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AMO/QO Pizza Seminar


"Precision Thermometry in a Living Cell Using Nitrogen-Vacancy Centers in Diamond"


Dr. Mohammadreza Rezaee
Texas A&M University

ABSTRACT 

A nitrogen atom substituted in a place of a carbon next to a vacant lattice point inside diamond structure forms a highly-stable single photon source with possible applications in quantum optics, quantum information processing and cryptography (promising solid-state qubit), precision magnetic field sensing, bio-imaging and thermometry. Nitrogen-Vacancy color center is essentially a point defect which happens naturally in CVD grown diamond lattice and can exist as neutral NV􀬴 or in the negative electronic state as NV􀬿. The spin triplet ground sate of this structure; which can be initialized and read out by laser through spin-state dependent fluorescence; is split because of the spin-spin interactions (zero-field splitting). We can also further remove the degeneracy by applying external field such as microwave radiation. The temperature dependence of the exact value of the transition frequency between the spin states can be utilized as a highly accurate probe to measure the temperature of the environment these nanodiamonds are placed in. Since nanodiamonds are inert, they can be embedded inside a living cell and this technique can be applied to measure the temperature variation in bio applications. Detection of temperature change in ~2 mK range has been successfully achieved using this method. Beside the NV centers, germanium-vacancy centers (GeV) and siliconvacancy centers (SiV) are the promising future and the fast-growing research areas in this field.


Monday, June 27, 2016
IQSE 578, 12:30 Noon
Mitchell Physics Building


Institute for Quantum Science and Engineering
Texas A&M University

(Pizza, salad, and soda to be served at 12:00 noon)