Abstract
The large optical contrast between crystalline and amorphous phases of phase change memory materials is shown to arise from a large increase in the optical matrix elements which occurs when resonant bonding is present. Resonance requires aligned p orbitals, and is lost in the amorphous phases, irrespective of coordination number. Transitions in resonance can be engineered by superlattice structures. KGaA, Weinheim.
Original language | English |
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Pages (from-to) | 1867-1873 |
Number of pages | 7 |
Journal | Physica Status Solidi (B) Basic Research |
Volume | 249 |
Issue number | 10 |
DOIs | |
Publication status | Published - 1 Oct 2012 |
Externally published | Yes |
Keywords
- Amorphous chalcogenides
- Electronic structure
- Modelling
- Phase change materials
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics