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

Lipp, M. J.; Wb, Daniels

doi:10.1103/physrevlett.67.2810

Cited by 19 publications

(4 citation statements)

References 21 publications

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“…For the density dependence of the exciton energy E x , a value of ␥ x ϭ 1 3 can be assumed. 47,53,54 For the density dependence of E c the assumption about the density dependence of the bandwidths ␥ B ϭ1 gives ␥ c ϭ1Ϫ2E x0 /(3E c0 ). There is only little information about ␥ d .…”

Section: Density Dependence Of the Refractive Indexmentioning

confidence: 99%

Refractive index of the alkali halides.mI. Constant joint density of states model

Johannsen

1997

Phys. Rev. B

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The electronic contribution to the imaginary part of the dielectric function of the alkali halides is assumed to be proportional to E Ϫ2 above the onset of optical absorption, which is equivalent to the assumption of a constant joint density of states ͑CJDOS͒ model. In this approach the electronic contribution to the refractive index can be described by two parameters, the long-wavelength limit of the refractive index n ϱ and the frequency of the onset of optical absorption E x0 . Various fits of the corresponding model function to experimental dispersion data show that E x0 is closely related to the frequency of the lowest exciton. Exciton absorption and interband transitions from the p valence bands to s and d conduction bands make the main contributions to the imaginary part of the dielectric function. The relative shifts of the s and d bands with respect to the p bands with density have different signs, and make different contributions to the photoelastic behavior. The CJDOS model is extended to account for the different behavior of s and d bands, and it is shown that the available literature data for the density dependence of the refractive index can be related to the energies of the s and d bands, derived from optical spectra and band-structure calculations. Shock data for LiF and NaCl are discussed, as well as low-pressure results for KCl, KBr, and KI. Recent high-pressure results for CsI show a strong nonlinear density dependence of the refractive index, in contrast to the almost linear behavior of the lighter alkali halides. Within the CJDOS model, this nonlinear behavior can be related to the closure of the band gap in CsI. ͓S0163-1829͑97͒06011-6͔

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Section: Density Dependence Of the Refractive Indexmentioning

confidence: 99%

Refractive index of the alkali halides.mI. Constant joint density of states model

Johannsen

1997

Phys. Rev. B

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“…Since then a huge amount of data has beeen accumulated [4]. What is the reason to use another technique, namely twophoton spectroscopy (or three-photon spectroscopy in the case of alkali halides [ 5 ] ) , to measure this pressure dependence again?…”

Section: Introductionmentioning

confidence: 99%

Determination of the Pressure Dependence of Band‐Structure Parameters by Two‐Photon Spectroscopy

Reimann

Haselhoff

Rübenacke

et al. 1996

Physica Status Solidi (b)

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Two-photon spectroscopy has been used to determine the pressure dependence of band-structure parameters such as band gap, exciton binding energy, biexciton binding energy, exchange energy, and Luttinger parameters. Compared to linear spectroscopy it yields not only a higher precision, but is often able to determine a larger number of parameters. Results are presented for ZnTe and CuCl nanocrystals in a LiCl matrix.

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“…More details about the method and experiment can be found in Ref. [21]. The resonances were detected through the luminescence of the self-trapped exciton (STE) state at 3.7 eV [22].…”

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confidence: 99%

Linewidth Collapse in Three-Photon Exciton-Polariton Spectra of CsI under Pressure

et al. 2000

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Unusual phenomena occurring under hydrostatic compression in the near-band-edge structure of CsI crystals were examined using the nonlinear optical technique of three-photon excitation. The lowest one-photon allowed transition to the exciton-polariton A of gamma-4 symmetry redshifts, while the one-photon forbidden paraexciton C of gamma-5 symmetry blueshifts to a crossing of energies at 4.4 kbar. During this process, the A level exhibits strong spectral line narrowing by more than a factor of 10, while the C level intensity increases by about the same factor. We believe this is the first reported observation of pressure induced line narrowing of deep UV electronic states in solids.

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

Cited by 19 publications

References 21 publications

Refractive index of the alkali halides.mI. Constant joint density of states model

Refractive index of the alkali halides.mI. Constant joint density of states model

Determination of the Pressure Dependence of Band‐Structure Parameters by Two‐Photon Spectroscopy

Linewidth Collapse in Three-Photon Exciton-Polariton Spectra of CsI under Pressure

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