TY - JOUR
T1 - Nonlocal Screening of Plasmons in Graphene by Semiconducting and Metallic Substrates
T2 - First-Principles Calculations
AU - Yan, Jun
AU - Thygesen, Kristian Sommer
AU - Jacobsen, Karsten Wedel
PY - 2011
Y1 - 2011
N2 - We investigate the role of substrates on the collective excitations of graphene by using a first-principles implementation of the density response function within the random-phase approximation. Specifically, we consider graphene adsorbed on SiC(0001) and Al(111) as representative examples of a semiconducting and metallic substrate. On SiC(0001), the long wavelength π plasmons are significantly damped although their energies remain almost unaltered. On Al(111), the long wavelength π plasmons are completely quenched due to the coupling to the metal surface plasmon. The strong damping of the plasmon excitations occurs despite the fact that the single-particle band structure of graphene is completely unaffected by the substrates illustrating the nonlocal nature of the effect.
AB - We investigate the role of substrates on the collective excitations of graphene by using a first-principles implementation of the density response function within the random-phase approximation. Specifically, we consider graphene adsorbed on SiC(0001) and Al(111) as representative examples of a semiconducting and metallic substrate. On SiC(0001), the long wavelength π plasmons are significantly damped although their energies remain almost unaltered. On Al(111), the long wavelength π plasmons are completely quenched due to the coupling to the metal surface plasmon. The strong damping of the plasmon excitations occurs despite the fact that the single-particle band structure of graphene is completely unaffected by the substrates illustrating the nonlocal nature of the effect.
U2 - 10.1103/PhysRevLett.106.146803
DO - 10.1103/PhysRevLett.106.146803
M3 - Journal article
C2 - 21561211
VL - 106
SP - 146803
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 14
ER -