Wake potential in a graphene-sapphire-graphene structure
Само за регистроване кориснике
2019
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
We study the wake effect induced by an external charged particle which moves above various sy1-Al2O3-sy2 composites, where syi (i=1,2) may be vacuum, pristine (undoped) or doped graphene. The polarization functions of graphene sheets are obtained using two approaches within the random phase approximation [1]: an ab initio method and a method based on the massless Dirac fermion approximation. The dynamic response of the layer of Al2O3 (sapphire) is described by a dielectric function consisting of several Lorentzian terms [1]. We evaluate the total electrostatic potential in the plane of the upper graphene sheet (the wake potential). It is shown that in the low velocity limit (below a velocity threshold for the wake given by the Fermi speed of graphene) the charged particle excites only the transverse optical (TO) phonons in the Al2O3 slab and only those phonons contribute to the wake potential. It is also shown that the wake potential is only sensitive on the upper system sy2 such that ...if sy2 is vacuum then TO phonons give intensive oscillations which are strongly reduced if sy2 is graphene.
Извор:
COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts, 2019, 79-79Финансирање / пројекти:
- Функционални, функционализовани и усавршени нано материјали (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45005)
- Хардверска, софтверска, телекомуникациона и енергетска оптимизација ИПТВ система (RS-MESTD-Technological Development (TD or TR)-32039)
- COST action 15107 [Grant No. 41392]
- QuantiXLie Center of Excellence [Grant No. KK.01.1.1.01.0004]
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2016-03689]
Напомена:
- COST Action CA15107 meeting : Aveiro Spring Meeting : March 21-22, Aveiro, Portugal, 2019.
Колекције
Институција/група
VinčaTY - CONF AU - Radović, Ivan AU - Despoja, Vito AU - Karbunar, Lazar AU - Mišković, Zoran PY - 2019 UR - https://vinar.vin.bg.ac.rs/handle/123456789/12707 AB - We study the wake effect induced by an external charged particle which moves above various sy1-Al2O3-sy2 composites, where syi (i=1,2) may be vacuum, pristine (undoped) or doped graphene. The polarization functions of graphene sheets are obtained using two approaches within the random phase approximation [1]: an ab initio method and a method based on the massless Dirac fermion approximation. The dynamic response of the layer of Al2O3 (sapphire) is described by a dielectric function consisting of several Lorentzian terms [1]. We evaluate the total electrostatic potential in the plane of the upper graphene sheet (the wake potential). It is shown that in the low velocity limit (below a velocity threshold for the wake given by the Fermi speed of graphene) the charged particle excites only the transverse optical (TO) phonons in the Al2O3 slab and only those phonons contribute to the wake potential. It is also shown that the wake potential is only sensitive on the upper system sy2 such that if sy2 is vacuum then TO phonons give intensive oscillations which are strongly reduced if sy2 is graphene. C3 - COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts T1 - Wake potential in a graphene-sapphire-graphene structure SP - 79 EP - 79 UR - https://hdl.handle.net/21.15107/rcub_vinar_12707 ER -
@conference{ author = "Radović, Ivan and Despoja, Vito and Karbunar, Lazar and Mišković, Zoran", year = "2019", abstract = "We study the wake effect induced by an external charged particle which moves above various sy1-Al2O3-sy2 composites, where syi (i=1,2) may be vacuum, pristine (undoped) or doped graphene. The polarization functions of graphene sheets are obtained using two approaches within the random phase approximation [1]: an ab initio method and a method based on the massless Dirac fermion approximation. The dynamic response of the layer of Al2O3 (sapphire) is described by a dielectric function consisting of several Lorentzian terms [1]. We evaluate the total electrostatic potential in the plane of the upper graphene sheet (the wake potential). It is shown that in the low velocity limit (below a velocity threshold for the wake given by the Fermi speed of graphene) the charged particle excites only the transverse optical (TO) phonons in the Al2O3 slab and only those phonons contribute to the wake potential. It is also shown that the wake potential is only sensitive on the upper system sy2 such that if sy2 is vacuum then TO phonons give intensive oscillations which are strongly reduced if sy2 is graphene.", journal = "COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts", title = "Wake potential in a graphene-sapphire-graphene structure", pages = "79-79", url = "https://hdl.handle.net/21.15107/rcub_vinar_12707" }
Radović, I., Despoja, V., Karbunar, L.,& Mišković, Z.. (2019). Wake potential in a graphene-sapphire-graphene structure. in COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts, 79-79. https://hdl.handle.net/21.15107/rcub_vinar_12707
Radović I, Despoja V, Karbunar L, Mišković Z. Wake potential in a graphene-sapphire-graphene structure. in COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts. 2019;:79-79. https://hdl.handle.net/21.15107/rcub_vinar_12707 .
Radović, Ivan, Despoja, Vito, Karbunar, Lazar, Mišković, Zoran, "Wake potential in a graphene-sapphire-graphene structure" in COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts (2019):79-79, https://hdl.handle.net/21.15107/rcub_vinar_12707 .