Thermal resistance at constrictions in 2D mesoscopic ribbons at low temperatures

27th International Conference on Low Temperature Physics

Ramiere, A.^1 ; Amrit, J.^1 ; Volz, S.^2

Laboratoire d'Informatique Pour la Mécanique et les Sciences de l'Ingénieur, UPR CNRS 3251, Université Paris-Sud, Rue John von Neumann, Orsay

91403, France^1

Energétique Moléculaire et Macroscopique, Combustion, UPR CNRS 288, Ecole Centrale Paris, Grande Voie des Vignes, Chatenay-Malabry

92295, France^2

关键词: Frequency dependent;    Low temperatures;    Mesoscopics;    Phonon transport;    Structural configurations;    Suspended membranes;    Transmission coefficients;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/5/052023/pdf
DOI  :  10.1088/1742-6596/568/5/052023

来源: IOP

【 摘 要 】

Phonon transport in junctions formed between suspended membranes of the same material is studied using Monte Carlo method. The investigation is conducted at 1K for systematically chosen ratios of (d/D) where d is the junction width and D the membrane length. The influence of surface roughness is taken into account. The dependency of the constriction thermal resistance (in μmK/W) is established: RJ[2.4 + 2.0 × (d /D)-1/2] × 109. The average and frequency dependent transmission coefficients are determined as a function of (d/D). These structural configurations are inherent in thermoelectric; and graphene and silicene related applications.