Three-photon spectroscopy of excitons and polaritons in alkali halides

Beerwerth, F.; Fröhlich, D.; Köhler, P.; Leinweber, V.; Voß, Andreas

doi:10.1103/physrevb.38.4250

Cited by 44 publications

(28 citation statements)

References 35 publications

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“…At zero pressure the actual level scheme of the (exciton-) polariton energies has been mapped out at 1. eV. Beyond the states of Γ 4 -symmetry a weak feature was observed at 7.136 eV with circularly polarized light, which was attributed to a state of Γ 5 -symmetry [26].…”

Section: Introductionmentioning

confidence: 92%

Band-structure parameters and Fermi resonances of exciton-polaritons in CsI and CsBr under hydrostatic pressure

et al. 2006

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Most alkali halides crystallize in the fcc sodium chloride structure. In contrast, with the exception of CsF, the Cs-halides form the simple cubic cesium chloride (CsCl) structure at ambient conditions and they have a substantially different electronic structure than other alkali halides; in particular, they have several nearly degenerate electronic levels near the Brillouin zone center. Highly resolved Three-Photon Spectroscopy (TPS) measurements allow direct observation of the near band edge structure and, in the case of CsI, probe more states than one-photon techniques. A number of interesting phenomena, among them level repulsion (Fermi resonance), occur as these levels are tuned through one another by application of hydrostatic pressure. To the best of our knowledge, this has been

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Section: Introductionmentioning

confidence: 92%

Band-structure parameters and Fermi resonances of exciton-polaritons in CsI and CsBr under hydrostatic pressure

et al. 2006

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“…Its splitting in a magnetic field is clearly resolved. Narrow lines of r; symmetry are seen also in K I [6] and RhI [7]. The simukaneous observation of broad and narrow exciton lines in alkali halides is not yet understood.…”

Section: Introductionmentioning

confidence: 90%

Temperature Dependence of Exciton Linewidth in CsI and CsBr

Beerwerth

Fröhlich

Leinweber

1988

Physica Status Solidi (b)

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The temperature dependence of the linewidth of the lowest two r; excitons in Csl and in CsBr and of a very narrow I ? ; exciton in CsI is reported. All spectra are measured by three-photon spectroscopy. The analysis of the experimental results allows conclusions about the decay mechanism of excitons in alkali halides. The temperature dependent broadening is quantitatively described by taking into account exciton-phonon interaction.Die Temperaturabhiingigkeit der Linienbreiten der beiden niederenergetischen r;-Exzitonen in CsI und CsBr und eines sehr schmalen r;-Exzitons in CsI wird untersucht. Alle Spektren werden mit der Methode der Dreiphotonenspektroskopie ausgemessen. Die Auswertung der experimentellen Resultate erlaubt Ruckschliisse auf den Zerfdlsmechanismus der Exzitonen in Alkalihalogeniden.Unter Einbeziehung der Exziton-Phonon-Wechselwirkung kann die temperaturabhiingige Linienverbreiterung quantitativ beschrieben werden.

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“…This paper represents an attempt to mitigate some of the problems by using nonlinear optical (multiphoton) excitation of a solid at high pressure. We report direct measurements of the pressure dependence of the energetically lowest polariton in KI via the three-photon-spectroscopy (TPS) method recently introduced and extensively used by Frohlich and co-workers in a series of detailed investigations of alkali halides [5][6][7].…”

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confidence: 99%

“…This method can directly determine the dispersion relation of the upper polariton branch [5,6]. Three polaritons can fuse nonlinearly to form a polariton of total energy E and a total wave vector of either 3A: or A; where the latter arises through the reflection of one E/3 polariton at the far side of the KI crystal [6] or the rear window of the pressure cell.…”

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confidence: 99%

“…Three polaritons can fuse nonlinearly to form a polariton of total energy E and a total wave vector of either 3A: or A; where the latter arises through the reflection of one E/3 polariton at the far side of the KI crystal [6] or the rear window of the pressure cell. We report measurements of the pressure dependence of energy, linewidth, and curvature parameter of the upper polariton branch for wave vectors k near the center of the Brillouin zone.…”

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confidence: 99%

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Electronic structure measurements in KI at high pressure using three-photon spectroscopy

Lipp

1991

Phys. Rev. Lett.

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This work is the first report of the use of nonlinear optics techniques to probe the pressure dependence of electronic energy levels in a solid. An advantage which may be significant is that for the multiphoton processes involved, relatively low-energy photons that are not absorbed by the cell windows can probe states having energies which would be strongly absorbed by the windows in a one-photon excitation. The measurements follow the pressure dependence of the energetically lowest polariton in KI using the three-photon-spectroscopy method.

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Three-photon spectroscopy of excitons and polaritons in alkali halides

Cited by 44 publications

References 35 publications

Band-structure parameters and Fermi resonances of exciton-polaritons in CsI and CsBr under hydrostatic pressure

Band-structure parameters and Fermi resonances of exciton-polaritons in CsI and CsBr under hydrostatic pressure

Temperature Dependence of Exciton Linewidth in CsI and CsBr

Electronic structure measurements in KI at high pressure using three-photon spectroscopy

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