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New disordered anyon phase of doped graphene zigzag nanoribbonopen access

Authors
Kim, Young HeonLee, Hye JeongLee, Hyun-YongYang, S-R Eric
Issue Date
25-8월-2022
Publisher
NATURE PORTFOLIO
Citation
SCIENTIFIC REPORTS, v.12, no.1
Indexed
SCIE
SCOPUS
Journal Title
SCIENTIFIC REPORTS
Volume
12
Number
1
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/145833
DOI
10.1038/s41598-022-18731-6
ISSN
2045-2322
Abstract
We investigate interacting disordered zigzag nanoribbons at low doping, using the Hubbard model to treat electron interactions within the density matrix renormalization group and Hartree-Fock method. Extra electrons that are inserted into an interacting disordered zigzag nanoribbon divide into anyons. Furthermore, the fractional charges form a new disordered anyon phase with a highly distorted edge spin density wave, containing numerous localized magnetic moments residing on the zigzag edges, thereby displaying spin-charge separation and a strong non-local correlation between the opposite zigzag edges. We make the following new predictions, which can be experimentally tested: (1) In the low doping case and weak disorder regime, the soft gap in the tunneling density of states is replaced by a sharp peak at the midgap energy with two accompanying peaks. The e(-) /2 fractional charges that reside on the boundary of the zigzag edges are responsible for these peaks. (2) We find that the midgap peak disappears as the doping concentration increases. The presence of e(-) / 2 fractional charges will be strongly supported by the detection of these peaks. Doped zigzag ribbons may also exhibit unusual transport, magnetic, and inter-edge tunneling properties.
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