"Ab initio theory of NV quantum bit in diamond” by Adam Gali (Wigner Research Centre for Physics)

Wednesday, March 14, 2018 - 4:00pm
Condensed Matter Physics Seminar

Nitrogen-vacancy center in diamond is a paramagnetic color center that can realize a quantum bit with millisecond coherence time of the electron spin at room temperature that makes it very attractive in quantum sensor and other quantum information processing applications. The readout and initialization of this quantum bit is based on its spin-selective fluorescence and very effective optical spinpolarization that have not yet been fully understood. We developed a theory to understand the full optical spinpolarization cycle with determining the coupling parameters and critical intersystem crossing rates by means of ab initio density functional theory calculations. Our new results complete the theory on the operation of NV center. If time allows then I present recent results on diamond surfaces by means of ab initio calculations that guide us about the requirements of surface termination for diamond nitrogen-vacancy sensor applications.

PAB 4-330