2.1k citations · 2.3k across the 6 of their papers we have counts for
7 papers
Perturbative Born theory for light scattering by time-modulated scatterers
Dionysios Galanis, Evangelos Almpanis, Nikolaos Papanikolaou +1
We present a theoretical framework for electromagnetic scattering by particles with a permittivity that is periodically varying in time, based on a perturbative approach. Within th…
Photonic time crystals assisted by quasi-bound states in the continuum
P. Garg, E. Almpanis, L. Zimmer +8
Photonic time crystals (PTCs) are characterized by the rapid modulation of the material properties in time, causing a momentum bandgap for light. However, the observation of these…
Designing Si sphere metagratings: From perfect reflection to large-angle diffraction
Evangelos Almpanis, Emmanouil Panagiotidis, Nikolaos Stefanou +1
A thorough theoretical study of the optical properties of periodic Si nanosphere arrays is undertaken, placing particular emphasis on the synergy between electric and magnetic Mie…
A KKR Green function formalism for ballistic transport
Ph. Mavropoulos, N. Papanikolaou, P. H. Dederichs
We develop a method for the calculation of ballistic transport from first principles. The multiple scattering screened Korringa-Kohn-Rostoker (KKR) method is combined with a Green'…
Slater-Pauling Behavior of the Half-Ferromagnetic Full-Heusler Alloys
I. Galanakis, P. H. Dederichs, N. Papanikolaou
Using the full-potential screened Korringa-Kohn-Rostoker method we study the full-Heusler alloys based on Co, Fe, Rh and Ru. We show that many of these compounds show a half-metall…
Evolution of Co/Cu multilayer conductivity during growth: ab intio study
P. Zahn, N. Papanikolaou, F. Erler +1
We present ab-initio calculations for the in plane conductivity of Co/Cu multilayer slabs. The electronic structure of the multilayer slabs is calculated by means of density functi…
Broken-Bond Rule for the Surface Energies of Noble Metals
I. Galanakis, G. Bihlmayer, V. Bellini +4
Using two different full-potential ab-initio techniques we introduce a simple, universal rule based on the number of broken first-neighbor bonds to determine the surface energies o…