Topologically Protected Correlated End Spin Formation in Carbon Nanotubes

Cǎtǎlin Paşcu Moca, Wataru Izumida, Balázs Dóra, Örs Legeza, János K. Asbóth, Gergely Zaránd

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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
Article number056401
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 2020 Jul 31


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