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4 papers · 2 filters
How to distinguish squeezed and coherent phonons in femtosecond x-ray diffuse scattering
T. Henighan, M. Trigo, M. Chollet +9
Impulsive optical excitation can generate both coherent and squeezed phonons. The expectation value of the phonon displacement oscillates at the mode frequency for the cohe…
Al4SiC4 würtzite crystal: structural, optoelectronic, elastic and piezoelectric properties
L. Pedesseau, J. Even, M. Modreanu +3
New experimental results supported by theoretical analyses are proposed for aluminum silicon carbide (Al4SiC4). A state of the art implementation of the Density Functional Theory i…
Evaluation of defect density by top-view large scale AFM on metamorphic structures grown by MOVPE
Agnieszka Gocalinska, Marina Manganaro, Valeria Dimastrodonato +1
We demonstrate an atomic force microscopy based method for estimation of defect density by identification of threading dislocations on a non-flat surface resulting from metamorphic…
Origin of non-linear piezoelectricity in III-V semiconductors: Internal strain and bond ionicity from hybrid-functional density functional theory
Miguel A. Caro, Stefan Schulz, Eoin P. O'Reilly
We derive first- and second-order piezoelectric coefficients for the zinc-blende III-V semiconductors, {Al,Ga,In}-{N,P,As,Sb}. The results are obtained within the Heyd-Scuseria-Ern…