<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">T. Still</style></author><author><style face="normal" font="default" size="100%">W. Cheng</style></author><author><style face="normal" font="default" size="100%">M. Retsch</style></author><author><style face="normal" font="default" size="100%">R. Sainidou</style></author><author><style face="normal" font="default" size="100%">J.J. Wang</style></author><author><style face="normal" font="default" size="100%">U. Jonas</style></author><author><style face="normal" font="default" size="100%">N. Stefanou</style></author><author><style face="normal" font="default" size="100%">G. Fytas</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Simultaneous occurrence of structure-directed and particle-resonance-induced phononic gaps in colloidal films</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review Letters</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2008</style></year></dates><volume><style face="normal" font="default" size="100%">100</style></volume><pages><style face="normal" font="default" size="100%">194301 (4 pages)</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;We report on the observation of two hypersonic phononic gaps of different nature in three-dimensional colloidal films of nanospheres using Brillouin light scattering. One is a Bragg gap occurring at the edge of the first Brillouin zone along a high-symmetry crystal direction. The other is a hybridization gap in crystalline and amorphous films, originating from the interaction of the band of quadrupole particle eigenmodes with the acoustic effective-medium band, and its frequency position compares well with the computed lowest eigenfrequency. Structural disorder eliminates the Bragg gap, while the hybridization gap is robust.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">19</style></issue></record></records></xml>