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Giant voltage amplification from electrostatically induced incipient ferroelectric states.
Graf, Mónica; Aramberri, Hugo; Zubko, Pavlo; Íñiguez, Jorge.
Afiliação
  • Graf M; Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg.
  • Aramberri H; Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg.
  • Zubko P; London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London, UK.
  • Íñiguez J; Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg. jorge.iniguez@list.lu.
Nat Mater ; 21(11): 1252-1257, 2022 11.
Article em En | MEDLINE | ID: mdl-36008605
ABSTRACT
Ferroelectrics subject to suitable electric boundary conditions present a steady negative capacitance response1,2. When the ferroelectric is in a heterostructure, this behaviour yields a voltage amplification in the other elements, which experience a potential difference larger than the one applied, holding promise for low-power electronics3. So far research has focused on verifying this effect and little is known about how to optimize it. Here, we describe an electrostatic theory of ferroelectric/dielectric superlattices, convenient model systems4,5, and show the relationship between the negative permittivity of the ferroelectric layers and the voltage amplification in the dielectric ones. Then, we run simulations of PbTiO3/SrTiO3 superlattices to reveal the factors most strongly affecting the amplification. In particular, we find that giant effects (up to tenfold increases) can be obtained when PbTiO3 is brought close to the so-called 'incipient ferroelectric' state.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Eletrônica Tipo de estudo: Prognostic_studies Idioma: En Revista: Nat Mater Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Eletrônica Tipo de estudo: Prognostic_studies Idioma: En Revista: Nat Mater Ano de publicação: 2022 Tipo de documento: Article