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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Thursday, 20 October 2011
(at 13:00 in room 115, Hallwachsstr. 3)
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Finite-size effects in the phonon density of states of nanostructured germanium

Daniel Sopu

Institute for Materials Science
University of Technology Darmstadt

When the characteristic length scales get down to the nanometer regime, the phonon density of states (PDOS) deviates from the corresponding bulk structure. Although deviations of the PDOS from the corresponding bulk structure have been observed both in experiment and theory, still it is not well understood how various size effects change the PDOS. In this talk, I will present our work using molecular dynamic simulations to study the PDOS of different nano-structures like nanoparticles, nanocrystals, embedded nanoparticles and nanoglasses. I will show how the vibrational properties of each the nanostructures deviate significantly from those of single crystalline and bulk amorphous structures. This talk will illustrate a complete description of finite-size effects on the PDOS in terms of disorder, phonon confinement due to the particle, and surface stress.

Brief Bio:

I am originally from Romania. There I studied mathematics and physics at Ovidius University in Constanta and I finished my masters degree in 2006. In 2007 I moved to Technical University of Darmstadt to join Prof. Karsten Albe's group for my PhD to study metallic nanoglasses. In 2011, I received my doctoral degree and I am currently working as a post-doc in the same group.

slides (pdf)

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2021.10.21 Thu
author: webadmin