Energy landscape and photoinduced structural changes in chalcogenide glasses

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

It is shown that the magnitude of photostructural changes in chalcogenide glass is a function of the connectivity and fragility of the glass network. Glasses with a floppy network undergo larger photostructural changes, as shown by photorelaxation, photoexpansion and photodarkening measurements. The increasing magnitude of the changes correlates with a decrease in coordination number . The phenomenon is linked to the topography of the energy landscape and to the fragility of samples with different values. Since a high density of minima on the landscape is generally associated with a floppy network and fragile glassformers, it is suggested that photoexcitation provides a means for the system to explore these minima and that, consequently, fragile systems exhibit far larger photostructural changes, as observed. On the other hand, strong systems with optimal rigidity undergo very little structural change upon irradiation. This is attributed to the low density of configurational states on the landscape. A parallel between individual bond breaking in the bond lattice model and individual photoexcitation of bonding electrons during irradiation is made to support the use of the landscape formalism in describing photostructural changes.

Original languageEnglish (US)
Article number005
Pages (from-to)5629-5638
Number of pages10
JournalJournal of Physics Condensed Matter
Volume18
Issue number24
DOIs
StatePublished - Jun 21 2006

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Photoexcitation
Glass
glass
photoexcitation
Photochromism
Electron irradiation
Rigidity
Topography
energy
electron irradiation
coordination number
rigidity
Irradiation
topography
formalism
irradiation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Energy landscape and photoinduced structural changes in chalcogenide glasses. / Lucas, Pierre.

In: Journal of Physics Condensed Matter, Vol. 18, No. 24, 005, 21.06.2006, p. 5629-5638.

Research output: Contribution to journalArticle

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