Photoexcitation Cascade and Quantum-Relativistic Jets in Graphene
arXiv:1802.03758 · doi:10.1103/PhysRevLett.120.076601
Abstract
In Dirac materials linear band dispersion blocks momentum-conserving interband transitions, creating a bottleneck for electron-hole pair production and carrier multiplication in the photoexcitation cascade. Here we show that the decays are unblocked and the bottleneck is relieved by subtle many-body effects involving multiple off-shell e-h pairs. The decays result from a collective behavior due to emission of many soft pairs. We discuss characteristic signatures of the off-shell pathways, in particular the sharp angular distribution of secondary carriers, resembling relativistic jets in high-energy physics. The jets can be directly probed using solid-state equivalent of particle detectors. Collinear scattering enhances carrier multiplication, allowing for emission of as many as secondary carriers per single absorbed photon.
arXiv comment11 pages, 3 figures
References in corpus (20)
- The electronic properties of graphene
- Dielectric function, screening, and plasmons in 2D graphene
- Dynamical polarization of graphene at finite doping
- Ultrafast collinear scattering and carrier multiplication in graphene
- Marginal Fermi liquid behavior from 2d Coulomb interaction
- Photocurrent measurements of supercollision cooling in graphene
- Quantum critical point in graphene approached in the limit of infinitely strong Coulomb interaction
- Unconventional quasiparticle lifetime in graphite
- Slow imbalance relaxation and thermoelectric transport in graphene
- Non-equilibrium dynamics of photo-excited electrons in graphene: collinear scattering, Auger processes, and the impact of screening
- Electron-Hole Generation and Recombination Rates for Coulomb Scattering in Graphene
- Impact of Auger processes on carrier dynamics in graphene
- Photo-excited Carrier Dynamics and Impact Excitation Cascade in Graphene
- Hot-carrier photocurrent effects at graphene-metal interfaces
- Coulomb interaction in graphene: Relaxation rates and transport
- Why does graphene behave as a weakly interacting system?
- Effective field theory, three-loop perturbative expansion, and their experimental implications in graphene many-body effects
- Energy Flows in Graphene: Hot Carrier Dynamics and Cooling
- Slow noncollinear Coulomb scattering in the vicinity of the Dirac point in graphene
- Collinear scattering of photoexcited carriers in graphene