title: Negative capacitance in a ferroelectric capacitor.
abstract: The Boltzmann distribution of electrons poses a fundamental barrier to lowering energy dissipation in conventional electronics, often termed as Boltzmann Tyranny. Negative capacitance in ferroelectric materials, which stems from the stored energy of a phase transition, could provide a solution, but a direct measurement of negative capacitance has so far been elusive. Here, we report the observation of negative capacitance in a thin, epitaxial ferroelectric film. When a voltage pulse is applied, the voltage across the ferroelectric capacitor is found to be decreasing with time--in exactly the opposite direction to which voltage for a regular capacitor should change. Analysis of this 'inductance'-like behaviour from a capacitor presents an unprecedented insight into the intrinsic energy profile of the ferroelectric material and could pave the way for completely new applications.
authors.affiliation: Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA.
authors.forename: Asif Islam
authors.initials: AI
authors.lastname: Khan
authors.affiliation: Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA.
authors.forename: Korok
authors.initials: K
authors.lastname: Chatterjee
authors.affiliation: Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA.
authors.forename: Brian
authors.initials: B
authors.lastname: Wang
authors.affiliation: Department of Physics, University of California, Berkeley, California 94270, USA.
authors.forename: Steven
authors.initials: S
authors.lastname: Drapcho
authors.affiliation: Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA.
authors.forename: Long
authors.initials: L
authors.lastname: You
authors.affiliation: Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA.
authors.forename: Claudy
authors.initials: C
authors.lastname: Serrao
authors.affiliation: Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA.
authors.forename: Saidur Rahman
authors.initials: SR
authors.lastname: Bakaul
authors.affiliation: 1] Department of Physics, University of California, Berkeley, California 94270, USA [2] Department of Material Science and Engineering, University of California, Berkeley, California 94270, USA [3] Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94270, USA.
authors.forename: Ramamoorthy
authors.initials: R
authors.lastname: Ramesh
authors.affiliation: 1] Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA [2] Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94270, USA.
authors.forename: Sayeef
authors.initials: S
authors.lastname: Salahuddin