Nonlocal Polarization Feedback in a Fractional Quantum Hall Ferromagnet

Hennel, Szymon and Braem, Beat A. and Baer, Stephan and Tiemann, Lars and Sohi, Pirouz and Wehrli, Dominik and Hofmann, Andrea and Reichl, Christian and Wegscheider, Werner and R`ossler, Clemens and Ihn, Thomas and Ensslin, Klaus and Rudner, Mark S. and Rosenow, Bernd. (2016) Nonlocal Polarization Feedback in a Fractional Quantum Hall Ferromagnet. Physical Review Letters, 116 (13). p. 136804.

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In a quantum Hall ferromagnet, the spin polarization of the two-dimensional electron system can be dynamically transferred to nuclear spins in its vicinity through the hyperfine interaction. The resulting nuclear field typically acts back locally, modifying the local electronic Zeeman energy. Here we report a nonlocal effect arising from the interplay between nuclear polarization and the spatial structure of electronic domains in a nu = 2/3 fractional quantum Hall state. In our experiments, we use a quantum point contact to locally control and probe the domain structure of different spin configurations emerging at the spin phase transition. Feedback between nuclear and electronic degrees of freedom gives rise to memristive behavior, where electronic transport through the quantum point contact depends on the history of current flow. We propose a model for this effect which suggests a novel route to studying edge states in fractional quantum Hall systems and may account for so-far unexplained oscillatory electronic-transport features observed in previous studies.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Quantum Computing with Semiconductors (Hofmann)
UniBasel Contributors:Hofmann, Andrea
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:25 Jan 2022 16:37
Deposited On:25 Jan 2022 16:37

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