“Thermal conductance quantum”的意思、由来-开放百科全书

In physics, the thermal conductance quantum

describes the rate at which heat is transported through a single ballistic phonon channel of temperature

. It is given by:

The thermal conductance of any electrically insulating structure that exhibits ballistic phonon transport is a positive integer multiple of

. The thermal conductance quantum was first measured in 2000.^[1] These measurements employed suspended silicon nitride nanostructures that exhibited a constant thermal conductance of 16

at temperatures below approximately 0.6 kelvin.

For ballistic electrical conductors, the electron contribution to the thermal conductance is also quantized as a result of the electrical conductance quantum and the Wiedemann–Franz law, which has been quantitatively measured at both cryogenic (~20 mK) ^[2] and room temperature (~300K).^[3]^[4]

The thermal conductance quantum, also called as quantized thermal conductance, maybe understood from the Wiedemann-Franz law, which show that

References

1. ^{{cite journal|title=Measurement of the quantum of thermal conductance|journal=Nature|year=2000|first=K.|last=Schwab|author2=E. A. Henriksen |author3=J. M. Worlock |author4=M. L. Roukes |volume=404|pages=974–7|doi=10.1038/35010065|pmid=10801121|issue=6781|bibcode=2000Natur.404..974S}}
2. ^{{cite journal|title=Quantum Limit of Heat Flow Across a Single Electronic Channel|journal=Science|year=2013|first=S. |display-authors=etal |last=Jezouin |volume=342|issue=6158|pages=601–604|doi=10.1126/science.1241912|pmid=24091707|arxiv=1502.07856|bibcode=2013Sci...342..601J}}
3. ^{{cite journal|title=Quantized thermal transport in single-atom junctions|journal=Science|year=2017|first=L. |display-authors=etal |last=Cui|volume=355|issue=6330|pages=1192–1195|doi=10.1126/science.aam6622|pmid=28209640|bibcode=2017Sci...355.1192C}}
4. ^{{cite journal |last1=Mosso |first1=N. |display-authors=etal |title=Heat transport through atomic contacts |journal=Nature Nanotechnology |date=2017 |volume=12 |issue=5 |pages=430–433 |doi=10.1038/nnano.2016.302 |pmid=28166205 |url=https://www.nature.com/articles/nnano.2016.302|arxiv=1612.04699 }}

References

See also