Abstract
We have studied the Stark effect involving the spin transition in the 3A ground state of the N-V defect center in type Ib diamond, using techniques for optical detection of spin echoes. Electric-field-induced modulations of the Hahn-echo decays are reported. The results are characteristic of a linear Stark effect, which proves that the defect lacks inversion symmetry. The spin-Hamiltonian parameters characterizing the linear Stark effect of the N-V center triplet state are R 3D=0.35±0.02 Hz cm/V and R 2E=17±2.5 Hz cm/V.
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