期刊
PHYSICAL REVIEW B
卷 97, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.064101
关键词
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资金
- Australian Government
- Government of Western Australia
- Australian Postgraduate Award [ARC DP 150103317]
- Chinese NSF Grant [1167040630]
- [ARC DP 160101301]
Key properties of nine possible defect sites in hexagonal boron nitride (h-BN), V-N, V-N(-1), C-N, VNO2B, VNNB, VNCB, VBCN, VBCNSiN, and VNCBSiB, are predicted using density-functional theory and are corrected by applying results from high-level ab initio calculations. Observed h-BN electron-paramagnetic resonance signals at 22.4, 20.83, and 352.70 MHz are assigned to V-N, C-N, and VNO2B, respectively, while the observed photoemission at 1.95 eV is assigned to VNCB. Detailed consideration of the available excited states, allowed spin-orbit couplings, zero-field splitting, and optical transitions is made for the two related defects VNCB and VBCN. VNCB is proposed for realizing long-lived quantum memory in h-BN. VBCN is predicted to have a triplet ground state, implying that spin initialization by optical means is feasible and suitable optical excitations are identified, making this defect of interest for possible quantum-qubit operations.
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