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 ...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.展开更多
基金R.W.and L.B.acknowledge ARO Grant No.W911NF-16-1-0227C.P.and L.B.thank the DARPA Grant No.HR0011-15-2-0038(MATRIX program)+4 种基金S.P.and L.B.also acknowledge ONR Grant No.N00014-17-1-2818Some 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 DefenseC.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).
文摘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.
