Distinguishing between spatial coherence and temporal coherence of phonons
- Creators
- Latour, Benoit
- Chalopin, Yann
Abstract
Coherent phonon transport is regarded as a promising strategy for controlling thermal properties in solids using the wave nature of phonons. However, no clear distinction between the spatial and temporal phonon coherence has been accounted for and a formalism that quantifies these two effects is still to be found. In this work, we propose a statistical approach for calculating the spatial and temporal coherence spectra using molecular dynamics simulations. We provide a microscopic assessment of these properties and we theoretically demonstrate that, while temporal and spatial coherence can be analytically related under specific conditions, they represent two characteristic lengths that set apart different physical effects. The former is associated with the phonon mean free path while the latter can be regarded as a measure of localization, representing the spatial extension of phonon wave packets. This provides a framework to engineer heat conduction in solids by quantitatively revealing the wave/particle nature of the vibrational modes.
Additional Information
© 2017 American Physical Society. Received 12 December 2016; published 30 June 2017. We acknowledge the support of the ENIAC program under the NANOTEG Project Grant No. 270789-2 and of the French Ministry of Defense (Direction Générale de l'Armement).Attached Files
Published - PhysRevB.95.214310.pdf
Supplemental Material - supplementary_information.pdf
Supplemental Material - wave_packet_A_ballistic_coherent.avi
Supplemental Material - wave_packet_B_interface_scattering.avi
Supplemental Material - wave_packet_C_standing_mode.avi
Files
Name | Size | Download all |
---|---|---|
md5:b9098894d214d4a84aaa5c07d66fc08e
|
334.7 kB | Download |
md5:67a97d5a648992edeb8fc24791c7f4c9
|
3.4 MB | Preview Download |
md5:a6e05f77052fc32a3e7e1385917217ee
|
64.0 kB | Preview Download |
md5:e2dfed5f0453cc30d02540e1daa23e5f
|
304.7 kB | Download |
md5:c31e221b479d114cb8db2f3fce5cf5ef
|
394.9 kB | Download |
Additional details
- Eprint ID
- 78729
- Resolver ID
- CaltechAUTHORS:20170630-111559684
- 270789-2
- ENIAC Joint Undertaking
- Direction Générale de l'Armement
- Created
-
2017-06-30Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field