Speaker: Anton Pershin (SZFI)
Title: Unveiling the Intricate Relationship between the Environment and the Properties of Defect Qubits and Organic Emitters
Date: Tuesday, 27 June 2023, 10:00
Place: KFKI Campus, Bldg. 1, 2nd floor, Conference Room
Abstract:
Environmental control provides a great opportunity to tailor the properties of defect qubits and molecular emitters. In this talk, my aim is to illustrate the importance of considering the environment in which materials are embedded when designing functional devices for quantum sensing and optoelectronics. Firstly, the impact of surface and interfacial band bending on the coherence time of nitrogen-vacancy (NV) centers in diamond will be discussed. It will be shown that modifying the surface properties can alter the stability of the defect along with the magnetic and electric noises inside the diamond. This allows for new applications of the NV center in quantum sensing, such as operation at ultra-low temperature [1], detection of diamagnetic electrolytes [2], and sensing distant nuclear spins. Secondly, the effect of the environment on the efficiency of organic light-emitting diodes will be emphasized [3]. Finally, the focus will be on the molecules and defects where the standard density functional theory calculations fail to accurately capture the excited state properties [4]. Instead, an approach to calculate the excitation energies with high-accuracy post-Hartree-Fock methods in these extended systems will be presented.
[1] Neethirajan et al. Nano Lett. 2023, 23, 7, 2563–2569
[2] Freire-Moschovitis et al. ACS Nano 2023, 17, 11, 10474–10485
[3] Gillett et al. Nature Materials, 2022, 21
[4] Pershin et al. Nature Communications, 2019, 10 (1), 597
