| Coherence of single spins coupled to a nuclear spin bath of varying density (2008) | |||||||||
Abstract | |||||||||
| The dynamics of single electron and nuclear spins in a diamond lattice with different 13C nuclear spin concentration is investigated. Coherent control of up to three individual nuclei in a dense nuclear spin cluster is demonstrated. The free induction (FID) decays of nuclear spin Bell states and single nuclear coherences among 13C nuclear spins are compared and analyzed. Reduction of FID decay times T2* and dephasing times T2 upon increase of nuclear spin density has been found. For pure diamond, T2* as long as 30 microseconds and T2 of up to 0.65 ms for the electron spin has been observed. The 13C concentration dependence on T2* is explained by Fermi contact and dipolar interaction with nuclei in the lattice. It has been found that T2 decreases approximately as 1/n, where n is 13C concentration, as expected for electron spin dephasing dominated by dipolar interacting with a nuclear spin bath.. Comment: 4 pages, 4 figures, 1 movie (avi), 1 supplementary material (pdf) | |||||||||
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