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Origin of the Optical Contrast in Phase-Change Materials
Abstract
Several chalcogenide alloys exhibit a pronounced contrast between the optical absorption in the metastable rocksalt and in the amorphous phase. This phenomenon is the basis for their application in optical data storage. Here we present ab initio calculations of the optical properties of GeTe and Ge1Sb2Te4 in the two phases. The analysis of our computations and experimental data reveal the correlation between local structural changes and optical properties as well as the origin of the optical contrast in these materials. We find that the change in optical properties cannot be attributed to a smearing of transition energies as commonly assumed for amorphous semiconductors: the optical contrast between the two phases can only be explained by significant changes in the transition matrix elements.
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Citations
Cites
Electronic excitations: density-functional versus many-body Green’s-function approaches
Onida, G., Reining, L., & Rubio, A. (2002) · Reviews of Modern Physics · doi:10.1103/revmodphys.74.601 · Cited by 4,155
Self-citation
Cited by
Phase Change Materials and Their Application to Nonvolatile Memories
Raoux, S., Wełnic, W., & Ielmini, D. (2010) · Chemical Reviews · doi:10.1021/cr900040x · Cited by 873
Self-citationThe role of local structure in dynamical arrest
Royall, C. P., & Williams, S. R. (2015) · Physics Reports · doi:10.1016/j.physrep.2014.11.004 · Cited by 473
Metadata
- Authors
- Wełnic, W., Botti, S., Reining, L., & Wuttig, M.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2007-06-06
- Volume
- 98
- Issue
- 23
- Pages
- 236403-236403
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2077156654
- Cited by
- 186
- References
- 1
- FWCI
- 9.14
- Type
- journal article
- Language
- en
- Open access
- closed
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- Wełnic, W., Botti, S., Reining, L., & Wuttig, M. (2007). Origin of the Optical Contrast in Phase-Change Materials. Physical Review Letters. https://doi.org/10.1103/physrevlett.98.236403
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