Abstract
The characteristic transition of the centre at 637 nm is between and triplet states. There are also intermediate and singlet states, and the infrared transition at 1042 nm between these singlets is studied here using uniaxial stress. The stress shift and splitting parameters are determined, and the physical interaction giving rise to the parameters is considered within the accepted electronic model of the centre. It is established that this interaction for the infrared transition is due to a modification of electron–electron Coulomb repulsion interaction. This is in contrast to the visible 637 nm transition where shifts and splittings arise from modification to the one-electron Coulomb interaction. It is also established that a dynamic Jahn–Teller interaction is associated with the singlet state, which gives rise to a vibronic level 115 cm−1 above the electronic state. Arguments associated with this level are used to provide experimental confirmation that the is the upper singlet level and is the lower singlet level.
Highlights
The negatively charged nitrogen vacancy centre in diamond (NV−) [1] exhibits optically induced spin polarization
The principle zerophonon line (ZPL) associated with the centre is at 637 nm (1.945 eV, 15687 cm−1) and is found by uniaxial stress to involve a transition between a ground state of A symmetry and an excited state of E symmetry at a trigonal site [18]
Uniaxial stress measurements along 〈001〉 and 〈111〉 both the visible [18] and infrared [25] transitions involve an A ↔ E transition at a site of trigonal symmetry, NV−vis involves an A2 state whereas NV−IR involves an A1
Summary
The negatively charged nitrogen vacancy centre in diamond (NV−) [1] exhibits optically induced spin polarization. The principle zerophonon line (ZPL) associated with the centre is at 637 nm (1.945 eV, 15687 cm−1) and is found by uniaxial stress to involve a transition between a ground state of A symmetry and an excited state of E symmetry at a trigonal site [18]. We label this transition NV−vis since it is in the visible spectrum, and its fluorescence band is shown in figure 1. A weak emission band in the infrared (figure 1) with a ZPL at 1042 nm (1.19 eV, 9597 cm−1) is associated with decay between these two singlet levels [25]
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