期刊
ACS PHOTONICS
卷 5, 期 5, 页码 1967-1976出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b01442
关键词
color center; hexagonal boron nitride; group theory; ab initio
类别
资金
- EU DIADEMS Project
- DFG [CRC TRR21, FOR 1493]
- Hungarian National Research Development and Innovation Office (NKFIH) [2017-1.2.1-NKP-2017-00001]
- ERC Synergy grant BioQ
- EU EQUAM Project
We theoretically study physical properties of the most promising color center candidates for the recently observed single-photon emissions in hexagonal boron nitride (h-BN) monolayers. Through our group theory analysis combined with density functional theory (DFT) calculations we provide several pieces of evidence that the electronic properties of the color centers match the characters of the experimentally observed emitters. We calculate the symmetry-adapted multielectron wave functions of the defects using group theory methods and analyze the spin-orbit and spin-spin interactions in detail. We also identify the radiative and nonradiative transition channels for each color center. An advanced ab initio DFT method is then used to compute energy levels of the color centers and their zero-phonon-line (ZPL) emissions. The computed ZPLs, the profile of excitation and emission dipole polarizations, and the competing relaxation processes are discussed and matched with the observed emission lines. By providing evidence for the relation between single-photon emitters and local defects in h-BN, this work provides the first steps toward harnessing quantum dynamics of these color centers.
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