Strain control of layer-resolved negative capacitance in superlattices  

作　　者：Raymond Walter Sergey Prosandeev Charles Paillard L.Bellaiche 

机构地区：[1]Department of Physics and Institute for Nanoscience and Engineering,University of Arkansas,Fayetteville,AR 72701,USA [2]Department of Mathematical Sciences,University of Arkansas,Fayetteville,AR 72701,USA [3]Identity Engineering,Kinesso LLC,Conway,AR 72032,USA [4]Institute of Physics and Physics Department of Southern Federal University,Rostov-na-Donu 344090,Russia [5]Laboratoire Structures,Propriétés et Modélisation des Solides,CentraleSupélec,UMR CNRS 8580,UniversitéParis-Saclay,91190 Gif-sur-Yvette,France

出　　处：《npj Computational Materials》2020年第1期127-130,共4页计算材料学（英文）

基　　金：R.W.and L.B.acknowledge ARO Grant No.W911NF-16-1-0227;C.P.and L.B.thank the DARPA Grant No.HR0011-15-2-0038(MATRIX program);S.P.and L.B.also acknowledge ONR Grant No.N00014-17-1-2818;Some computations were made possible by MRI Grant No.0722625 from NSF,ONR Grant No.N00014-15-1-2881(DURIP);a Challenge grant from the Department of Defense;C.P.also acknowledges the support from a public grant overseen by the French National Research Agency(ANR)as part of the“Investissements d’Avenir”program(Labex NanoSaclay,reference:ANR-10-LABX-0035);S.P.appreciates support of the Russian Ministry of Science and Higher Education(State assignment in the field of scientific activity,Southern Federal University,2020).

摘　　要：Negative capacitance in BaTiO_(3)/SrTiO_(3) superlattices is investigated by Monte Carlo simulations in an atomistic effective Hamiltonian model,using fluctuation formulas for responses to the local macroscopic field that incorporates depolarizing fields.We show that epitaxial strain can tune the negative capacitance of the BaTiO_(3) ferroelectric layer and the overall capacitance of the system.In addition,we predict and explain an original switching of the negative capacitance from the BaTiO3 layer to the SrTiO_(3) layer at low temperatures for intermediate strains.

关 键 词：CAPACITANCE LAYER RESOLVED 

分 类 号：TN30[电子电信—物理电子学]