Color centers in diamond are point defects within the diamond host lattice that absorb and emit light at optical frequencies. Besides contributing to the striking visual characteristics of "fancy colored diamond" gemstones, the centers—particularly the negatively charged nitrogen-vacancy (NV) center and silicon-vacancy (SiV-) center—offer a number of possibilities for quantum computation and quantum information processing. In this talk, I will summarize recent work investigating the properties of negatively charged silicon-vacancy centers in diamond using the optical multidimensional coherent spectroscopy (MDCS). Finding suggest a strong influence of strain in determining the presence or absence of radiative coupling in the centers. By extension, the results reveal a new knob for tuning color-center-based photonic devices.
Christopher Smallwood is an assistant professor in the Department of Physics and Astronomy at San José State University (SJSU). He received an AB in Physics from Harvard College in 2005 where he conducted precision measurements of atomic rubidium vapor, and he received a PhD in Physics from UC Berkeley in 2014 where he developed techniques in time- and angle-resolved photoemission spectroscopy to study high-temperature superconductors. He spent two years as a postdoctoral research associate at JILA (University of Colorado and the National Institute of Standards and Technology) from 2014–2016 and two years as a postdoctoral research fellow in the Department of Physics at the University of Michigan from 2016–2018, where he specialized in using ultrafast spectroscopy techniques to study light-matter interactions in solid-state media. He is the recipient of a National Research Council postdoctoral Research Associateship award at NIST, and the 2013 Lars Commins Memorial Award in Experimental Physics at UC Berkeley.