Strongly Coupled Optical Phonons in the Ultrafast Dynamics of the Electronic Energy and Current Relaxation in Graphite

Tobias Kampfrath; L. Perfetti; Florian Schapper; Christian Frischkorn; Martin Wolf

doi:10.1103/physrevlett.95.187403

Abstract

Ultrafast charge carrier dynamics in graphite has been investigated by time-resolved terahertz spectroscopy. Analysis of the transient dielectric function and model calculations show that more than 90% of the initially deposited excitation energy is transferred to a few strongly coupled lattice vibrations within 500 fs. These hot optical phonons also substantially contribute to the striking increase of the Drude relaxation rate observed during the first picosecond after photoexcitation. The subsequent cooling of the hot phonons yields a lifetime estimate of 7 ps for these modes.

Keywords

PhotoexcitationPhononPicosecondMaterials scienceUltrashort pulseRelaxation (psychology)ExcitationTerahertz radiationCondensed matter physicsGraphiteRaman spectroscopySpectroscopyCharge carrierAtomic physicsFemtosecondLaserPhysicsOptoelectronicsOptics

Affiliated Institutions

Freie Universität Berlin DE

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Publication Info

Year: 2005
Type: article
Volume: 95
Issue: 18
Pages: 187403-187403
Citations: 353
Access: Closed

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APA Style

                            
                                
                                    Tobias Kampfrath, 
                                
                                    L. Perfetti, 
                                
                                    Florian Schapper
                                
                                et al.
                            
                            (2005). 
                            Strongly Coupled Optical Phonons in the Ultrafast Dynamics of the Electronic Energy and Current Relaxation in Graphite. 
                            Physical Review Letters
                            , 95
                            (18)
                            , 187403-187403.
                            https://doi.org/10.1103/physrevlett.95.187403
                        

Identifiers

DOI: 10.1103/physrevlett.95.187403