ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarCsóré AndrásDepartment of Atomic Physics, BMEKramers doublet 
transition metal point defects in hexagonal silicon carbide for quantum 
technology applicationsTuesday, 17 November 2020, 10:00, video conference, 
https://letsmeet.wigner.hu/szeminariumTransition metal (TM) point defects in 
silicon carbide (SiC) have attracted special attention recently owing to 
their highly promising properties with respect to quantum technology 
applications. The paramagnetic electronic structure of these defects exhibits 
a rich set of interesting and not yet fully resolved physics. In particular, 
the character of wavefunctions and the corresponding strong electron-phonon 
coupling may highly influence their interaction with an external magnetic 
field. The complex interplay between the electronic orbitals, phonons and 
electron spin determines the effective pseudospin of the system that I 
demonstrate on vanadium and molybdenum defects in hexagonal silicon carbide 
(SiC) by means of ab initio calculations [1]. Furthermore, I show that this 
interaction leads to the experimentally already observed giant anisotropy in 
the g-tensor of the TM defects with Kramers doublet spin ground state, 
resulting in reduced and vanishing interaction with the magnetic field in 
parallel and transverse directions, respectively [1].References:[1] A. Csóré, 
A. Gali, arXiv:1909.11587v2 [quant-ph] Minden érdeklődőt szívesen 
látunk! - Everyone is welcome to attend.Róbert Juhászsem-admin AT szfki.hu