Spin-Charge Separation in Finite Length Metallic Carbon Nanotubes
Type
ArticleKAUST Department
Computational Physics and Materials Science (CPMS)Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2017-10-17Online Publication Date
2017-10-17Print Publication Date
2017-11-08Permanent link to this record
http://hdl.handle.net/10754/626047
Metadata
Show full item recordAbstract
Using time-dependent density functional theory, we study the optical excitations in finite length carbon nanotubes. Evidence of spin-charge separation is given in the spacetime domain. We demonstrate that the charge density wave is due to collective excitations of electron singlets, while the accompanying spin density wave is due to those of electron triplets. The Tomonaga–Luttinger liquid parameter and density–density interaction are extrapolated from the first-principles excitation energies. We show that the density–density interaction increases with the length of the nanotube. The singlet and triplet excitation energies, on the other hand, decrease for increasing length of the nanotube. Their ratio is used to establish a first-principles approach for deriving the Tomonaga–Luttinger parameter (in excellent agreement with experimental data). Time evolution analysis of the charge and spin line densities evidences that the charge and spin density waves are elementary excitations of metallic carbon nanotubes. Their dynamics show no dependence on each other.Citation
Zhang Y, Zhang Q, Schwingenschlögl U (2017) Spin-Charge Separation in Finite Length Metallic Carbon Nanotubes. Nano Letters. Available: http://dx.doi.org/10.1021/acs.nanolett.7b02880.Sponsors
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). It was also supported by the National Natural Science Foundation of China (NSFC grant no. 11304015).Publisher
American Chemical Society (ACS)Journal
Nano LettersPubMed ID
29039674Additional Links
http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b02880ae974a485f413a2113503eed53cd6c53
10.1021/acs.nanolett.7b02880
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