Plasmon electron–hole resonance in epitaxial graphene

Tegenkamp, Christoph; Pfnür, H.; Länger, Thomas; Baringhaus, Jens; Schumacher, H. W.

doi:10.1088/0953-8984/23/1/012001

Cited by 86 publications

(116 citation statements)

References 40 publications

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“…As we previously saw in Fig. 9(a), the RPA result again has an image potential behavior (25) where Z ≈ 0.87 and z 0 ≈ 2.13 a.u.. The DFT results also exhibit an image potential behavior, and there is little doubt that the Li + ion behaves as a point charge.…”

Section: Ion Self Energysupporting

confidence: 72%

“…Figure 9 shows a comparison between self energies obtained by using the full RPA self energy expression (21) and the image potential (IP) expression of Eq. (25), where the parameters Z and z 0 are obtained from Eqs. (24) and (26).…”

Section: B Core-hole Screeningmentioning

confidence: 99%

“…17 Also, in many applications it is very important to understand how an external longitudinal probe, e.g., an external charge distribution, should be designed in order to both efficiently and selectively excite plasmons in graphene. Even though there are many theoretical [22][23][24] and experimental [25][26][27] investigations of plasmonics and single particle excitations in graphene, a proper theoretical description of the plasmon excitation and decay mechanisms is still lacking.…”

Section: Introductionmentioning

confidence: 99%

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TDDFT study of time-dependent and static screening in graphene

et al. 2012

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Time-dependent density functional theory (TDDFT) within the random phase approximation (RPA) is used to obtain the time evolution of the induced potential produce by the sudden formation of a C 1s core hole inside a graphene monolayer, and to show how the system reaches the equilibrium potential. The characteristic oscillations in the time-dependent screening potential are related to the excitations of π and σ + π plasmons as well as the low energy 2D plasmons in doped graphene. The equilibrium RPA screened potential is compared with the DFT effective potential, yielding good qualitative agreement. The self energy of a point charge near a graphene monolayer is shown to demonstrate an image potential type behavior, Ze/(z − z 0 ), down to very short distances (4 a.u.) above the graphene layer. Both results are found to agree near quantitatively with the DFT ground state energy shift of a Li + ion placed near a graphene monolayer.

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Section: Ion Self Energysupporting

confidence: 72%

Section: B Core-hole Screeningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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TDDFT study of time-dependent and static screening in graphene

et al. 2012

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“…[20][21][22][23][24][25] For these reasons, the study of plasmonics in graphene has received significant attention both experimentally and theoretically. 21,22,[26][27][28][29] Recently, experimental research on graphene has been extended to the fabrication and study of QD-graphene nanostructures. [30][31][32][33][34] For example, a CdS QD-graphene hybrid system has been synthesized by Cao et al, 30 in which a picosecond ultrafast electron transfer process from the excited QD to the graphene matrix was observed using time-resolved fluorescence spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Dipole-dipole interaction between a quantum dot and a graphene nanodisk

et al. 2012

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We study theoretically the dipole-dipole interaction and energy transfer in a hybrid system consisting of a quantum dot and graphene nanodisk embedded in a nonlinear photonic crystal. In our model, a probe laser field is applied to measure the energy transfer between the quantum dot and graphene nanodisk, while a control field manipulates the energy transfer process. These fields create excitons in the quantum dot and surface plasmon polaritons in the graphene nanodisk which interact via the dipole-dipole interaction. Here, the nonlinear photonic crystal acts as a tunable photonic reservoir for the quantum dot, and is used to control the energy transfer. We have found that the spectrum of power absorption in the quantum dot has two peaks due to the creation of two dressed excitons in the presence of the dipole-dipole interaction. The energy transfer rate spectrum of the graphene nanodisk also has two peaks due to the absorption of these two dressed excitons. Additionally, energy transfer between the quantum dot and the graphene nanodisk can be switched on and off by applying a pump laser to the photonic crystal or by adjusting the strength of the dipole-dipole interaction. We show that the intensity and frequencies of the peaks in the energy transfer rate spectra can be modified by changing the number of graphene monolayers in the nanodisk or the separation between the quantum dot and graphene. Our results agree with existing experiments on a qualitative basis. The principle of our system can be employed to fabricate nanobiosensors, optical nanoswitches, and energy transfer devices.

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“…Using currently available subnanometer-sized beam spots, free electrons appear to be a viable solution to create and detect graphene plasmons with large yield and high spatial resolution. As a first step in this direction, angle-resolved EELS performed with low-energy electrons has been used to map the dispersion relation of low-energy graphene plasmons, 27,28 as well as their hybridization with the phonons of a SiC substrate, 29 although this technique has limited spatial resolution.…”

mentioning

confidence: 99%

Even Hard-Sphere Colloidal Suspensions Display Fickian Yet Non-Gaussian Diffusion

2014

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We show that free electrons can efficiently excite plasmons in doped graphene with probabilities of order one per electron. More precisely, we predict multiple excitations of a single confined plasmon mode in graphene nanostructures. These unprecedentedly large electron-plasmon couplings are explained using a simple scaling law and further investigated through a general quantum description of the electron-plasmon interaction. From a fundamental viewpoint, multiple plasmon excitations by a single electron provides a unique tool for exploring the bosonic quantum nature of these collective modes. Our study does not only open a viable path towards multiple excitation of a single plasmon mode by single electrons, but it also reveals graphene nanostructures as ideal systems for producing, detecting, and manipulating plasmons using electron probes.

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Plasmon electron–hole resonance in epitaxial graphene

Cited by 86 publications

References 40 publications

TDDFT study of time-dependent and static screening in graphene

TDDFT study of time-dependent and static screening in graphene

Dipole-dipole interaction between a quantum dot and a graphene nanodisk

Even Hard-Sphere Colloidal Suspensions Display Fickian Yet Non-Gaussian Diffusion

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