报告时间：7月11日上午10点

报告地点：近代物理系210会议室

报告人： 南开大学 苏循成教授

报告题目：OPTICALLY-PUMPED DYNAMIC NUCLEAR POLARIZATION OF 13C SPINS IN DIAMOND

报告摘要：A broad effort is underway to improve the sensitivity of nuclear magnetic resonance through the use of dynamic nuclear polarization. Nitrogen-vacancy (NV) centers in diamond offer an appealing platform because these paramagnetic defects can be optically polarized efficiently at room temperature. This presentation surveys alternative NV-based 13C spin polarization protocols, with emphasis on a recent scheme designed for powder geometries. Through experimental, analytical, and numerical work, we show that 13C spins polarize efficiently for virtually all orientations of the NV axis relative to the applied magnetic field and over a broad range of hyperfine couplings. We will also discuss the mechanics of the polarization of 13C spins in single crystals in the absence of microwave excitation, with attention to the interplay that emerges between spin cross-relaxation and mechanical rotation of the crystal as a whole.

报告人简介：Carlos Meriles obtained his Ph.D in physics at the Universidad Nacional de Córdoba, Argentina, under the supervision of Prof. A.H. Brunetti. After graduating in 2000, he joined the group of Prof. Alexander Pines at the University of California, Berkeley, and in 2004 he joined the department of physics at CUNY-City College of New York, where he is presently a professor. His research interests include nanoscale spin sensing and metrology, quantum spintronics, optically and electrically induced nuclear spin polarization, and spin-based quantum information processing.