459 citations · 2.3k across the 63 of their papers we have counts for
63 papers
Temperature dependence of the charge density from first principles: application to the (222) forbidden reflection in silicon
Jean Paul Nery, Raveena Gupta, Olle Hellman +2
Forbidden reflections (FRs) in X-ray diffraction have inherently weak intensity and have long been studied, in particular in semiconductors like silicon. They serve as sensitive pr…
Non-local thermal transport modeling using the thermal distributor
Ali Kefayati, Philip B. Allen, Vasili Perebeinos
Thermal transport in a quasi-ballistic regime is determined not only by the local temperature , or its gradient , but also by temperature distribution at neighbo…
Nonlocal Phonon Heat Transport Seen in 1-d Pulses
Philip B. Allen, Nhat Ahn Nghiem Vu
Phonons are the main heat carriers in semiconductor devices. In small devices, heat is not driven by a local temperature gradient, but by local points of heat input and removal. Th…
Phonon Boltzmann equation non-local in space and time: the partial failure of the generalized Fourier law
Philip B. Allen
The purpose of this note is to clarify the solution of the non-local Peierls Boltzmann equation found by Hua and Lindsay (Phys. Rev. B 102, 104310 (2020)). They used methods of Cep…
Accidental Degeneracy in k-space, Geometrical Phase, and the Perturbation of by Spin-orbit Interactions
Philip B. Allen, Warren E. Pickett
Since closed lines of {\it accidental} electronic degeneracies were demonstrated to be possible, even frequent, by Herring in 1937, no further developments arose for eight decades.…
Theory of thermal expansion: Quasi-harmonic approximation and corrections from quasiparticle renormalization
Philip B. Allen
"Quasi-harmonic" (QH) theory should not be considered a low-order theory of anharmonic effects in crystals, but should be recognized as an important effect separate from "true" anh…