Possible Evidence for Helical Nuclear Spin Order in GaAs Quantum Wires

Scheller, C. P. and Liu, T. -M. and Barak, G. and Yacoby, A. and Pfeiffer, L. N. and West, K. W. and Zumbühl, D. M.. (2014) Possible Evidence for Helical Nuclear Spin Order in GaAs Quantum Wires. Physical review letters, Vol. 112, H. 6 , 066801.

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Official URL: http://edoc.unibas.ch/dok/A6223314

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We present transport measurements of cleaved edge overgrowth GaAs quantum wires. The conductance of the first mode reaches 2 e^2/h at high temperatures T < 10 K, as expected. As T is lowered, the conductance is gradually reduced to 1 e^2/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 two suggests lifting of the electron spin degeneracy in absence of B. Our results are consistent with theoretical predictions for helical nuclear magnetism in the Luttinger liquid regime.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
UniBasel Contributors:Zumbühl, Dominik M
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:06 Feb 2015 09:58
Deposited On:06 Feb 2015 09:58

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