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Titolo:
Effect of surface roughness on the universal thermal conductance - art. no. 184306
Autore:
Santamore, DH; Cross, MC;
Indirizzi:
CALTECH, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125CALTECH, Pasadena, CA 91125 USA
Titolo Testata:
PHYSICAL REVIEW B
fascicolo: 18, volume: 6318, anno: 2001,
pagine: 4306 -
SICI:
0163-1829(20010501)6318:18<4306:EOSROT>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUANTUM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
7
Recensione:
Indirizzi per estratti:
Indirizzo: Santamore, DH CALTECH, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125 LTECH, Pasadena, CA 91125 USA
Citazione:
D.H. Santamore e M.C. Cross, "Effect of surface roughness on the universal thermal conductance - art. no. 184306", PHYS REV B, 6318(18), 2001, pp. 4306

Abstract

We explain the reduction of the thermal conductance below the predicted universal value observed by Schwab at al. [Nature (London) 404, 974 (2000)] in terms of the scattering of thermal phonons off surface roughness using a scalar model for the elastic waves. Our analysis shows that the thermal conductance depends oil two roughness parameters: the roughness amplitude delta and the correlation length a. At sufficiently low temperatures the ratio of the conductance to the universal value decreases quadratically with temperature at a rate proportional to delta (2)a. Values of delta equal to 22% and a equal to about 75% of the width of the conduction pathway give a goodfit to the data.

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Documento generato il 05/07/20 alle ore 09:04:32