Nanophononic devices from intercalated 2D materials
DIPC Seminars
- Speaker
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Davide Donadio, University of California Davis
- When
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2019/06/18
14:00 - Place
- Donostia International Physics Center
- Add to calendar
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iCal
Devices enabling thermal rectification and dynamic control of nanoscale heat
transport would be game changers in nanoelectronics and renewable energy
harvesting. Two-dimensional van der Waals layered materials feature intriguing
thermal transport properties and have been proposed as promising candidates to
engineer thermal diodes, switches and transistors. However, several details of
heat transport in these materials still need to be uncovered both in the bulk
diffusive regime and in the nanoscale regime.
Using a multiscale approach, encompassing large-scale molecular dynamics,
lattice dynamics simulations and ab initio calculations, we explored the
microscopic mechanisms of heat transport various two-dimensional materials and
device. Specifically, our quantum mechanical phonon calculations provide a
microscopic interpretation of recent measurements of high thermal resistance
multilayer graphene junctions. Furthermore, we address quasi-ballistic phonon
transport regime in pure and lithium-intercalated molybdenum disulphide. We
show that lithium intercalation and strain enable a large dynamical tuning of
the thermal conductivity both in-plane and cross-plane. This property can be
exploited to realize electrochemical thermal transistors with reversible
modulation of the thermal conductance over a factor 10X.
Host: Ion Errea