Tunable moiré bands and strong correlations in small-twist-angle bilayer graphene
Abstract
Accurately controlled, very long wavelength moiré patterns are realized in small-twist-angle bilayer graphene, and studied using electron transport and scanning probe microscopy. We observe gaps in electron transport at anomalous densities equal to ±8 electrons per moiré crystal unit cell, at variance with electronic structure theory, and the emergence of a Hofstadter butterfly in the energy spectrum in perpendicular magnetic fields. These findings open up an avenue to create artificial crystals by manipulating the relative angle between individual layers in a heterostructure.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 14, 2017
- Source ID
- 10.1073/pnas.1620140114
Entities
People
- Allan H. MacDonald
- Ashley Dasilva
- Babak Fallahazad
- Brian J LeRoy
- Emanuel Tutuc
- Kenji Watanabe
- Kyounghwan Kim
- Shengqiang Huang
- Stefano Larentis
- Takashi Taniguchi
Organizations
- Army Research Office
- National Institute for Materials Science
- National Science Foundation
- Samsung Group
- Semiconductor Research Corporation
- University of Arizona
- University of Texas at Austin