TY - JOUR
T1 - Heteromoiré Engineering on Magnetic Bloch Transport in Twisted Graphene Superlattices
AU - Lin, Fanrong
AU - Qiao, Jiabin
AU - Huang, Junye
AU - Liu, Jiawei
AU - Fu, Deyi
AU - Mayorov, Alexander S.
AU - Chen, Hao
AU - Mukherjee, Paromita
AU - Qu, Tingyu
AU - Sow, Chorng Haur
AU - Watanabe, Kenji
AU - Taniguchi, Takashi
AU - Özyilmaz, Barbaros
N1 - Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/10/14
Y1 - 2020/10/14
N2 - Localized electrons subject to applied magnetic fields can restart to propagate freely through the lattice in delocalized magnetic Bloch states (MBSs) when the lattice periodicity is commensurate with the magnetic length. Twisted graphene superlattices with moiré wavelength tunability enable experimental access to the unique delocalization in a controllable fashion. Here, we report the observation and characterization of high-temperature Brown-Zak (BZ) oscillations which come in two types, 1/B and B periodicity, originating from the generation of integer and fractional MBSs, in the twisted bilayer and trilayer graphene superlattices, respectively. Coexisting periodic-in-1/B oscillations assigned to different moiré wavelengths are dramatically observed in small-angle twisted bilayer graphene, which may arise from angle-disorder-induced in-plane heteromoiré superlattices. Moreover, the vertical stacking of heteromoiré supercells in double-twisted trilayer graphene results in a mega-sized superlattice. The exotic superlattice contributes to the periodic-in-B oscillation and dominates the magnetic Bloch transport.
AB - Localized electrons subject to applied magnetic fields can restart to propagate freely through the lattice in delocalized magnetic Bloch states (MBSs) when the lattice periodicity is commensurate with the magnetic length. Twisted graphene superlattices with moiré wavelength tunability enable experimental access to the unique delocalization in a controllable fashion. Here, we report the observation and characterization of high-temperature Brown-Zak (BZ) oscillations which come in two types, 1/B and B periodicity, originating from the generation of integer and fractional MBSs, in the twisted bilayer and trilayer graphene superlattices, respectively. Coexisting periodic-in-1/B oscillations assigned to different moiré wavelengths are dramatically observed in small-angle twisted bilayer graphene, which may arise from angle-disorder-induced in-plane heteromoiré superlattices. Moreover, the vertical stacking of heteromoiré supercells in double-twisted trilayer graphene results in a mega-sized superlattice. The exotic superlattice contributes to the periodic-in-B oscillation and dominates the magnetic Bloch transport.
KW - Brown-Zak oscillations
KW - double twisted trilayer graphene
KW - heteromoiré superlattice
KW - magnetic Bloch states
KW - twisted bilayer graphene
UR - http://www.scopus.com/inward/record.url?scp=85092944551&partnerID=8YFLogxK
U2 - 10.1021/acs.nanolett.0c03062
DO - 10.1021/acs.nanolett.0c03062
M3 - Article
C2 - 32986443
AN - SCOPUS:85092944551
SN - 1530-6984
VL - 20
SP - 7572
EP - 7579
JO - Nano Letters
JF - Nano Letters
IS - 10
ER -