diamond_n_inter.m

Nitrogen interstitial spin system for diamond. Magnetic parameters from Felton et al., J. Phys. Condens. Matter 21, 364212 (2009), DOI link. The spin system contains one spin-1/2 electron and one nitrogen nucleus. The g-tensor and the nitrogen hyperfine tensor are built in a principal axis frame assembled from three direction vectors specified by their polar and azimuthal angles; the frame is orthogonalised by QR decomposition and forced to be right-handed. Both tensors of the WAR9 centre use that frame; for the WAR10 centre the hyperfine tensor uses a separate frame in which the first two axes are tilted to polar angles of 44.8 and 134.8 degrees. When '15N' is requested, the tabulated hyperfine tensor is used as it stands; when '14N' is requested, it is scaled by the ratio of the 14N and 15N magnetogyric ratios. Both tensors are then rotated by the matrix that aligns the requested crystal plane normal with the magnetic field direction, and returned in the zeeman.matrix and coupling.matrix fields.

Syntax

    [sys,inter]=diamond_n_inter(parameters)

Parameters

    parameters is a structure with the following fields:

      .centre       - 'war9' or 'war10'
      .orientation  - '111', '110', or '100' crystal plane normal
                      aligned with the magnetic field
      .nitrogen     - '14N' or '15N'

Outputs

    sys   - Spinach system specification structure

    inter - Spinach interaction specification structure

Notes

The principal values used are g=[2.00343 2.00272 2.00268] with a 15N hyperfine tensor of [8.30 7.85 8.17] MHz for the WAR9 centre, and g=[2.00344 2.00272 2.00269] with a 15N hyperfine tensor of [1.00 -1.01 0.00] MHz for the WAR10 centre.

See also

diamond_ni.m, diamond_nvm_gs.m, diamond_p1.m, diamond_vacancy.m, rotmat_align.m, Import,_export,_and_visualisation

Version 2.13, authors: Alexey Bogdanov