Electron decay rates in a zero-gap graphite layer

Coulomb Excitations and Decays in Graphene-Related Systems

“…The Coulomb inelastic scatterings of the Fermi-momentum state (the Dirac point) only utilize the intraband e-h excitations, with any transferred momenta,leading to the non-specific T -dependence. The calculated decay rate is close to the measured results of the layered graphite [274,472]. The intraband e-h excitations also make important contributions to other states.…”

Experimental studies of the electronic structure of graphene

“…In Fermi-liquid theory for 3D solids, α = 2 is derived, and for a 2D solid where a dependence ω 2 lnω was predicted [146,147]. The influence of the unique band structure on quasiparticle scattering rates in graphene was analyzed by several groups [135,[148][149][150][151]. The situation is quite different from a normal 2D electron gas since a hole originating at ω just below E D has few possible decays with sufficient momentum transfer to excite an e-h pair [ Fig.…”

Coulomb decay rates in monolayer doped graphene

“…The doping-dependent Coulomb decay rates of monolayer graphene/a single-walled carbon nanotube could also be calculated from the Fermi-golden rule. 1 The bare and screened Coulomb potentials are the critical mechanisms in understanding the electronic excitations and deexcitations. The square of the bare Coulomb interaction, which includes the band-structure effect, is expressed as…”

“…There are some theoretical [1][2][3][4][5][6][7][8][9][10][11][12][13] and experimental [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] studies on the decay rates of the quasiparticle states in layered graphenes, Bernal graphite, and carbon nanotubes. The electron-electron (e-e) Coulomb scatterings, 1,2,4,5,33 as well as the electron-phonon (e-ph) scatterings, 1,4,[13][14][15][16][17][18]26,28,29,33 play critical roles in the decay rates (the mean free paths) of the excited electron/hole states, especially for the former. By using the self-energy method 34 and the Fermi-golden rule, the theoretical predictions of Coulomb de...…”

“…48 In addition to the interband excitations, the dopinginduced intraband excitations and acoustic/optical plasmons are very effective deexcitation channels. 1,4 For donor-type systems with E F $ 1 eV, the excited valence bands present the oscillatory energy dependence, in which the largest energy widths even achieve the order of 0.1 eV because of the strong plasmon decay channels. The highly anisotropic behavior is revealed under the calculations of the tight-binding model, such as, the directiondependent Coulomb decay rates in doped graphene, 1,43,46 silicene and germanene at large wave vectors.…”