Manipulation of the nuclear spin ensemble in a quantum dot with chirped magnetic resonance pulses

Munsch, Mathieu and Wüst, Gunter and Kuhlmann, Andreas V. and Xue, Fei and Ludwig, Arne and Reuter, Dirk and Wieck, Andreas D. and Poggio, Martino and Warburton, Richard J.. (2014) Manipulation of the nuclear spin ensemble in a quantum dot with chirped magnetic resonance pulses. Nature Nanotechnology, 9 (9). pp. 671-675.

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The nuclear spins in nanostructured semiconductors play a central role in quantum applications(1-4). The nuclear spins represent a useful resource for generating local magnetic(5) fields but nuclear spin noise represents a major source of dephasing for spin qubits(2,3). 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 shifts(6); and nanoscale NMR is hard to detect(7,8). 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanotechnologie Argovia (Poggio)
UniBasel Contributors:Poggio, Martino and Munsch, Mathieu and Wüst, Gunter Johannes and Kuhlmann, Andreas and Xue, Fei and Warburton, Richard J
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:03 Aug 2018 14:54
Deposited On:05 Dec 2014 09:45

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