Plasmon dissipation in gapped graphene open systems at finite temperature

Iurov, Andrii; Gumbs, Godfrey; Huang, Danhong; Silkin, Viatcheslav M.

doi:10.1103/physrevb.93.035404

Cited by 32 publications

(38 citation statements)

References 60 publications

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“…Iurov et al [44] have found non-linear(T, |ߜ|) dependence of the damping rates. As already mentioned, the emerging trend is to look for the signature of the mechanical strain on the charge and the spin related properties of the fermions as mentioned above.…”

Section: ሺ31ሻmentioning

confidence: 99%

“…One may obtain the finite-temperature counterpart following Iurov et al [44]. We, however, wish to analyze the simpler expression (43) …”

Section: ሺ31ሻmentioning

confidence: 99%

“…This is also referred to as the Landau damping. The long-wavelength limit polarization for the system under consideration has been exhaustively investigated recently by Iurov et al [44] at the finite-temperature. We find that in the case of the strained system, for example, the plasmon frequency in the long wave-length limit (and for the massive fermions) will be given by…”

Section: ሺ31ሻmentioning

confidence: 99%

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Fermions on the low-buckled honey-comb structured lattice plane and classical Casimir–Polder force

Goswami

2016

Int. J. Mod. Phys. B

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We start with the well-known expression for the vacuum polarization and suitably modify it for 2+1 dimensional spin-orbit coupled (SOC) fermions on the low-buckled honey-comb structured lattice plane described by the low-energy Liu-Yao-Feng-Ezawa (LYFE)Model Hamiltonian involving the Dirac matrices in the chiral representation obeying the Clifford algebra. The silicene and germanene fit this description suitably. They have the Dirac cones similar to those of graphene and SOC is much stronger. The system could be normal or ferro-magnetic in nature. The silicene turns into the latter type if there is exchange field arising due to the proximity coupling to a ferro-magnet such as depositing Fe atoms to the silicene surface. For the silicene, we find that the many-body effects considerably change the bare Coulomb potential by way of the dependence of the Coulomb propagator on the real-spin, iso-spin, and the potential due to an electric field applied perpendicular to the silicene plane. The computation aspect of the Casimir-Polder force needs to be investigated in this paper. An important quantity in this process is the dielectric response function (DRF)of the material. The plasmon branch was obtained by finding the zeros of DRF in the long wave-length. limit. This leads to the plasmon frequencies. We find that the collective charge excitations at zero doping, i.e., intrinsic plasmons, in this system, are absent in the Dirac limit. The valley-spin-split intrinsic plasmons, however, come into being in the case of the massive Dirac particles with characteristic frequency close to 10 THz. Our scheme to calculate the Casimir-Polder interaction (CPI) of a micro-particle with a sheet involves replacing the dielectric constant of the sample in the CPI expression obtained on the basis of the Lifshitz theory by the static DRF obtained using the expressions for the polarization function we started with. Though the approach replaces a macroscopic constant by a microscopic quantity, it has the distinct advantage of the many-body effect inclusion seamlessly. We find the result that the for non-trivial susceptibility and polarizability values of the sheet and micro-particle , respectively, there is crossover between attractive and repulsive behavior . The transition depends only on these response functions apart from the ratio of the film thickness and the micro-particle separation (D/d) and temperature. Furthermore, there is a longitudinal electric field induced topological insulator(TI) to spin-valley polarized metal (SVPM) transition in silicene, which is also referred to as the topological phase transition (TPT). The low-energy SVP carriers at TPT possess gap-less (mass-less) and gapped (massive) energy spectra close to the two nodal points in the Brillouin zone with maximum spin-polarization. We find that the magnitude of the Casimir-Polder force at a given ratio of the film thickness and the separation between the micro-particle and the film is greater at TPT than at the topological insulator and trivial insulator ph...

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Section: ሺ31ሻmentioning

confidence: 99%

“…One may obtain the finite-temperature counterpart following Iurov et al [44]. We, however, wish to analyze the simpler expression (43) …”

Section: ሺ31ሻmentioning

confidence: 99%

Section: ሺ31ሻmentioning

confidence: 99%

See 1 more Smart Citation

Fermions on the low-buckled honey-comb structured lattice plane and classical Casimir–Polder force

Goswami

2016

Int. J. Mod. Phys. B

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“…The answer to this lies in the induced optical-polarization field as a collection of local dipole moments from many displaced electrons and holes [3,4], which plays a role in scattering the electric-field component of the incident light [5,6]. Therefore, the quantum nature of Dirac electrons [7][8][9][10][11] is expected to be retained in the effects of optical polarization on the incident light with a complex distribution of the Landau-damping regions in comparison with that for two-dimensional electron gases in a quantum well [12].…”

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confidence: 99%

Effects of optical polarization on hybridization of radiative and evanescent field modes

et al. 2017

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Effects of induced optical polarization by Dirac electrons in graphene on the hybridization of radiative and evanescent fields is found. Such effects result in a localized polarization field which significantly modifies an incident surface-plasmon-polariton (SPP) field. This yields a high sensitivity to local dielectric environments and provides an investigative tool for molecules or proteins selectively bound with carbons. A scattering matrix is utilized with varied frequencies in the vicinity of the surface-plasmon (SP) resonance for the increase, decrease and even a full suppression of the polarization field, which enables accurate effective-medium theories to be constructed for Maxwellequation finite-difference time-domain methods. Moreover, double peaks in the absorption spectra for hybrid SP and graphene-plasmon modes are significant only with a large conductor plasma frequency, but are overshadowed by a round SPP peak at a small plasma frequency as the graphene is placed close to conductor surface. These resonant absorptions facilitate the polariton-only excitations, leading to polariton condensation for a threshold-free laser.

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“…68,[73][74][75][76] Furthermore, our previous work studied the plasmon instability in the graphene double-layer system, predicting an instability-based terahertz emission, 77 and nonlocal plasmons in a metal-graphene-metal encapsulated structure.…”

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confidence: 99%

Controlling plasmon modes and damping in buckled two-dimensional material open systems

Iurov

Gumbs

Huang

et al. 2017

Journal of Applied Physics

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Full ranges of both hybrid plasmon-mode dispersions and their damping are studied systematically by our recently developed mean-field theory in open systems involving a conducting substrate and a two-dimensional (2D) material with a buckled honeycomb lattice, such as silicene, germanene, and a group IV dichalcogenide as well. In this hybrid system, the single plasmon mode for a free-standing 2D layer is split into one acoustic-like and one optical-like mode, leading to a dramatic change in the damping of plasmon modes. In comparison with gapped graphene, critical features associated with plasmon modes and damping in silicene and molybdenum disulfide are found with various spin-orbit and lattice asymmetry energy bandgaps, doping types and levels, and coupling strengths between 2D materials and the conducting substrate. The obtained damping dependence on both spin and valley degrees of freedom is expected to facilitate measuring the open-system dielectric property and the spin-orbit coupling strength of individual 2D materials. The unique linear dispersion of the acoustic-like plasmon mode introduces additional damping from the intraband particle-hole modes which is absent for a free-standing 2D material layer, and the use of molybdenum disulfide with a large bandgap simultaneously suppresses the strong damping from the interband particle-hole modes.

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Plasmon dissipation in gapped graphene open systems at finite temperature

Cited by 32 publications

References 60 publications

Fermions on the low-buckled honey-comb structured lattice plane and classical Casimir–Polder force

Fermions on the low-buckled honey-comb structured lattice plane and classical Casimir–Polder force

Effects of optical polarization on hybridization of radiative and evanescent field modes

Controlling plasmon modes and damping in buckled two-dimensional material open systems

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