Physics CM Seminar | Title: From Optical Spectroscopy to Spin-Charge Interfaces in Diamond | Speaker: Dr. Carlos A. Meriles - City College of New York

Title: From Optical Spectroscopy to Spin-Charge Interfaces in Diamond

Speaker: Dr. Carlos A. Meriles - City College of New York

Host: Chunhui Du

Abstract: Color centers in diamond offer a versatile platform for quantum information processing, combining long-lived spin states with optical interfaces. While most efforts have focused on coherent spin manipulation and photon-mediated interactions, the ability to control and probe charge at the individual-defect level opens complementary opportunities for building scalable quantum architectures.

In this talk, I will discuss recent advances in the optical interrogation and charge-state manipulation of nitrogen-vacancy centers in diamond. I will first describe how resonant optical excitation enables reversible charge control and nondestructive readout with spatial resolution well below the diffraction limit. I will then show how correlated spectral fluctuations reveal the local electrostatic environment, allowing us to reconstruct the three-dimensional arrangement of neighboring defects. Finally, I will discuss experiments resolving individual carrier-capture events and their dependence on the surrounding charge environment.

Our results illustrate how optical spectroscopy can provide access to charge dynamics at the single-defect level, opening new possibilities for controlling interactions between solid-state quantum systems.

Short Bio: Carlos Meriles was born and raised in Córdoba , Argentina . He obtained his Ph.D in physics at FaMAF – the mathematics, physics and astronomy division of the Universidad Nacional de Córdoba – under the supervision of Prof. A.H. Brunetti. His doctoral studies focused on the use of Nuclear Quadrupole Resonance (NQR) to probe structural and dynamical disorder in organic crystals. After graduating in 2000, he joined the group of Prof. Alexander Pines at the University of California , Berkeley to work on Nuclear Magnetic Resonance (NMR), his present field of research. In 2004, he joined the Department of Physics at City College where he now teaches as a Professor.