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IQSE AMO/QO Physics Seminar

"Germanium-vacancy color center in diamond: The new color center for quantum optics and sensing applications"

Alexey Akimov
Texas A&M University


Color centers in diamond attract a lot of attention due to unique properties of diamond, such its optical and chemical purity, low concertation of nuclear spins in diamond matrix and its physical and chemical inertness. Nitrogen vacancy (NV) color centers in diamond is the most studied color center in diamond, which may be used for number applications in quantum information processing and sensing. Nevertheless, NV color center has number of disadvantages, such as broad emission spectrum dominated by phonons sideband and its high sensitivity to structural defects in diamond often introduced by surrounding nanostructures. This disadvantages stimulated search for other color centers. First, SiV center was suggested as such a new center. Due to high symmetry of this center, it does not have dipole moment in the ground state and therefore is not as sensitive to various surface defects as NV center. Moreover, it have narrow zero-phonon line dominating the spectrum. However, exited state decay of this center is dominated by non-radiative relaxation. The next natural candidate is GeV center since Ge is right under Si in the Mendeleev table. This center is yet not well studied, but may be very promising candidate for applications. In this talk, I will present our resent results on EIT in ensemble of GeV centers, perspective of using in with photonic crystal structures and thermometry with it.

Tuesday, October 3, 2017
IQSE Seminar Room, 12:00 Noon
(578 MPHY)

Institute for Quantum Science and Engineering
Texas A&M University

(Pizza, salad, and soda to be served at 11:30 am)