Moiréless correlations in ABCA graphene
Abstract
Micrometer-sized uniform four-layer (ABCA) rhombohedral graphene is realized by introducing a small twist angle between two bilayers of Bernal graphene. By means of scanning tunneling spectroscopy we observe an extremely sharp van Hove singularity of 3–5-meV half-width and a correlated many-body gap of 9.5 meV at neutrality, thus making small twisted double-bilayer graphene a unique platform to realize electronic correlations in the absence of a moiré potential. Furthermore, ABCA graphene domain walls display tunable topological edge states, of great interest in Floquet engineering.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 19, 2021
- Source ID
- 10.1073/pnas.2017366118
Entities
People
- Abhay N. Pasupathy
- Alexander Kerelsky
- Carmen Rubio-Verdú
- Cory Dean
- Dante M. Kennes
- Dmitri N. Basov
- Dorri Halbertal
- James C. Hone
- Kenji Watanabe
- Larry Song
- Lede Xian
- Lei Wang
- Nathan Finney
- Simon Turkel
- Takashi Taniguchi
- Ángel Rubio Secades
Organizations
- Columbia University
- Flatiron Institute
- Max Planck Institute for the Structure and Dynamics of Matter
- National Institute for Materials Science
- University of the Basque Country