Directional thermal channeling : A phenomenon triggered by tight packing of heat sources

Understanding nanoscale thermal transport is critical for nano-engineered devices such as quantum sensors, thermoelectrics, and nanoelectronics. However, despite overwhelming experimental evidence for nondiffusive heat dissipation from nanoscale heat sources, the underlying mechanisms are still not understood. In this work, we show that for nanoscale heat source spacings that are below the mean free path of the dominant phonons in a substrate, close packing of the heat sources increases in-plane scattering and enhances cross-plane thermal conduction. This leads to directional channeling of thermal transport-a novel phenomenon. By using advanced atomic-level simulations to accurately access the lattice temperature and the phonon scattering and transport properties, we finally explain the counterintuitive experimental observations of enhanced cooling for close-packed heat sources. This represents a distinct fundamental behavior in materials science with far-reaching implications for electronics and future quantum devices.

Medienart:

E-Artikel

Erscheinungsjahr:

2021

Erschienen:

2021

Enthalten in:

Zur Gesamtaufnahme - volume:118

Enthalten in:

Proceedings of the National Academy of Sciences of the United States of America - 118(2021), 40 vom: 05. Okt.

Sprache:

Englisch

Beteiligte Personen:

Honarvar, Hossein [VerfasserIn]
Knobloch, Joshua L [VerfasserIn]
Frazer, Travis D [VerfasserIn]
Abad, Begoña [VerfasserIn]
McBennett, Brendan [VerfasserIn]
Hussein, Mahmoud I [VerfasserIn]
Kapteyn, Henry C [VerfasserIn]
Murnane, Margaret M [VerfasserIn]
Hernandez-Charpak, Jorge N [VerfasserIn]

Links:

Volltext

Themen:

Journal Article
Molecular dynamics
Nanoscale heat sources
Nanoscale thermal transport
Phonon transport
Thermal channeling

Anmerkungen:

Date Revised 28.03.2022

published: Print

Citation Status PubMed-not-MEDLINE

doi:

10.1073/pnas.2109056118

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM331218305