Topologically Protected Correlated End Spin Formation in Carbon Nanotubes

Cătălin Paşcu Moca, Wataru Izumida, Balázs Dóra, O. Legeza, János K. Asbóth, G. Zaránd

Research output: Contribution to journalArticle


For most chiralities, semiconducting nanotubes display topologically protected end states of multiple degeneracies. We demonstrate using density matrix renormalization group based quantum chemistry tools that the presence of Coulomb interactions induces the formation of robust end spins. These are the close analogs of ferromagnetic edge states emerging in graphene nanoribbons. The interaction between the two ends is sensitive to the length of the nanotube, its dielectric constant, and the size of the end spins: for S=1/2 end spins, their interaction is antiferromagnetic, while for S>1/2, it changes from antiferromagnetic to ferromagnetic as the nanotube length increases. The interaction between end spins can be controlled by changing the dielectric constant of the environment, thereby providing a possible platform for two-spin quantum manipulations.

Original languageEnglish
Pages (from-to)56401
Number of pages1
JournalPhysical review letters
Issue number5
Publication statusPublished - Jul 31 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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