Abstracts Book - IMRC 2018

• SC6-O019 Invited Talk
THERMAL AND ACOUSTIC PROPERTIES OF NANOSTRUCTURES
Emigdio Chavez Angel 1 , Bart Graczikoski 1 , Marianna Sledzinska 1 , Francesc Alzina 1 , Clivia
Sotomayor Torres 1
1 Institut Català de Nanociéncia i Nanotecnologia, Phononic and Photonic Nanostructure
Group, Spain.
Phonons play an important role in thermal energy transport in semiconductors
and insulators and their study is motivated especially by the need to understand
and control thermal transport in the nanoscale. While there are several
theoretical approaches, the experimental research has only recently taken off
significantly after a slow start. The main reasons have been sample preparation
in a controlled manner and the emergence of novel experimental methods. In
this work, we will provide an overview and examples of thermal transport in
several sample types to illustrate this dynamic and exciting field. From Si [1-2]
and MoS 2 [3] membranes to 2D phononic crystals [4] and half-Heusler
superlattices [5] we will illustrate key concepts and research issues, such as how
the volume-to-surface ratio [6], phononic crystal periodicity, disorder [7] and air
convection [6] impact on thermal phonon propagation.
Reference:
[1] M. Sotomayor Torres et al., Fundamental science and applications, chapter
12 in: Silicon Nanomembranes, J. Roger and J. Ahn (Eds.), Wiley, Berlin, (2016)
305-326.
[2] E. Chavez Angel et al., Appl. Phys. Lett. Materials 2 (2014) 012113.
[3] M. Sledzinska et al., ACS Applied Materials & Interfaces, 9 (2017) 37905.
[4] B. Graczykowski et al., Phys. Rev. B 91 (2015) 075414.
[5] P. Komar et al., APL Materials 4 (2016), 104902.
[6] B. Graczykowski et al., Nature Comms, 8 (2017) 415.
[7] R. Wagner et al, Nano Letters 16 (2016) 5661.
Acknowledgment: ICN2 acknowledges support the Severo Ochoa Program
(MINECO, Grant SEV-2013-0295) and funding the CERCA
Programme/Generalitat de Catalunya. Funding the Spanish Ministry is
acknowledged (PHENTOM, FIS2015-70862-P).
Keywords: Nanoscale thermal properties, Si membranes, Superlattices
Presenting authors email: emigdio.chavez@icn2.cat