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29 March 2024
 
  » arxiv » 1106.2880

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Tunable thermal conductivity in defect engineered nanowires at low temperatures
Sajal Dhara ; Hari S. Solanki ; Arvind Pawan R. ; Vibhor Singh ; Shamashis Sengupta ; B.A. Chalke ; Abhishek Dhar ; Mahesh Gokhale ; Arnab Bhattacharya ; Mandar M. Deshmukh ;
Date 15 Jun 2011
AbstractWe measure the thermal conductivity ($kappa$) of individual InAs nanowires (NWs), and find that it is 3 orders of magnitude smaller than the bulk value in the temperature range of 10 to 50 K. We argue that the low $kappa$ arises from the strong localization of phonons in the random superlattice of twin-defects oriented perpendicular to the axis of the NW. We observe significant electronic contribution arising from the surface accumulation layer which gives rise to tunability of $kappa$ with the application of electrostatic gate and magnetic field. Our devices and measurements of $kappa$ at different carrier concentrations and magnetic field without introducing structural defects, offer a means to study new aspects of nanoscale thermal transport.
Source arXiv, 1106.2880
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