Color center in diamond fundamental science and spectroscopy

Understanding the level structure and population dynamics, such as phonon-induced mixing and intersystem crossing, is important to bring color center in diamond into line with applications in quantum sensing and quantum information processing. For example, the intersystem crossing in nitrogen-vacancy centers enables initialization and read-out of electronic spin state, which is utilized in many applications. We are aiming to gain detailed understanding and develop microscopic models for color centers including the nitrogen-vacancy centers, the silicon-vacancy centers and the germanium-vacancy centers. We perform low-temperature, single-site spectroscopy and embed the results into theoretical models. The developed models can be used to enhance the performance of color center, for example, as quantum sensors.

Selected references:
S. Häußler, et al., „Photoluminescence excitation spectroscopy of SiV− and GeV− color center in diamond“. New Journal of Physics 19, 063036 (2017)

M. L. Goldman, et al., „ Phonon-Induced Population Dynamics and Intersystem Crossing in Nitrogen-Vacancy Centers”. Physical Review Letters 114,145502 (2015)

M. L. Goldman, et al., „State-selective intersystem crossing in nitrogen-vacancy centers“. Physical Review B 91, 165201 (2015)