Negative terahertz conductivity in remotely doped graphene bilayer heterostructures
Abstract
Injection or optical generation of electrons and holes in graphene bilayers (GBLs) can result in the interband population inversion enabling the terahertz (THz) radiation lasing. The intraband radiative processes compete with the interband transitions. We demonstrate that remote doping enhances the indirect interband generation of photons in the proposed GBL heterostructures. Therefore, such remote doping helps to surpass the intraband (Drude) absorption, and results in large absolute values of the negative dynamic THz conductivity in a wide range of frequencies at elevated (including room) temperatures. The remotely doped GBL heterostructure THz lasers are expected to achieve higher THz gain compared with previously proposed GBL-based THz lasers.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 09, 2015
- Source ID
- 10.1063/1.4934856
Entities
People
- M. Ryzhii
- Michael Shur
- Taiichi Otsuji
- V. Ryzhii
- Vladimir Mitin
Organizations
- Bauman Moscow State Technical University
- Japan Society for the Promotion of Science
- Rensselaer Polytechnic Institute
- Tohoku University
- United States Air Force
- United States Army Research Laboratory
- University at Buffalo
- University of Aizu