Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 7 of 7 for “"thermal phonons"”.
-
The scattering of thermal phonons by mobile dislocations
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-03-21T20:51:27Z No. of bitstreams: 1 1971_malinowski.pdf: 2923570 bytes, checksum: 1135cfc8600631e8b65b51eda59aab8e (MD5)
-
The scattering of thermal phonons by extended defects in dielectric crystals
The scattering of thermal phonons by extended defects in dielectric crystals has been observed through measurements of thermal conductivity and ballistic heat pulse propagation. The thermal conductivities of LiF and NaCt containing 500 low-angle grain boundaries per cm were measured in the range …
-
Anderson localization of thermal phonons : anomalous heat conduction in disordered superlattices
In semiconductor devices, thermal energy is carried by phonons, the quantized excitation of atomic vibrations. These phonons scatter with impurities, electrons, grain boundaries, and other phonons. At a sufficiently large scale, phonon dynamics can be approximated as a Brownian random walk, leading …
-
Lattice thermal conductivity of copper alloys below 2 K
Thermal conductivity measurements have been made between 0.06 and 2 K on copper samples containing either 10 atomic percent aluminum, 30 atomic percent zinc, or 4 atomic percent nickel. These samples were studied in both annealed and heavily deformed conditions. No unusual behavior has been …
-
Transport of free excitons and electron-hole droplets in silicon and germanium
… largely controlled by interaction with lattice phonons. Non-equilibrium phonon fluxes are capable of moving EHD macroscopic distances in ultrapure crystals of silicon and germanium. Both the FE and the EHD shed momentum acquired from external forces by interaction with thermal phonons. This work …
-
Expanding ultrafast photoacoustics for investigation of mechanical properties and thermal transport
… generate and to study longitudinal THz acoustic phonons in GaN based structures. During the investigation of the lifetime of up to a 1.4 THz frequency acoustic phonons, specular reflection from an air/GaN free surface was observed. The photo-excitation of THz acoustic phonons in layered …
-
New Fluorescence Sensors for Critical Materials
… can emit light due to the quenching of thermal phonons (quantised lattice vibrations in a crystalline solid that may enable non-radiative energy relaxation). This opens an additional dimension to mineral fluorescence investigation, and this thesis will report one luminescent response …