TY  - CONF
AU  - Kalinić, Ana
AU  - Radović, Ivan
AU  - Karbunar, Lazar
AU  - Despoja, Vito
AU  - Mišković, Zoran L.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12676
AB  - In our recent publication1 we have studied the wake potential induced by an external charged particle that moves parallel to various sy1-Al2O3-sy2 composites, where syi (with i=1,2) may be vacuum, pristine graphene, or doped graphene. Several important parameters were fixed at their respective typical values: the distance of the charged particle from the closest surface, the thickness of the sapphire (aluminum oxide, Al2O3) layer, and the doping density (i.e., Fermi energy) of graphene. In this work we present a detailed study of the effects due to variations of all those parameters in the case of the wake potential produced by charged particle moving parallel to the graphene-Al2O3- graphene composite system, by using the dynamic polarization function of graphene within the random phase approximation for its π electrons described as Dirac’s fermions and by using a local dielectric function for the sapphire layer2 . For the velocity of the charged particle below the threshold for excitations of the Dirac plasmon in graphene, given by its Fermi velocity vF, strong effects are observed due to variation of the particle distance, while for the velocity of the charged particle above vF strong effects are observed due to varying the thickness of the Al2O3 layer, as well as due to graphene doping.
PB  - Gradec, Slovenija : Fakulteta za tehnologijo polimerov
C3  - COST Action CA15107 : Final Multicomp meeting : Book of Abstracts
T1  - Wake effect in interactions of ions with graphene-sapphire-graphene structure
SP  - 33
EP  - 33
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12676
ER  - 

@conference{
author = "Kalinić, Ana and Radović, Ivan and Karbunar, Lazar and Despoja, Vito and Mišković, Zoran L.",
year = "2020",
abstract = "In our recent publication1 we have studied the wake potential induced by an external charged particle that moves parallel to various sy1-Al2O3-sy2 composites, where syi (with i=1,2) may be vacuum, pristine graphene, or doped graphene. Several important parameters were fixed at their respective typical values: the distance of the charged particle from the closest surface, the thickness of the sapphire (aluminum oxide, Al2O3) layer, and the doping density (i.e., Fermi energy) of graphene. In this work we present a detailed study of the effects due to variations of all those parameters in the case of the wake potential produced by charged particle moving parallel to the graphene-Al2O3- graphene composite system, by using the dynamic polarization function of graphene within the random phase approximation for its π electrons described as Dirac’s fermions and by using a local dielectric function for the sapphire layer2 . For the velocity of the charged particle below the threshold for excitations of the Dirac plasmon in graphene, given by its Fermi velocity vF, strong effects are observed due to variation of the particle distance, while for the velocity of the charged particle above vF strong effects are observed due to varying the thickness of the Al2O3 layer, as well as due to graphene doping.",
publisher = "Gradec, Slovenija : Fakulteta za tehnologijo polimerov",
journal = "COST Action CA15107 : Final Multicomp meeting : Book of Abstracts",
title = "Wake effect in interactions of ions with graphene-sapphire-graphene structure",
pages = "33-33",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12676"
}

Kalinić, A., Radović, I., Karbunar, L., Despoja, V.,& Mišković, Z. L.. (2020). Wake effect in interactions of ions with graphene-sapphire-graphene structure. in COST Action CA15107 : Final Multicomp meeting : Book of Abstracts
Gradec, Slovenija : Fakulteta za tehnologijo polimerov., 33-33.
https://hdl.handle.net/21.15107/rcub_vinar_12676

Kalinić A, Radović I, Karbunar L, Despoja V, Mišković ZL. Wake effect in interactions of ions with graphene-sapphire-graphene structure. in COST Action CA15107 : Final Multicomp meeting : Book of Abstracts. 2020;:33-33.
https://hdl.handle.net/21.15107/rcub_vinar_12676 .

Kalinić, Ana, Radović, Ivan, Karbunar, Lazar, Despoja, Vito, Mišković, Zoran L., "Wake effect in interactions of ions with graphene-sapphire-graphene structure" in COST Action CA15107 : Final Multicomp meeting : Book of Abstracts (2020):33-33,
https://hdl.handle.net/21.15107/rcub_vinar_12676 .

TY  - CONF
AU  - Radović, Ivan
AU  - Despoja, Vito
AU  - Mišković, Zoran L.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12708
AB  - We present an analytical modeling of the experimental electron energyloss(EEL)spectroscopy data for free-standing graphene obtained by scanning transmission electron microscope using a two-dimensional, two-fluid extended hydrodynamic (eHD) model and an ab initio method [1]. An analytical expression for the probability density for energyloss of fast electrons traversing graphene under normal incidence is derived in the long wavelength limit in terms of an arbitrary form of the conductivity of graphene given in the local, i.e., frequencydependent form. The calculated probability density from both theoretical modelsis directlycompared with the EEL spectra from three independent experiments [2-4] and we find verygood agreement, especially in the case of the eHD model. Furthermore, we point out that the method of subtraction of the zero-loss peak from the experimental EEL spectra maystronglyaffect agreement with analytical models.
C3  - Autumn Prague Meeting : COST Action CA15107 meeting : Book of Abstracts
T1  - Analytical modeling of experimental EELS data for free-standing graphene
SP  - 77
EP  - 77
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12708
ER  - 

@conference{
author = "Radović, Ivan and Despoja, Vito and Mišković, Zoran L.",
year = "2019",
abstract = "We present an analytical modeling of the experimental electron energyloss(EEL)spectroscopy data for free-standing graphene obtained by scanning transmission electron microscope using a two-dimensional, two-fluid extended hydrodynamic (eHD) model and an ab initio method [1]. An analytical expression for the probability density for energyloss of fast electrons traversing graphene under normal incidence is derived in the long wavelength limit in terms of an arbitrary form of the conductivity of graphene given in the local, i.e., frequencydependent form. The calculated probability density from both theoretical modelsis directlycompared with the EEL spectra from three independent experiments [2-4] and we find verygood agreement, especially in the case of the eHD model. Furthermore, we point out that the method of subtraction of the zero-loss peak from the experimental EEL spectra maystronglyaffect agreement with analytical models.",
journal = "Autumn Prague Meeting : COST Action CA15107 meeting : Book of Abstracts",
title = "Analytical modeling of experimental EELS data for free-standing graphene",
pages = "77-77",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12708"
}

Radović, I., Despoja, V.,& Mišković, Z. L.. (2019). Analytical modeling of experimental EELS data for free-standing graphene. in Autumn Prague Meeting : COST Action CA15107 meeting : Book of Abstracts, 77-77.
https://hdl.handle.net/21.15107/rcub_vinar_12708

Radović I, Despoja V, Mišković ZL. Analytical modeling of experimental EELS data for free-standing graphene. in Autumn Prague Meeting : COST Action CA15107 meeting : Book of Abstracts. 2019;:77-77.
https://hdl.handle.net/21.15107/rcub_vinar_12708 .

Radović, Ivan, Despoja, Vito, Mišković, Zoran L., "Analytical modeling of experimental EELS data for free-standing graphene" in Autumn Prague Meeting : COST Action CA15107 meeting : Book of Abstracts (2019):77-77,
https://hdl.handle.net/21.15107/rcub_vinar_12708 .