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We present an ab initio density functional study of ferroelectricity in single-domain PbTiO 3-based nanoca-pacitors. We used density functional theory with the recently introduced PBEsol generalized-gradient exchange-correlation functional, which we found to give accurate properties of bulk ferroelectric ͑FE͒ materials. Pt and Au electrodes are used in our(More)
We study the zero temperature (Tϭ0) quantum rotor model with on-site disorder in the charging energy. Such a model may serve as an idealized Hamiltonian for an array of Josephson-coupled small superconducting grains or superfluid 4 He in a disordered environment. In the approximation of small-amplitude phase fluctuations , the Hamiltonian maps onto a system(More)
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