Observation of suppressed terahertz absorption in photoexcited graphene
Name
Kong_Observation of.pdf
Size
326.63 KB
Format
Adobe PDF
Checksum (MD5)
3df9fbed59deeb0d519a0ddbbcc709a9
Author(s)
Frenzel, Alex James
Lui, Chun Hung
Fang, Wenjing
Nair, Nityan L.
Herring, Patrick Kenichi
Jarillo-Herrero, Pablo
Kong, Jing
Gedik, Nuh
Date Issued
March 2013
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Frenzel, A. J., C. H. Lui, W. Fang, N. L. Nair, P. K. Herring, P. Jarillo-Herrero, J. Kong, and N. Gedik. “Observation of Suppressed Terahertz Absorption in Photoexcited Graphene.” Appl. Phys. Lett. 102, no. 11 (2013): 113111.
Version
Author's final manuscript
Abstract
When light is absorbed by a semiconductor, photoexcited charge carriers enhance the absorption of far-infrared radiation due to intraband transitions. We observe the opposite behavior in monolayer graphene, a zero-gap semiconductor with linear dispersion. By using time domain terahertz (THz) spectroscopy in conjunction with optical pump excitation, we observe a reduced absorption of THz radiation in photoexcited graphene. The measured spectral shape of the differential optical conductivity exhibits non-Drude behavior. We discuss several possible mechanisms that contribute to the observed low-frequency non-equilibrium optical response of graphene.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/1.4795858
