Charged Topological Solitons in Zigzag Graphene Nanoribbons
arXiv:1705.07753 · doi:10.1088/2053-1583/aa9cd1
Abstract
Graphene nanoribbons with zigzag terminated edges have a magnetic ground state characterized by edge ferromagnetism and antiferromagnetic inter edge coupling. This broken symmetry state is degenerate in the spin orientation and we show that, associated with this degeneracy, the system has topological solitons. The solitons appear at the interface between degenerate ground states. These solitons are the relevant charge excitations in the system. When charge is added to the nanoribbon, the system energetically prefers to create magnetic domains and accommodate the extra electrons in the interface solitons rather than setting them in the conduction band.
arXiv comment5 pages, 4 figures
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- Probing local moments in nanographenes with electron tunneling spectroscopy
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