Ultrafast terahertz Faraday rotation in graphene
Abstract
Terahertz (THz) Faraday rotation measurements were performed to investigate carrier dynamics in p-type Chemical vapor deposition (CVD) graphene. We used static and time-resolved polarization-sensitive THz transmission measurements in a magnetic field to probe free carriers in GaAs, InP, and Graphene. Static measurements probe the equilibrium carrier density and momentum scattering rate. Time-resolved (optical pump/THz probe) measurements probe the change in these quantities following photoexcitation. In a typical CVD graphene sample, we found that 0.5 ps following photoexcitation with 1 × 1013 photons/cm2 pulses at 800 nm the effective hole scattering time decreased from 37 fs to 34.5 fs, while the carrier concentration increased from 2.0 × 1012 cm−2 to 2.04 × 1012 cm−2, leading to a transient decrease in the conductivity of the film.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 01, 2014
- Source ID
- 10.1063/1.4903212
Entities
People
- B. A. Alebachew
- J. T. Robinson
- James Heyman
- M. D. Nguyen
- R. F. Foo Kune
Organizations
- Macalester College
- National Science Foundation
- Office of Naval Research
- United States Naval Research Laboratory