We calculate the stopping and image forces on a point charge moving over a single-layer graphene grown on an SiC substrate, and compare them with forces arising when a charge moves over a two-dimensional electron gas (2DEG) in an Ag monolayer on a Si substrate. Given that both these systems constitute a one-atom thick 2DEG, major differences are found in the velocity and distance dependencies of the two forces owing to different electronic structures of the respective 2DEG. Within the massless Dirac fermion picture of graphenes pi electron bands, the inter-band single particle excitations are found to affect the stopping and image forces at high speeds in a substantial way, whereas such excitations are absent in the 2DEG of the metallic layer described by a single parabolic band. (C) 2010 Elsevier B.V. All rights reserved.
Кључне речи:
graphene / 2D electron gas / Dielectric function / Stopping power / Image interaction
Извор:
Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 2011, 269, 11, 1225-1228
Финансирање / пројекти:
Ministry of Science and Technological Development of the Republic of Serbia
Напомена:
18th International Workshop on Inelastic Ion-Surface Collisions (IISC-18), Sep 26-Oct 01, 2010, Gatlinburg, TN
TY - JOUR
AU - Borka, Duško
AU - Radović, Ivan
AU - Mišković, Zoran L.
PY - 2011
UR - https://vinar.vin.bg.ac.rs/handle/123456789/6927
AB - We calculate the stopping and image forces on a point charge moving over a single-layer graphene grown on an SiC substrate, and compare them with forces arising when a charge moves over a two-dimensional electron gas (2DEG) in an Ag monolayer on a Si substrate. Given that both these systems constitute a one-atom thick 2DEG, major differences are found in the velocity and distance dependencies of the two forces owing to different electronic structures of the respective 2DEG. Within the massless Dirac fermion picture of graphenes pi electron bands, the inter-band single particle excitations are found to affect the stopping and image forces at high speeds in a substantial way, whereas such excitations are absent in the 2DEG of the metallic layer described by a single parabolic band. (C) 2010 Elsevier B.V. All rights reserved.
T2 - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
T1 - Dynamic polarization of graphene by moving external charges: Comparison with 2D electron gas
VL - 269
IS - 11
SP - 1225
EP - 1228
DO - 10.1016/j.nimb.2010.10.021
ER -
@article{
author = "Borka, Duško and Radović, Ivan and Mišković, Zoran L.",
year = "2011",
abstract = "We calculate the stopping and image forces on a point charge moving over a single-layer graphene grown on an SiC substrate, and compare them with forces arising when a charge moves over a two-dimensional electron gas (2DEG) in an Ag monolayer on a Si substrate. Given that both these systems constitute a one-atom thick 2DEG, major differences are found in the velocity and distance dependencies of the two forces owing to different electronic structures of the respective 2DEG. Within the massless Dirac fermion picture of graphenes pi electron bands, the inter-band single particle excitations are found to affect the stopping and image forces at high speeds in a substantial way, whereas such excitations are absent in the 2DEG of the metallic layer described by a single parabolic band. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
title = "Dynamic polarization of graphene by moving external charges: Comparison with 2D electron gas",
volume = "269",
number = "11",
pages = "1225-1228",
doi = "10.1016/j.nimb.2010.10.021"
}
Borka, D., Radović, I.,& Mišković, Z. L.. (2011). Dynamic polarization of graphene by moving external charges: Comparison with 2D electron gas. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 269(11), 1225-1228.
https://doi.org/10.1016/j.nimb.2010.10.021
Borka D, Radović I, Mišković ZL. Dynamic polarization of graphene by moving external charges: Comparison with 2D electron gas. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2011;269(11):1225-1228.
doi:10.1016/j.nimb.2010.10.021 .
Borka, Duško, Radović, Ivan, Mišković, Zoran L., "Dynamic polarization of graphene by moving external charges: Comparison with 2D electron gas" in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 269, no. 11 (2011):1225-1228,
https://doi.org/10.1016/j.nimb.2010.10.021 . .
