138 citations · 625 across the 15 of their papers we have counts for
15 papers
Wave theory of lattice dynamics
Paul Tangney
I present the mathematical structure of classical phonon theory in a general form, which emphasizes the wave natures of phonons, and which can serve as a robust foundation for furt…
Ultrafast polarization switching in BaTiO by photoactivation of its ferroelectric and central modes
Fangyuan Gu, Paul Tangney
We use molecular dynamics simulations with machine-learned atomistic force fields to simulate photoexcitation of BaTiO3 by a femtosecond laser pulse whose photon energy exceeds the…
Derivation of Bose-Einstein statistics from the uncertainty principle
Paul Tangney
The microstate of any degree of freedom of any classical dynamical system can be represented by a point in its two dimensional phase space. Since infinitely precise measurements ar…
Breakdown of phonon band theory in MgO
Gabriele Coiana, Johannes Lischner, Paul Tangney
We present a series of detailed images of the distribution of kinetic energy among frequencies and wavevectors in the bulk of an MgO crystal as it is heated slowly until it melts.…
Fermi level pinning can determine polarity in semiconductor nanorods
Philip W. Avraam, Nicholas D. M. Hine, Paul Tangney +1
First-principles calculations of polar semiconductor nanorods reveal that their dipole moments are strongly influenced by Fermi level pinning. The Fermi level for an isolated nanor…
Factors influencing the distribution of charge in polar nanocrystals
Philip W. Avraam, Nicholas D. M. Hine, Paul Tangney +1
We perform first-principles calculations of wurtzite GaAs nanorods to explore the factors determining charge distributions in polar nanostructures. We show that both the direction…