Acoustical Plasmons, Phonon Anomalies, and Superconductivity in Transition-Metal Systems

Ganguly, B. N.; Wood, R. F.

doi:10.1103/physrevlett.28.681

Cited by 36 publications

(6 citation statements)

References 17 publications

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“…Beyond monolayer transition-metal dichalcogenides, virtual exchange of shortwave plasmons may give rise to pairing mechanisms in superconductors whose Fermi surfaces comprise distinct pockets in the Brillouin zone. Similar to our formalism, plasmon-mediated Cooper pairing can be modeled when a dynamical screening description is employed [87][88][89][90], and it was argued to facilitate superconductivity in cuprate metal oxides [91] and other transition-metal systems through plasmon-phonon hybridization [92,93], as well as in semiconductors and electronhole liquids [94][95][96][97].…”

Section: Discussionmentioning

confidence: 99%

Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides

et al. 2017

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Just as photons are the quanta of light, plasmons are the quanta of orchestrated charge-density oscillations in conducting media. Plasmon phenomena in normal metals, superconductors, and doped semiconductors are often driven by long-wavelength Coulomb interactions. However, in crystals whose Fermi surface is comprised of disconnected pockets in the Brillouin zone, collective electron excitations can also attain a shortwave component when electrons transition between these pockets. In this work, we show that the band structure of monolayer transition-metal dichalcogenides gives rise to an intriguing mechanism through which shortwave plasmons are paired up with excitons. The coupling elucidates the origin for the optical sideband that is observed repeatedly in monolayers of WSe 2 and WS 2 but not understood. The theory makes it clear why exciton-plasmon coupling has the right conditions to manifest itself distinctly only in the optical spectra of electron-doped tungsten-based monolayers.

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Section: Discussionmentioning

confidence: 99%

Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides

et al. 2017

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“…7 The electron-phonon matrix elements which enter a 2 F and A show a significant enhancement at the anomalies due to the resonancelike increase of the p-d screening described by the matrix VS~* in Eq. (5). Since simultaneously the matrix elements increase and the phonon frequencies decrease, we expect a pronounced enhancement of A due to the (p-d) local-field effect.…”

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confidence: 89%

Phonon Anomalies and Superconductivity in Transition-Metal Compounds

1976

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“…Schaefer and von Baltz (1987) have extended the analysis of the transport equations, including a phenomenological term describing impurity scattering. Other theoretical studies of acoustic plasmons are by Chakraborty (1984), Ganguly and Wood (1972), Oliva and Ashcroft (1982), Pashitskii (1969), Rothward (1972, Sinha and Varma (1983) and Vignale andSingwi (1982,1985).…”

Section: Introductionmentioning

confidence: 99%

Acoustic plasmons in two- and three-component degenerate Fermi gases, with application to the gallium arsenide electron-hole plasma

Bennacer

Cottey

1989

J. Phys.: Condens. Matter

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Acoustic plasmons in a two-component degenerate Fermi gas are analysed, using the random-phase approximation dielectric function with exact analytic continuation into the lower half of the complex frequency plane. The acoustic plasmon spectrum, in reduced variables, depends on four parameters-the ratio of Thomas-Fermi screening wavevectors of the two plasmas, the ratio of Fermi velocities, and the densities of the two plasmas. The dependence of the spectrum on these parameters is surveyed. The first two of the abovementioned parameters are the most important. Acoustic plasmons can exist even when the two plasmas have equal effective mass. The range of parameters giving weakly damped acoustic plasmons is described. The spectrum has an abrupt cut-off (maximum wavevector); this corresponds to the onset of Landau damping in both plasmas. The experimental results of Pinczuk, Shah and Wolff on acoustic plasmons in the GaAs electron-hole plasma are reanalysed. For this purpose the extension to a three-component plasma is made, since the light holes, although few in number, have a significant effect on the results. In this system the 'upper acoustic plasmon' does not exist, contrary to what is implicitly assumed by Pinczuk, Shah and Wolff in their analysis. The 'lower acoustic plasmon' does exist, and its phase velocity agrees, within the errors of theory and experiment, with their experimental result.

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Acoustical Plasmons, Phonon Anomalies, and Superconductivity in Transition-Metal Systems

Cited by 36 publications

References 17 publications

Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides

Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides

Phonon Anomalies and Superconductivity in Transition-Metal Compounds

Acoustic plasmons in two- and three-component degenerate Fermi gases, with application to the gallium arsenide electron-hole plasma

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