Electron–Nuclear Interaction in $$^{13}C$$ Nanotube Double Quantum Dots

 Title: Electron–Nuclear Interaction in $$^{13}C$$ Nanotube Double Quantum Dots Author: Churchill, Hugh Olen Hill; Bestwick, Andrew J.; Harlow, Jennifer W.; Kuemmeth, Ferdinand; Marcos, David; Stwertka, Carolyn H.; Watson, Susan K.; Marcus, Charles Masamed Note: Order does not necessarily reflect citation order of authors. Citation: Churchill, Hugh Olen Hill, Andrew J. Bestwick, Jennifer W. Harlow, Ferdinand Kuemmeth, David Marcos, Carolyn H. Stwertka, Susan K. Watson, and Charles Masamed Marcus. 2009. Electron-nuclear interaction in 13C nanotube double quantum dots. Nature Physics 5(5): 321-326. Full Text & Related Files: Churchill_Electronnuclear_Interaction.pdf (2.519Mb; PDF) Abstract: For coherent electron spins, hyperfine coupling to nuclei in the host material can either be a dominant source of unwanted spin decoherence or, if controlled effectively, a resource enabling storage and retrieval of quantum information. To investigate the effect of a controllable nuclear environment on the evolution of confined electron spins, we have fabricated and measured gate-defined double quantum dots with integrated charge sensors made from single-walled carbon nanotubes with a variable concentration of $$^{13}C$$ (nuclear spin $$(I=\frac{1}{2})$$ among the majority zero-nuclear-spin $$^{12}C$$ atoms. We observe strong isotope effects in spin-blockaded transport, and from the magnetic field dependence estimate the hyperfine coupling in $$^{13}C$$ nanotubes to be of the order of $$100 \mu eV$$, two orders of magnitude larger than anticipated. $$^{13}C$$-enhanced nanotubes are an interesting system for spin-based quantum information processing and memory: the $$^{13}C$$ nuclei differ from those in the substrate, are naturally confined to one dimension, lack quadrupolar coupling and have a readily controllable concentration from less than one to $$10^5$$ per electron. Published Version: doi:10.1038/nphys1247 Other Sources: http://arxiv.org/abs/0811.3236v2 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:5110752 Downloads of this work:

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