Tunable excitons in bilayer graphene
Abstract
Excitons—bound pairs of electron and holes in solids—can be harnessed for optoelectronic applications. Being able to tune the exciton energy would bring functional flexibility to such devices. Although tunable excitons have been predicted to form in bilayer graphene, observing them experimentally has been difficult. Ju et al. used high-quality bilayer graphene samples sandwiched between layers of hexagonal boron nitride to observe excitons in this material. Exciton energy was tuned across a large range by controlling the gate voltages.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 17, 2017
- Source ID
- 10.1126/science.aam9175
Entities
People
- Farhan Rana
- Feng Wang
- James C. Hone
- Jiwoong Park
- Kenji Watanabe
- Lei Wang
- Long Ju
- Paul McEuen
- Steven G Louie
- Takashi Taniguchi
- Ting Cao
Organizations
- Air Force Office of Scientific Research
- Columbia University
- Cornell University
- Lawrence Berkeley National Laboratory
- National Institute for Materials Science
- University of California, Berkeley