Ab-initio calculations and structural studies of (SiTe)2(Sb2Te3)n (n: 1, 2, 4 and 6) phase-change superlattice films

Y. Saito, J. Tominaga, P. Fons, A. V. Kolobov, T. Nakano

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

(SiTe)2(Sb2Te3)n phase-change superlattices were investigated theoretically and experimentally. Ab-initio first principle simulations predicted that the (SiTe)2(Sb2Te3)n structures are stable and possess a Dirac semimetal-like band structure. Calculation of the Z2 invariant indicated that the structure was topologically nontrivial. (SiTe)2(Sb2Te3)n superlattice structures derived from first-principles were successfully fabricated on a Si substrate by RF-magnetron sputtering. XRD and TEM indicated that the superlattice films were highly oriented with the 00X planes of Sb2Te3 and the superlattice normal to the substrate surface. The (SiTe)2(Sb2Te3)n superlattice is suggested as new material system for interfacial phase-change memory applications.

Original languageEnglish
Pages (from-to)302-306
Number of pages5
JournalPhysica Status Solidi - Rapid Research Letters
Volume8
Issue number4
DOIs
Publication statusPublished - 2014 Apr

Keywords

  • Density-functional theory
  • Interfaces
  • Phase-change materials
  • Superlattices
  • Tellurides
  • Topological insulators

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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