Large spin-orbit coupling in carbon nanotubes

Steele, G. A. and Pei, Fei and Laird, E A and Jol, J M and Meerwaldt, H. B. and Kouwenhoven, L. P. (2013) Large spin-orbit coupling in carbon nanotubes. Nature Communications, 4. ISSN 2041-1723

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Abstract

It has recently been recognised that the strong spin-orbit interaction present in solids can lead to new phenomena, such as materials with non-trivial topological order. Although the atomic spin-orbit coupling in carbon is weak, the spin-orbit coupling in carbon nanotubes can be significant due to their curved surface. Previous works have reported spin-orbit couplings in reasonable agreement with theory, and this coupling strength has formed the basis of a large number of theoretical proposals. Here we report a spin-orbit coupling in three carbon nanotube devices that is an order of magnitude larger than previously measured. We find a zero-field spin splitting of up to 3.4 meV, corresponding to a built-in effective magnetic field of 29 T aligned along the nanotube axis. Although the origin of the large spin-orbit coupling is not explained by existing theories, its strength is promising for applications of the spin-orbit interaction in carbon nanotubes devices.

Item Type:
Journal Article
Journal or Publication Title:
Nature Communications
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
124380
Deposited By:
Deposited On:
04 Apr 2018 13:04
Refereed?:
Yes
Published?:
Published
Last Modified:
29 Oct 2020 06:19