The nuclear spins in nanostructured semiconductors play a central role in quantum applications1,2,3,4. The nuclear spins represent a useful resource for generating local magnetic5 fields but nuclear spin noise represents a major source of dephasing for spin qubits2,3. Controlling the nuclear spins enhances the resource while suppressing the noise. NMR techniques are challenging: the group III and V isotopes have large spins with widely different gyromagnetic ratios; in strained material there are large atom-dependent quadrupole shifts6; and nanoscale NMR is hard to detect7,8. We report NMR on 100,000 nuclear spins of a quantum dot using chirped radiofrequency pulses. Following polarization, we demonstrate a reversal of the nuclear spin. We can flip the nuclear spin back and forth a hundred times. We demonstrate that chirped NMR is a powerful way of determining the chemical composition, the initial nuclear spin temperatures and quadrupole frequency distributions for all the main isotopes. The key observation is a plateau in the NMR signal as a function of sweep rate: we achieve inversion at the first quantum transition for all isotopes simultaneously. These experiments represent a generic technique for manipulating nanoscale inhomogeneous nuclear spin ensembles and open the way to probe the coherence of such mesoscopic systems.
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M.M., G.W., A.V.K., M.P. and R.J.W. acknowledge support from NCCR QSIT and EU ITN S3NANO; M.P. and F.X. from the SNI; and A.L., D.R. and A.D.W. from Mercur Pr-2013-0001 and BMBF-Q.com-H 16KIS0109. The authors thank P. Peddibhotla and C. Kloeffel for technical assistance and C. Degen, P. Maletinsky and H. Ribeiro for discussions.
The authors declare no competing financial interests.
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Munsch, M., Wüst, G., Kuhlmann, A. et al. Manipulation of the nuclear spin ensemble in a quantum dot with chirped magnetic resonance pulses. Nature Nanotech 9, 671–675 (2014). https://doi.org/10.1038/nnano.2014.175