Electronic correlations in solids, studied using electron energy-loss spectroscopy

Fink, J.; Knupfer, M.; Atzkern, S.; Golden, M. S.

doi:10.1016/s0368-2048(01)00254-7

Cited by 44 publications

(35 citation statements)

References 78 publications

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“…[21] The EELS cross section is basically proportional to Im[-1/ (ω, q)] (called loss function) where (ω, q) = 1 (ω, q) + i 2 (ω, q) is the momentum and energy-dependent complex dielectric function. In this way, EELS probes the electronic excitations of a solid under investigation.…”

Section: Introductionmentioning

confidence: 99%

Plasmons and interband transitions ofCa11Sr3Cu24O41
Roth
¹
,
Heß
²
,
Büchner
³

et al. 2010
Phys. Rev. B
9
1
8
0
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Electron energy-loss spectroscopy studies have been performed in order to get a deeper insight into the electronic structure and elementary excitations of the two -leg ladder system Ca 11 Sr 3 Cu 24 O 41 . We find a strong anisotropy of the loss function for momentum transfers along the a and c -crystallographic axis, and a remarkable linear plasmon dispersion for a momentum transfer parallel to the legs of the ladders. The investigated spectral features are attributed to localized and delocalized charge-transfer excitations and the charge carrier plasmon. The charge carrier plasmon position and dispersion in the long wave-length limit agree well with expectations based upon the band structure of the two-leg ladder, while the observed quasi-linear plasmon dispersion might be related to the peculiar properties of underdoped cuprates in general.

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Section: Introductionmentioning

confidence: 99%

Plasmons and interband transitions ofCa11Sr3Cu24O41
Roth
¹
,
Heß
²
,
Büchner
³

et al. 2010
Phys. Rev. B
9
1
8
0
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“…It has been successfully applied to investigate collective charge modes in numerous condensed-matter systems (see 11,12 for an overview). Recently, the momentum dependence of excitons in other topical quasi-2D materials like MoS 2 13 and black phosphorus 14 has been successfully investigated with the same methodology.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Nongeneric dispersion of excitons in the bulk ofWSe2

et al. 2016

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We combine electron energy-loss spectroscopy (EELS) and density functional theory (DFT) calculations to study the dispersion and effective mass of excitons in the bulk of WSe2. Our EELS data suggest substantial deviations from the generic quadratic momentum dependence along the ΓK-direction. From the DFT-derived Kohn-Sham states we deduce the EELS response without the inclusion of particle-hole attraction to study the possible role of the single-particle band structure on the exciton behavior. Based on this analysis we argue in favor of a strongly momentum dependent particle-hole interaction in WSe2 and other group VI-transition-metal dichalcogenides.

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“…The intensity distribution of an EELS spectrum is proportional to the negative imaginary part of the reciprocal value of the macroscopic dielectric function, the energyloss function [5][6][7]. Within the present RPA approach this function is nonzero in the region of the electron-hole quasi-continuums and reads…”

Section: Energy-loss Functionmentioning

confidence: 99%

Energy-loss function of TTF-TCNQ

Lošić

2011

Open Physics

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Ê Ú ¾¿ Å Ý ¾¼½½ ÔØ ½¿ ÇØÓ Ö ¾¼½½ ×ØÖ ØWe investigate the energy-loss function for a previously developed model of quasi-one-dimensional metals with two one-dimensional electron bands per donor and acceptor chains and the three-dimensional long-range Coulomb electron-electron interaction within the random phase approximation. It is essentially influenced by two hybridized collective modes which result from the strong coupling of the intraband plasmon and the interband dipolar modes. Our calculations show that the spectral weights of the renormalized plasmon and the dipolar mode dominate within the long wavelength limit, while for large longitudinal wave vectors the intraband electron-hole quasi-continuum gains some experimentally observable spectral weight as the second mode approaches it. The function obtained is brought into correspondence with the data of the quasi-one-dimensional organic conductor tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) obtained from electron energy-loss spectroscopy (EELS) measurements.

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Electronic correlations in solids, studied using electron energy-loss spectroscopy

Cited by 44 publications

References 78 publications

Plasmons and interband transitions ofCa11Sr3Cu24O41
Roth
¹
,
Heß
²
,
Büchner
³

et al. 2010
Phys. Rev. B
9
1
8
0
View full text Add to dashboard Cite

Plasmons and interband transitions ofCa11Sr3Cu24O41
Roth
¹
,
Heß
²
,
Büchner
³

et al. 2010
Phys. Rev. B
9
1
8
0
View full text Add to dashboard Cite

Nongeneric dispersion of excitons in the bulk ofWSe2

Energy-loss function of TTF-TCNQ

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Electronic correlations in solids, studied using electron energy-loss spectroscopy

Cited by 44 publications

References 78 publications

Plasmons and interband transitions ofCa11Sr3Cu24O41Roth1, Heß2, Büchner3 et al. 2010Phys. Rev. B9180View full textAdd to dashboardCite

Plasmons and interband transitions ofCa11Sr3Cu24O41Roth1, Heß2, Büchner3 et al. 2010Phys. Rev. B9180View full textAdd to dashboardCite

Nongeneric dispersion of excitons in the bulk ofWSe2

Energy-loss function of TTF-TCNQ

Contact Info

Product

Resources

About

Plasmons and interband transitions ofCa11Sr3Cu24O41
Roth
¹
,
Heß
²
,
Büchner
³

et al. 2010
Phys. Rev. B
9
1
8
0
View full text Add to dashboard Cite

Plasmons and interband transitions ofCa11Sr3Cu24O41
Roth
¹
,
Heß
²
,
Büchner
³

et al. 2010
Phys. Rev. B
9
1
8
0
View full text Add to dashboard Cite