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Title: Effect of phonon confinement on lattice thermal conductivity of lead Telluride quantum well structure

Abstract

The paper examines the effect of spatial confinement of acoustic phonons on average group velocity and consequently the lattice thermal conductivity of a free-standing PbTe quantum well structure and their temperature dependence. The average group velocity at 100 Å decreases 30% to the bulk value and falls more rapidly on reducing the width of quantum well. Moreover, the lattice thermal conductivity of 100 Å wide PbTe quantum well with value of 0.60 W/mK shows considerable decrease of 70% compared to it’s bulk value. It is observed that the effect of reduction in well width is less pronounce as temperature increases. This appears mainly due to dominance of umklapp processes over the confinement effects.

Authors:
 [1]
  1. Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya, Bilaspur-495009, Chhattisgarh (India)
Publication Date:
OSTI Identifier:
22269296
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CONFINEMENT; LEAD TELLURIDES; PHONONS; QUANTUM WELLS; TEMPERATURE DEPENDENCE; THERMAL CONDUCTIVITY; UMKLAPP PROCESSES

Citation Formats

Tripathi, Madhvendra Nath, E-mail: ommadhav27@gmail.com. Effect of phonon confinement on lattice thermal conductivity of lead Telluride quantum well structure. United States: N. p., 2014. Web. doi:10.1063/1.4872943.
Tripathi, Madhvendra Nath, E-mail: ommadhav27@gmail.com. Effect of phonon confinement on lattice thermal conductivity of lead Telluride quantum well structure. United States. https://doi.org/10.1063/1.4872943
Tripathi, Madhvendra Nath, E-mail: ommadhav27@gmail.com. 2014. "Effect of phonon confinement on lattice thermal conductivity of lead Telluride quantum well structure". United States. https://doi.org/10.1063/1.4872943.
@article{osti_22269296,
title = {Effect of phonon confinement on lattice thermal conductivity of lead Telluride quantum well structure},
author = {Tripathi, Madhvendra Nath, E-mail: ommadhav27@gmail.com},
abstractNote = {The paper examines the effect of spatial confinement of acoustic phonons on average group velocity and consequently the lattice thermal conductivity of a free-standing PbTe quantum well structure and their temperature dependence. The average group velocity at 100 Å decreases 30% to the bulk value and falls more rapidly on reducing the width of quantum well. Moreover, the lattice thermal conductivity of 100 Å wide PbTe quantum well with value of 0.60 W/mK shows considerable decrease of 70% compared to it’s bulk value. It is observed that the effect of reduction in well width is less pronounce as temperature increases. This appears mainly due to dominance of umklapp processes over the confinement effects.},
doi = {10.1063/1.4872943},
url = {https://www.osti.gov/biblio/22269296}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1591,
place = {United States},
year = {Thu Apr 24 00:00:00 EDT 2014},
month = {Thu Apr 24 00:00:00 EDT 2014}
}