All-electron ab-initio hyperfine coupling of Si-, Ge- and Sn-vacancy defects in diamond

作     者：Karim, Akib Vallabhapurapu, Harish H. Adambukulam, Chris Laucht, Arne Russo, Salvy P. Peruzzo, Alberto 

作者机构：Quantum Photonics Laboratory Centre for Quantum Computation and Communication Technology School of Engineering RMIT University MelbourneVIC3000 Australia School of Electrical Engineering and Telecommunications University of New South Wales SydneyNSW2052 Australia ARC Centre of Excellence in Exciton Science School of Science RMIT University MelbourneVIC3001 Australia Chemical and Quantum Physics School of Science RMIT University MelbourneVIC3001 Australia Quantum Photonics Laboratory Centre for Quantum Computation and Communication Technology School of Engineering RMIT University MelbourneVIC3000 Australia 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2023年

核心收录：

主　　题：Atoms 

摘      要：Colour centres in diamond are attractive candidates for numerous quantum applications due to their good optical properties and long spin coherence times. They also provide access to the even longer coherence of hyperfine coupled nuclear spins in their environment. While the NV centre is well studied, both in experiment and theory, the hyperfine couplings in the more novel centres - SiV, GeV, and SnV - are still largely unknown. Here we report on the first all-electron ab-initio calculations of the hyperfine constants for SiV, GeV, and SnV defects in diamond, both for the respective defect atoms (29Si, 73Ge, 117Sn, 119Sn), as well as for the surrounding 13C atoms. Furthermore, we calculate the nuclear quadrupole moments of the GeV defect. We vary the Hartree-Fock mixing parameter for Perdew-Burke-Ernzerhof (PBE) exchange correlation functional and show that the hyperfine couplings of the defect atoms have a linear dependence on the mixing percentage. We calculate the inverse dielectric constant to predict an ab-initio mixing percentage. The final hyperfine coupling predictions are close to the experimental values available in the literature. Our results will help to guide future novel experiments on these defects. Copyright © 2023, The Authors. All rights reserved.