Dynamic-Polarization Forces Acting On A Charged Particle Moving Over A Graphene-Sapphire-Graphene Heterostructure
Апстракт
We investigate the stopping and image forces acting on an external charged particle moving parallel to a sandwich-like structure consisting of two graphene sheets separated by a layer of Al2O3 (sapphire), as depicted in FIG. 1. The effective dielectric function of the system is obtained using two descriptions of the electronic response of doped graphene: an ab initio method based on the time-dependent density functional theory calculations and an analytical expression based on the massless Dirac fermion (MDF) approximation for graphene π bands. It is found that the main discrepancies between the two methods come from the high-energy interband electron transitions, which are included in the ab initio method but not in the MDF method. Special attention is paid to the regime of low-particle speeds, where the MDF method compares well with the ab initio method, but the modeling is sensitive to the effects of finite temperature and the treatment of phenomenological damping. We also provide a... semi-analytical analysis based on a modal decomposition of the energy loss function, for which we discuss the limit of a thick graphene-Al2O3-graphene structure.
Извор:
SFKM 2023 : The 21st Symposium on Condensed Matter Physics : Book of abstracts, 2023, 82-82Колекције
Институција/група
VinčaTY - CONF AU - Kalinić, Ana AU - Radović, Ivan AU - Despoja, Vito AU - Karbunar, Lazar AU - Mišković, Zoran PY - 2023 UR - https://vinar.vin.bg.ac.rs/handle/123456789/12056 AB - We investigate the stopping and image forces acting on an external charged particle moving parallel to a sandwich-like structure consisting of two graphene sheets separated by a layer of Al2O3 (sapphire), as depicted in FIG. 1. The effective dielectric function of the system is obtained using two descriptions of the electronic response of doped graphene: an ab initio method based on the time-dependent density functional theory calculations and an analytical expression based on the massless Dirac fermion (MDF) approximation for graphene π bands. It is found that the main discrepancies between the two methods come from the high-energy interband electron transitions, which are included in the ab initio method but not in the MDF method. Special attention is paid to the regime of low-particle speeds, where the MDF method compares well with the ab initio method, but the modeling is sensitive to the effects of finite temperature and the treatment of phenomenological damping. We also provide a semi-analytical analysis based on a modal decomposition of the energy loss function, for which we discuss the limit of a thick graphene-Al2O3-graphene structure. C3 - SFKM 2023 : The 21st Symposium on Condensed Matter Physics : Book of abstracts T1 - Dynamic-Polarization Forces Acting On A Charged Particle Moving Over A Graphene-Sapphire-Graphene Heterostructure SP - 82 EP - 82 UR - https://hdl.handle.net/21.15107/rcub_vinar_12056 ER -
@conference{ author = "Kalinić, Ana and Radović, Ivan and Despoja, Vito and Karbunar, Lazar and Mišković, Zoran", year = "2023", abstract = "We investigate the stopping and image forces acting on an external charged particle moving parallel to a sandwich-like structure consisting of two graphene sheets separated by a layer of Al2O3 (sapphire), as depicted in FIG. 1. The effective dielectric function of the system is obtained using two descriptions of the electronic response of doped graphene: an ab initio method based on the time-dependent density functional theory calculations and an analytical expression based on the massless Dirac fermion (MDF) approximation for graphene π bands. It is found that the main discrepancies between the two methods come from the high-energy interband electron transitions, which are included in the ab initio method but not in the MDF method. Special attention is paid to the regime of low-particle speeds, where the MDF method compares well with the ab initio method, but the modeling is sensitive to the effects of finite temperature and the treatment of phenomenological damping. We also provide a semi-analytical analysis based on a modal decomposition of the energy loss function, for which we discuss the limit of a thick graphene-Al2O3-graphene structure.", journal = "SFKM 2023 : The 21st Symposium on Condensed Matter Physics : Book of abstracts", title = "Dynamic-Polarization Forces Acting On A Charged Particle Moving Over A Graphene-Sapphire-Graphene Heterostructure", pages = "82-82", url = "https://hdl.handle.net/21.15107/rcub_vinar_12056" }
Kalinić, A., Radović, I., Despoja, V., Karbunar, L.,& Mišković, Z.. (2023). Dynamic-Polarization Forces Acting On A Charged Particle Moving Over A Graphene-Sapphire-Graphene Heterostructure. in SFKM 2023 : The 21st Symposium on Condensed Matter Physics : Book of abstracts, 82-82. https://hdl.handle.net/21.15107/rcub_vinar_12056
Kalinić A, Radović I, Despoja V, Karbunar L, Mišković Z. Dynamic-Polarization Forces Acting On A Charged Particle Moving Over A Graphene-Sapphire-Graphene Heterostructure. in SFKM 2023 : The 21st Symposium on Condensed Matter Physics : Book of abstracts. 2023;:82-82. https://hdl.handle.net/21.15107/rcub_vinar_12056 .
Kalinić, Ana, Radović, Ivan, Despoja, Vito, Karbunar, Lazar, Mišković, Zoran, "Dynamic-Polarization Forces Acting On A Charged Particle Moving Over A Graphene-Sapphire-Graphene Heterostructure" in SFKM 2023 : The 21st Symposium on Condensed Matter Physics : Book of abstracts (2023):82-82, https://hdl.handle.net/21.15107/rcub_vinar_12056 .