Dynamic polarization of graphene by external correlated charges
Само за регистроване кориснике
2012
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We use the dielectric response formalism within random phase approximation for graphenes pi-electron bands to study polarization of doped, single-layer graphene in the presence of a moving dipole and a pair of comoving ions, as well as to study the electrostatic part of the long-range interaction in the coadsorption of two ions and two dipoles on graphene. We find that the vector components of both the force and the torque on the moving dipole include both the conservative and dissipative contributions, whereas the wake in the induced charge density in graphene shows asymmetry with respect to the direction of dipoles motion. Furthermore, the screened interaction energy between two comoving ions shows oscillations as a function of the interionic separation that may give rise to a wake-riding bound state of the ions, whereas the total energy loss of those ions shows both constructive and destructive interference effects in comparison with the energy loss of independent ions. In the case ...of static coadsorption on doped graphene, strong screening of the ion-ion electrostatic interaction energy is found as a function of their separation, whereas antiscreening is found in the interaction energy between two dipoles having dipole moments perpendicular to graphene. In addition, shallow minima are found in the interaction energies at finite separations between two ions and between two dipoles having dipole moments parallel to graphene due to Friedel oscillations, which are shown to be much weaker than in the case of coadsorption on a comparable two-dimensional electron gas with single parabolic energy band. It is shown that the interaction of graphene with all the above model systems may be effectively controlled by changing the doping density of graphene.
Извор:
Physical Review B: Condensed Matter and Materials Physics, 2012, 86, 12Финансирање / пројекти:
- Функционални, функционализовани и усавршени нано материјали (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45005)
- Natural Sciences and Engineering Research Council of Canada
DOI: 10.1103/PhysRevB.86.125442
ISSN: 1098-0121; 1550-235X
WoS: 000309180400002
Scopus: 2-s2.0-84867017566
Колекције
Институција/група
VinčaTY - JOUR AU - Radović, Ivan AU - Borka, Duško AU - Mišković, Zoran L. PY - 2012 UR - https://vinar.vin.bg.ac.rs/handle/123456789/5049 AB - We use the dielectric response formalism within random phase approximation for graphenes pi-electron bands to study polarization of doped, single-layer graphene in the presence of a moving dipole and a pair of comoving ions, as well as to study the electrostatic part of the long-range interaction in the coadsorption of two ions and two dipoles on graphene. We find that the vector components of both the force and the torque on the moving dipole include both the conservative and dissipative contributions, whereas the wake in the induced charge density in graphene shows asymmetry with respect to the direction of dipoles motion. Furthermore, the screened interaction energy between two comoving ions shows oscillations as a function of the interionic separation that may give rise to a wake-riding bound state of the ions, whereas the total energy loss of those ions shows both constructive and destructive interference effects in comparison with the energy loss of independent ions. In the case of static coadsorption on doped graphene, strong screening of the ion-ion electrostatic interaction energy is found as a function of their separation, whereas antiscreening is found in the interaction energy between two dipoles having dipole moments perpendicular to graphene. In addition, shallow minima are found in the interaction energies at finite separations between two ions and between two dipoles having dipole moments parallel to graphene due to Friedel oscillations, which are shown to be much weaker than in the case of coadsorption on a comparable two-dimensional electron gas with single parabolic energy band. It is shown that the interaction of graphene with all the above model systems may be effectively controlled by changing the doping density of graphene. T2 - Physical Review B: Condensed Matter and Materials Physics T1 - Dynamic polarization of graphene by external correlated charges VL - 86 IS - 12 DO - 10.1103/PhysRevB.86.125442 ER -
@article{ author = "Radović, Ivan and Borka, Duško and Mišković, Zoran L.", year = "2012", abstract = "We use the dielectric response formalism within random phase approximation for graphenes pi-electron bands to study polarization of doped, single-layer graphene in the presence of a moving dipole and a pair of comoving ions, as well as to study the electrostatic part of the long-range interaction in the coadsorption of two ions and two dipoles on graphene. We find that the vector components of both the force and the torque on the moving dipole include both the conservative and dissipative contributions, whereas the wake in the induced charge density in graphene shows asymmetry with respect to the direction of dipoles motion. Furthermore, the screened interaction energy between two comoving ions shows oscillations as a function of the interionic separation that may give rise to a wake-riding bound state of the ions, whereas the total energy loss of those ions shows both constructive and destructive interference effects in comparison with the energy loss of independent ions. In the case of static coadsorption on doped graphene, strong screening of the ion-ion electrostatic interaction energy is found as a function of their separation, whereas antiscreening is found in the interaction energy between two dipoles having dipole moments perpendicular to graphene. In addition, shallow minima are found in the interaction energies at finite separations between two ions and between two dipoles having dipole moments parallel to graphene due to Friedel oscillations, which are shown to be much weaker than in the case of coadsorption on a comparable two-dimensional electron gas with single parabolic energy band. It is shown that the interaction of graphene with all the above model systems may be effectively controlled by changing the doping density of graphene.", journal = "Physical Review B: Condensed Matter and Materials Physics", title = "Dynamic polarization of graphene by external correlated charges", volume = "86", number = "12", doi = "10.1103/PhysRevB.86.125442" }
Radović, I., Borka, D.,& Mišković, Z. L.. (2012). Dynamic polarization of graphene by external correlated charges. in Physical Review B: Condensed Matter and Materials Physics, 86(12). https://doi.org/10.1103/PhysRevB.86.125442
Radović I, Borka D, Mišković ZL. Dynamic polarization of graphene by external correlated charges. in Physical Review B: Condensed Matter and Materials Physics. 2012;86(12). doi:10.1103/PhysRevB.86.125442 .
Radović, Ivan, Borka, Duško, Mišković, Zoran L., "Dynamic polarization of graphene by external correlated charges" in Physical Review B: Condensed Matter and Materials Physics, 86, no. 12 (2012), https://doi.org/10.1103/PhysRevB.86.125442 . .