Premium
Ultrafast Processes in Graphene: From Fundamental Manybody Interactions to Device Applications
Author(s) -
Winnerl Stephan,
Mittendorff Martin,
KönigOtto Jacob C.,
Schneider Harald,
Helm Manfred,
Winzer Torben,
Knorr Andreas,
Malic Ermin
Publication year - 2017
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201700022
Subject(s) - physics , graphene , phonon , photon , electron , terahertz radiation , photon energy , atomic physics , scattering , ultrashort pulse , condensed matter physics , optoelectronics , optics , nuclear physics , quantum mechanics , laser
A joint experiment‐theory investigation of the carrier dynamics in graphene, in particular in the energetic vicinity of the Dirac point, is reviewed. Radiation of low photon energy is employed in order to match the intrinsic energy scales of the material, i.e. the optical phonon energy (∼200 meV) and the Fermi energy (10‐20 meV), respectively. Significant slower carrier cooling is predicted and observed for photon energies below the optical phonon energy. Furthermore, a strongly anisotropic distribution of electrons in k ‐space upon excitation with linearly polarized radiation is discussed. Depending on photon energy, the anisotropic distribution decays either rapidly via optical phonon emission, or slowly via non‐collinear Coulomb scattering. Finally, a room temperature operated ultra‐broadband hot‐electron bolometer is demonstrated. It covers the spectral range from the THz to visible region with a single detector element featuring a response time of 40 ps.