Evidence for a fractional fractal quantum Hall effect in graphene superlattices
Abstract
Under the influence of an external magnetic field, the energies of electrons in two-dimensional systems group into the so-called Landau levels. In the cleanest samples, interactions among electrons lead to fractional quantum Hall (FQH) states. If such a system is then subjected to a superlattice potential, it is unclear whether the fragile FQH states will survive. To address this question, Wang et al. sandwiched graphene between two layers of hexagonal boron nitride. Transport measurements on the superlattice showed that some FQH states did survive. Furthermore, the interplay between interactions and the superlattice potential produced additional, anomalous states.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 04, 2015
- Source ID
- 10.1126/science.aad2102
Entities
People
- Bo Wen
- Cory. R. Dean
- James C. Hone
- Kenji Watanabe
- Lei Wang
- Mikito Koshino
- Takashi Taniguchi
- Yuanda Gao
- Zheng Han
Organizations
- Columbia University
- Cornell University
- Japan Society for the Promotion of Science
- National Institute for Materials Science
- National Science Foundation
- Office of Naval Research
- Tohoku University
- United States Department of Energy