Possible Evidence for Helical Nuclear Spin Order in GaAs Quantum Wires

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Possible Evidence for Helical Nuclear Spin Order in GaAs Quantum Wires

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Title: Possible Evidence for Helical Nuclear Spin Order in GaAs Quantum Wires
Author: Scheller, C. P.; Liu, T.-M.; Barak, G.; Yacoby, Amir; Pfeiffer, L. N.; West, K. W.; Zumbühl, D. M.

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Citation: Scheller, C. P., T.-M. Liu, G. Barak, A. Yacoby, L. N. Pfeiffer, K. W. West, and D. M. Zumbühl. 2014. “Possible Evidence for Helical Nuclear Spin Order in GaAs Quantum Wires.” Physical Review Letters 112 (6) (February). doi:10.1103/physrevlett.112.066801.
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Abstract: We present transport measurements of cleaved edge overgrowth GaAs quantum wires. The conductance of the first mode reaches 2e2/h at high temperatures T≳10  K, as expected. As T is lowered, the conductance is gradually reduced to 1e2/h, becoming T independent at T≲0.1  K, while the device cools far below 0.1  K. This behavior is seen in several wires, is independent of density, and not altered by moderate magnetic fields B. The conductance reduction by a factor of 2 suggests lifting of the electron spin degeneracy in the absence of B. Our results are consistent with theoretical predictions for helical nuclear magnetism in the Luttinger liquid regime.
Published Version: doi:10.1103/PhysRevLett.112.066801
Other Sources: http://arxiv.org/pdf/1306.1940v4.pdf
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:16380267
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