Graphene mediated Stark shifting of quantum dot energy levels
Abstract
We demonstrate an optoelectronic device comprised of single InAs quantum dots in an n-i-Schottky diode where graphene has been used as the Schottky contact. Deterministic electric field tuning is shown using Stark-shifted micro-photoluminescence from single quantum dots. The extracted dipole moments from the Stark shifts are comparable to conventional devices where the Schottky contact is a semi-transparent metal. Neutral and singly charged excitons are also observed in the well-known Coulomb-blockade plateaus. Our results indicate that graphene is a suitable replacement for metal contacts in quantum dot devices which require electric field control.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 23, 2016
- Source ID
- 10.1063/1.4952611
Entities
People
- A. Nick Vamivakas
- Antonio Badolato
- Chitraleema Chakraborty
- Kenneth M Goodfellow
- Laura Kinnischtzke
- Stefan Fält
- W. Wegscheider
- Yi-ming Lai
Organizations
- Air Force Office of Scientific Research
- ETH Zurich
- National Science Foundation
- Swiss National Science Foundation
- University of Rochester