2017/10/15 by Po-Hsin Shih, Chih‐Wei Chiu, Chih-Wei Chiu +3 · 15 citations
Chemistry · Materials Science · Physics and Astronomy · #Atomic physics #Condensed matter physics #Coulomb #Doping #Electron #Electron scattering #Excited state #Fullerene Chemistry and Applications #Germanene #Graphene #Graphene research and applications #Materials science #Monolayer #Mott scattering #Nanotechnology #Neutron scattering #Physics #Quantum mechanics #Scattering #Silicene #Small-angle neutron scattering #Topological Materials and Phenomena #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.97.195302
published in Physical review. B./Physical review. B 97(19) (American Physical Society)
arxiv created 2017/10/15 · openalex created_date 2017/11/10 · openalex publication_date 2018/05/03 · arxiv updated 2018/05/09 · openalex updated_date 2026/08/05
Excited conduction electrons, conduction holes, and valence holes in monolayer electron-doped germanene exhibit unusual Coulomb decay rates. The deexcitation processes are studied using the screened exchange energy. They might utilize the intraband single-particle excitations (SPEs), the interband SPEs, and the plasmon modes, depending on the quasiparticle states and the Fermi energies. The low-lying valence holes can decay through the undamped acoustic plasmon, so that they present very fast Coulomb deexcitations, nonmonotonous energy dependence, and anisotropic behavior. However, the low-energy conduction electrons and holes are similar to those in a two-dimensional electron gas. The higher-energy conduction states and the deeper-energy valence ones behave similarly in the available deexcitation channels and have a similar dependence of decay rate on the wave vector k.