Significant decrease of the lattice thermal conductivity due to phonon confinement in a free-standing semiconductor quantum well

Alexander Balandin, Kang L. Wang

Research output: Contribution to journalArticlepeer-review

520 Citations (Scopus)

Abstract

Lattice thermal conductivity of a quantum well limited by umklapp, impurity, and boundary scattering was investigated theoretically by taking into account dispersion of confined acoustic-phonon modes. We show that strong modification of phonon group velocities due to spatial confinement leads to a significant increase in the phonon relaxation rates. From the numerical calculations, we predict a decrease by an order of magnitude of the lattice thermal conductivity in a 100-Å-wide free-standing quantum well. Our theoretical results are consistent with recent experimental investigations of the lateral thermal conductivity of nitride/silicon/oxide membranes conducted in our group.

Original languageEnglish
Pages (from-to)1544-1549
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number3
DOIs
Publication statusPublished - 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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