Temperature effect on plasmon dispersions in double-layer graphene systems

Vazifehshenas, T.; Amlaki, T.; Farmanbar, M.; Parhizgar, Fariborz

doi:10.1016/j.physleta.2010.10.026

Cited by 57 publications

(59 citation statements)

References 18 publications

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“…We have performed numerical calculations based on the balance equation theory to obtain the energy transfer rate, 12 P , for a DLG system in the linear regime. We have accounted for the screening effects by using the temperature dependent dynamic RPA dielectric function for a two-component system.…”

Section: Resultsmentioning

confidence: 99%

“…The effect of interlayer spacing on 12 P in both double-layer systems with identical layer electron densities, and 50nm , and the electron temperature of the layer 1 F TT  . In spite of an order of magnitude increase in energy transfer rate values, again the DLG system shows the same behavior as the double-layer 2DEG system; by increasing the distance between two layers, the rate of energy transfer from the higher temperature layer to the lower temperature one decreases.…”

Section: Resultsmentioning

confidence: 99%

“…In general, the energy transfer rate in a DLG system shows the same behavior as the double-layer 2DEG but exhibits an order of magnitude larger values. We also study the change of 12 P by altering the substrate dielectric constant.…”

Section: Resultsmentioning

confidence: 99%

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Energy transfer rate in double-layer graphene systems: Linear regime

Bahrami

Vazifehshenas

2012

Physics Letters A

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We investigate theoretically the energy transfer phenomenon in a double-layer graphene (DLG) system in which two layers are coupled due to the Coulomb interlayer interaction without appreciable interlayer tunneling. We use the balance equation approach and the dynamic and temperature dependent random phase approximation (RPA) screening function in our calculations to obtain the rates of energy transfer between two graphene layers at different layer electron temperatures, densities and interlayer spacings and compare the results with those calculated for the conventional doublelayer two-dimensional electron gas (2DEG) systems. In addition, we study the effect of changing substrate dielectric constant on the rate of energy transfer. The general behavior of the energy transfer rate in the DLG is qualitatively similar to that obtained in the double-layer 2DEG but quantitatively its DLG values are an order of magnitude greater. Also, at large electron temperature differences between two layers, the electron density dependence of the energy transfer for the DLG system is significantly different from that found for the double-layer 2DEG system, particularly in case of unequal layer electron densities.2

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Energy transfer rate in double-layer graphene systems: Linear regime

Bahrami

Vazifehshenas

2012

Physics Letters A

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“…Due to chirality of graphene carriers, the plasmons in MLG and BLG exhibit significantly different from those of ordinary two‐dimensional electron gas (2DEG) . Plasmon dispersion in double‐layer systems was revealed to be considerably different from the single layer ones . It was shown recently that plasmon modes in MLG–2DEG and BLG–2DEG heterostructures even have more interesting properties due to linear electron energy dispersion and chiral character of graphene carriers.…”

Section: Introductionmentioning

confidence: 99%

Plasmon Modes in Bilayer–Monolayer Graphene Heterostructures

Nguyen

Men

2018

Physica Status Solidi (b)

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We investigate the dispersion relation and damping of plasmon modes in a bilayer–monolayer graphene heterostructure with carrier densities nBLG and nMLG at zero temperature within the random‐phase‐approximation taking into account the nonhomogeneity of the dielectric background of the system. We derive analytical expressions for plasmon frequencies by using long wavelength expansion of response and bare Coulomb interaction functions. We show that the optical plasmon dispersion curve of the bilayer–monolayer system lies slightly below that of double‐layer graphene (DLG) and the acoustic one lies much lower than that of DLG. We find that while decay rates of acoustic modes of the system and DLG are remarkably different, those of optical modes in both double‐layer systems are similar. Except the damping rate of acoustic mode, the properties of plasmon excitations in the considered system depend remarkably on the interlayer distance, inhomogeneity of the background, density ratio nMLG/nBLG and spacer dielectric constant, especially at large wave‐vectors.

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“…Therefore, even at low temperatures the energy scales of the plasmons can be comparable to the temperature. Thus, the zero temperature formalism may not give the correct description of these systems, and the finite temperature formalism is necessary, as has been recognized in a number of recent publications [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Excitation spectrum of TTF-TCNQ: a finite temperature calculation

Lošić

2013

Open Physics

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Abstract:In this paper we study the excitation spectrum of the organic conductor tetrathiafulvalenetetracyanoquinodimethane (TTF-TCNQ) using finite temperature calculations. The effect of electronelectron interaction is considered within the random phase approximation (RPA). Our results show the temperature dependent plasmon and dipolar mode corresponding qualitatively to the modes obtained previously using zero temperature formalism assigned to the observed excitations at 10 meV and 0.75 eV. These modes have an essential influence on the energy-loss function. The obtained results are in good qualitative agreement with the optical and EELS data of TTF-TCNQ.

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Temperature effect on plasmon dispersions in double-layer graphene systems

Cited by 57 publications

References 18 publications

Energy transfer rate in double-layer graphene systems: Linear regime

Energy transfer rate in double-layer graphene systems: Linear regime

Plasmon Modes in Bilayer–Monolayer Graphene Heterostructures

Excitation spectrum of TTF-TCNQ: a finite temperature calculation

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