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- W1818552634 abstract "This work reports two‐dimensionality of band‐gap exciton in layered ferroelectric TlInS 2 , accessed by spectroscopic phase modulated ellipsometry in a wide range of temperatures embracing normal, incommensurate, and commensurate phases of this material. A significant decrease in exciton binding energy is observed upon approaching the temperature region of the incommensurate phase on cooling or heating. The effective static rather than optic dielectric screening is shown to be responsible for the observed behavior of exciton binding energy that remains larger than the energy of the longitudinal‐optical phonon at all accessed temperatures. The temperature dependence of this screening is remarkable in that it obeys Currie–Weiss law. The values of the exciton's reduced mass and three‐dimensional effective Bohr radius are obtained. The former keeps constant to be 0.928 the mass of the free electron while the latter irregularly changes with temperature, remaining within 14–19 Å limits. The last values correspond to the doubled thickness of a single layer." @default.
- W1818552634 created "2016-06-24" @default.
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- W1818552634 date "2015-04-17" @default.
- W1818552634 modified "2023-10-06" @default.
- W1818552634 title "Band gap exciton in ferroelectric TlInS<sub>2</sub> : Dimensionality and screening" @default.
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- W1818552634 doi "https://doi.org/10.1002/pssb.201400334" @default.
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