the spin of a single nitrogen vacancy (NV) center in diamond is proposed as a highly sensitive magnetic-field sensor. Our research keeps on the line from one-dimension spectroscopy to two-dimension spectroscopy at single molecule scale. We and co-workers have successfully done a series of work on one-dimension spectroscopy [1-4]. However, measurement of the magnetic dipole-dipole couplings of a molecule is a missing key step from one-dimension to two-dimension magnetic resonance spectroscopy at nanoscale. Through correlation methods, we succeed to detect the intra-molecule magnetic dipole interaction of (5 nanometer)3 volume samples. In the future, magnetic coupling of a single molecule could be achieved if the coherence property of shallow NV sensor is improved [5].
References:
[1] Fazhan Shi, Qi Zhang, Pengfei Wang, Hongbin Sun, Jiarong Wang, Xing Rong, Ming Chen, Chenyong Ju, Friedemann Reinhard, Hongwei Chen, Joerg Wrachtrup, Junfeng Wang, and Jiangfeng Du. Single-protein spin resonance spectroscopy under ambient conditions, Science, 347, 1135 (2015)
[2] C. Mueller, X. Kong, J. M. Cai, K. Melentijevic, A. Stacey, M. Markham, J. Isoya, S. Pezzagna, J. Meijer, J. F. Du, M. B. Plenio, B. Naydenov, L. P. McGuinness, and F. Jelezko. Nuclear magnetic resonance with single spin sensitivity. Nature Communications, 5:4703 (2014)
[3] Tobias Staudacher, Fazhan Shi, S. Pezzagna, Jan Meijer, Jiangfeng Du, Carlos A. Meriles, Friedemann Reinhard, Joerg Wrachtrup. Nuclear magnetic resonance spectroscopy on a (5nm)3 volume of liquid and solid samples, Science, 339, 561 (2013)
[4] Fazhan Shi, Qi Zhang, Boris Naydenov, Fedor Jelezko, Jiangfeng Du, Friedemann Reinhard, and Joerg Wrachtrup. Quantum logic readout and cooling of a single dark electron spin, Phys. Rev. B, 87, 195414 (2013)
[5] Fazhan Shi, Xi Kong, Pengfei Wang, Fei Kong, Nan Zhao, Renbao Liu, and Jiangfeng Du. Sensing and atomic-scale structure analysis of single nuclear spin clusters in diamond, Nature Physics, 10, 21 (2014)
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