Oxygen phonon branches in overdopedLa1.7Sr0.3Cu3O4

Oxygen Phonon Branches in Detwinned YBa2Cu3O7

Forschungszentrum Karlsruhe, Institut für Festkörperphysik, Postfach 3640, D-76021 Karlsruhe, Germany Laboratoire Leon Brillouin, C.E.A./C.N.R.S., F-91191-Gif-sur-Yvette CEDEX, France Institute for Material Research, Tohoku University, Katahira, Aoba-ku, Sendai, 9808577, Japan Physics Department, Brookhaven National Laboratory, Upton, NY 11973 Superconductivity Research Laboratory, ISTEC, Shino...

Direct observation of confined acoustic phonon polarization branches in free-standing semiconductor nanowires

Similar to electron waves, the phonon states in semiconductors can undergo changes induced by external boundaries. However, despite strong scientific and practical importance, conclusive experimental evidence of confined acoustic phonon polarization branches in individual free-standing nanostructures is lacking. Here we report results of Brillouin-Mandelstam light scattering spectroscopy, which...

v 2 [ co nd - m at . s up r - co n ] 1 6 Se p 20 02 Oxygen Phonon Branches in Detwinned YBa

Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface

A high-frequency optical phonon mode of SrTiO3 (STO) was found to assist the high-temperature superconductivity observed recently at the interface between monolayer FeSe and STO substrate. However, the origin of this mode is not clear. Through first-principles calculations, we find that there is a novel polar phonon mode on the surface layers of the STO substrate, which does not exist in the ST...

Theoretical description of thermal transport in graphene: The issues of phonon cut-off frequencies and polarization branches

We discuss theoretical approaches for description of the phonon thermal transport in graphene and identify open questions and problems. Specifically, we show that due to a fundamental ambiguity in the definition of the intrinsic thermal conductivity of two-dimensional (2-D) systems the calculations that use an arbitrary low-bound cut-off for the phonon frequency in the thermal conductivity inte...