Topologically Protected Helical States in Minimally Twisted Bilayer Graphene
Efimkin, Dmitry K.
MacDonald, Allan H.
LeRoy, Brian J.
AffiliationUniv Arizona, Phys Dept
MetadataShow full item record
PublisherAMER PHYSICAL SOC
CitationHuang, S., Kim, K., Efimkin, D. K., Lovorn, T., Taniguchi, T., Watanabe, K., ... & LeRoy, B. J. (2018). Topologically Protected Helical States in Minimally Twisted Bilayer Graphene. Physical review letters, 121(3), 037702. DOI:https://doi.org/10.1103/PhysRevLett.121.037702
JournalPHYSICAL REVIEW LETTERS
Rights© 2018 American Physical Society.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractIn minimally twisted bilayer graphene, a moire pattern consisting of AB and BA stacking regions separated by domain walls forms. These domain walls are predicted to support counterpropogating topologically protected helical (TPH) edge states when the AB and BA regions are gapped. We fabricate designer moire crystals with wavelengths longer than 50 nm and demonstrate the emergence of TPH states on the domain wall network by scanning tunneling spectroscopy measurements. We observe a double-line profile of the TPH states on the domain walls, only occurring when the AB and BA regions are gapped. Our results demonstrate a practical and flexible method for TPH state network construction.
VersionFinal published version
SponsorsU.S. Army Research Laboratory; U.S. Army Research Office [W911NF-14-1-0653]; National Science Foundation [EECS-1607911, EECS-1610008]; Army Research Office [W911NF-17-1-0312]; MEXT, Japan; JSPS KAKENHI [JP15K21722]