@article{ff87d6f00c7844788d0bea44c0e0428f,
title = "Topologically Protected Helical States in Minimally Twisted Bilayer Graphene",
abstract = "In minimally twisted bilayer graphene, a moir{\'e} 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 moir{\'e} 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.",
author = "Shengqiang Huang and Kyounghwan Kim and Efimkin, {Dmitry K.} and Timothy Lovorn and Takashi Taniguchi and Kenji Watanabe and Macdonald, {Allan H.} and Emanuel Tutuc and Leroy, {Brian J.}",
note = "Funding Information: The work at the University of Arizona was partially supported by the U.S. Army Research Laboratory and the U.S. Army Research Office under Contract Grant No. W911NF-14-1-0653 and the National Science Foundation under Grant No. EECS-1607911. The work at the University of Texas was supported by the National Science Foundation under Grant No. EECS-1610008 and by the Army Research Office under Grant No. W911NF-17-1-0312. K. W. and T. T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan and JSPS KAKENHI Grant No. JP15K21722. Publisher Copyright: {\textcopyright} 2018 American Physical Society.",
year = "2018",
month = jul,
day = "17",
doi = "10.1103/PhysRevLett.121.037702",
language = "English (US)",
volume = "121",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "3",
}