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

作者：Saito Y^*; Tominaga J; Fons P; Kolobov A V; Nakano T

来源：Physica Status Solidi-Rapid Research Letters, 2014, 8(4): 302-306.

DOI：10.1002/pssr.201409013

• phase-change materials
• interfaces
• topological insulators
• density-functional theory
• superlattices
• tellurides

(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 Z(2) 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.

• 出版日期2014-4