Giant Drop of the Lattice Thermal Conductivity Due to Confinement of Acoustic Phonons
Abstract
Lattice thermal conductivity of a quantum well was investigated taking into account dispersion of confined acoustic phonon modes. We show that strong modificafion of phonon group velocities due to spatial confinment leads to significant increase in the phonon relaxation rates and corresponding drop in the the lattice thermal conductivitv (13% of the bulk value for 10 nm well). 0ur theoretical results are consistent with the recent experimental investigations of the thermal conductivity of a 155 nm wide Si3N4(l50 nm)/Si(155 nm)/SiO2(3OO nm) quantum wll conducted in our group.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1998
- Accession Number
- ADP012717
Entities
People
- A. Balandin
- Kang L. Wang
Organizations
- University of California, Berkeley