Population Inversion in Monolayer and Bilayer Graphene
arXiv:1409.0211 · doi:10.1088/0953-8984/27/16/164204
Abstract
The recent demonstration of saturable absorption and negative optical conductivity in the Terahertz range in graphene has opened up new opportunities for optoelectronic applications based on this and other low dimensional materials. Recently, population inversion across the Dirac point has been observed directly by time- and angle-resolved photoemission spectroscopy (tr-ARPES), revealing a relaxation time of only ~ 130 femtoseconds. This severely limits the applicability of single layer graphene to, for example, Terahertz light amplification. Here we use tr-ARPES to demonstrate long-lived population inversion in bilayer graphene. The effect is attributed to the small band gap found in this compound. We propose a microscopic model for these observations and speculate that an enhancement of both the pump photon energy and the pump fluence may further increase this lifetime.
arXiv comment18 pages, 6 figures
References in corpus (26)
- Graphene Mode-Locked Ultrafast Laser
- Quasi-free Standing Epitaxial Graphene on SiC by Hydrogen Intercalation
- Ultrafast Optical-Pump Terahertz-Probe Spectroscopy of the Carrier Relaxation and Recombination Dynamics in Epitaxial Graphene
- Ultrafast collinear scattering and carrier multiplication in graphene
- Ultrafast Photoluminescence from Graphene
- Snapshots of non-equilibrium Dirac carrier distributions in graphene
- Phonon anharmonicities in graphite and 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 dynamics in epitaxial graphene close to the Dirac point
- Carrier Multiplication in Graphene
- Ultrafast Relaxation Dynamics of Hot Optical Phonons in Graphene
- Femtosecond Population Inversion and Stimulated Emission of Dense Dirac Fermions in Graphene
- Supercollision cooling in undoped graphene
- Electron-phonon coupling and electron self-energy in electron-doped graphene: calculation of angular resolved photoemission spectra
- Electron-Phonon Interactions in Graphene, Bilayer Graphene, and Graphite
- Impact of Auger processes on carrier dynamics in graphene
- Time-resolved Raman Spectroscopy of Optical Phonons in Graphite: Phonon Anharmonic Coupling and Anomalous Stiffening
- Examining electron-boson coupling using time-resolved spectroscopy
- Ultrafast Dynamics of Massive Dirac Fermions in Bilayer Graphene
- Anisotropy of excitation and relaxation of photogenerated Dirac electrons in graphene
- Hot phonon decay in supported and suspended exfoliated graphene
- Temperature dependence of the anharmonic decay of optical phonons in carbon nanotubes and graphite
- Microscopic mechanism for transient population inversion and optical gain in graphene
- Ultrafast carrier dynamics in pristine and FeCl3-intercalated bilayer graphene
Cited by in corpus (22)
- Time- and Angle-Resolved Photoemission Studies of Quantum Materials
- 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
- Ultrafast Relaxation Dynamics of Photoexcited Dirac Fermion in The Three Dimensional Dirac Semimetal Cadmium Arsenide
- Decoding the ultrafast formation of a Fermi-Dirac distributed electron gas
- Auger recombination in Dirac materials: A tangle of many-body effects
- Ultrafast Electron Dynamics in Epitaxial Graphene Investigated with Time- and Angle-Resolved Photoemission Spectroscopy
- Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals
- Tunable Terahertz Amplification Based on Photoexcited Active Graphene Hyperbolic Metamaterials
- Valley-polarization in biased bilayer graphene using circularly polarized light
- Microscopic origin of the bolometric effect in graphene
- Detecting light-induced Floquet band gaps of graphene via trARPES
- Hybrid Graphene-Plasmon Gratings
- Observing photo-induced chiral edge states of graphene nanoribbons in pump-probe spectroscopies
- Relativistic suppression of Auger recombination in Weyl semimetals
- Ultrafast Carrier Relaxation Dynamics in a Nodal-Line Semimetal PtSn
- The Nonlinear Optical Effects of Opening a Gap in Graphene
- Conduction band population in graphene in ultrashort strong laser field: case of massive Dirac particles
- Non-equilibrium carrier dynamics and band structure of graphene on 2D tin
- Slow interband recombination promotes an anomalous thermoelectric response of the junctions
- Research on topological materials using ultrafast spectroscopy
- Transient optical gain in strong-field-excited solids