Tunable Carrier Multiplication and Cooling in Graphene

Abstract

Time- and angle-resolved photoemission measurements on two doped graphene samples displaying different doping levels reveal remarkable differences in the ultrafast dynamics of the hot carriers in the Dirac cone. In the more strongly ($n$-)doped graphene, we observe larger carrier multiplication factors ($>$ 3) and a significantly faster phonon-mediated cooling of the carriers back to equilibrium compared to in the less ($p$-)doped graphene. These results suggest that a careful tuning of the doping level allows for an effective manipulation of graphene's dynamical response to a photoexcitation.

arXiv comment17 pages, 3 figures

References in corpus (28)

• Graphene Photonics and Optoelectronics
• Graphene Mode-Locked Ultrafast Laser
• Tuning the graphene work function by electric field effect
• Electron-Electron Interactions in Graphene: Current Status and Perspectives
• Quasi-free Standing Epitaxial Graphene on SiC by Hydrogen Intercalation
• Acoustic phonon scattering limited carrier mobility in 2D extrinsic graphene
• Ultrafast Optical-Pump Terahertz-Probe Spectroscopy of the Carrier Relaxation and Recombination Dynamics in Epitaxial Graphene
• Photo-excitation Cascade and Multiple Carrier Generation in Graphene
• Ultrafast collinear scattering and carrier multiplication in graphene
• Photocurrent imaging and efficient photon detection in a graphene transistor
• Snapshots of non-equilibrium Dirac carrier distributions in graphene
• Hot Carrier Transport and Photocurrent Response in Graphene
• Direct view on the ultrafast carrier dynamics in graphene
• Photocurrent measurements of supercollision cooling in graphene
• Disorder-Assisted Electron-Phonon Scattering and Cooling Pathways in Graphene
• Carrier Multiplication in Graphene
• Electronic Cooling in Graphene
• The Origin of Doping in Quasi-Free Standing Graphene on Silicon Carbide
• Supercollision cooling in undoped graphene
• Electron-Hole Generation and Recombination Rates for Coulomb Scattering in Graphene
• Semiconducting-to-metallic photoconductivity crossover and temperature-dependent Drude weight in graphene
• Impact of Auger processes on carrier dynamics in graphene
• Ultrafast Dynamics of Massive Dirac Fermions in Bilayer Graphene
• Competing Ultrafast Energy Relaxation Pathways in Photoexcited Graphene
• Ultrafast photodoping and effective Fermi-Dirac distribution of the Dirac particles in Bi2Se3
• Photo-excited Carrier Dynamics and Impact Excitation Cascade in Graphene
• Anisotropy of excitation and relaxation of photogenerated Dirac electrons in graphene
• Extracting the Temperature of Hot Carriers in Time- and Angle-Resolved Photoemission

Cited by in corpus (25)

• Hot carriers in graphene -- fundamentals and applications
• The ultrafast dynamics and conductivity of photoexcited graphene at different Fermi energies
• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Ultrafast Band Structure Control of a Two-Dimensional Heterostructure
• Tracking primary thermalization events in graphene with photoemission at extreme timescales
• Ultrafast dynamics of electrons and phonons: from the two-temperature model to the time-dependent Boltzmann equation
• Real-time GW: Toward an ab initio description of the ultrafast carrier and exciton dynamics in two-dimensional materials
• Time-Resolved Momentum Microscopy with a 1 MHz High-Harmonic Extreme Ultraviolet Beamline
• Impact of doping on the carrier dynamics in graphene
• Photoemission Signatures of Non-Equilibrium Carrier Dynamics from First Principles
• Carrier dynamics in graphene: ultrafast many-particle phenomena
• Experimental Characterization of Ultrafast, Tunable and Broadband Optical Kerr Nonlinearity in Graphene
• Self-energy dynamics and mode-specific phonon threshold effect in a Kekulé-ordered graphene
• Spin-, time- and angle-resolved photoemission spectroscopy on WTe${}_2$
• Ultrafast electronic line width broadening in the C 1s core level of graphene
• Review on carrier multiplication in graphene
• Excitonic instability in optically-pumped three-dimensional Dirac materials
• HHG-laser-based time- and angle-resolved photoemission spectroscopy of quantum materials
• Ultrafast carrier dynamics throughout the three-dimensional Brillouin zone of the Weyl semimetal PtBi${}_2$
• Electron heating and mechanical properties of graphene
• Momentum-space Observation of Optically Excited Non-Thermal Electrons in Graphene with Persistent Pseudospin Polarization
• Electron dynamics in a three-dimensional Brillouin zone analysed by machine learning
• Non-equilibrium carrier dynamics and band structure of graphene on 2D tin
• Symmetry-breaking and spin-blockage effects on carrier dynamics in single-layer tungsten diselenide
• Multiple Hot-Carrier Collection in Photo-Excited Graphene Moire Superlattices