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Showing 1 to 6 of 6 for “"localized excitations"”.
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Low-energy, localized excitations in amorphous polymers
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-20T20:03:53Z No. of bitstreams: 1 1980_matsumoto.pdf: 4103014 bytes, checksum: 0ca927dd0f785f97fb48332794b75f28 (MD5)
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Phonon thermal transport in metallic glasses below 100 K
… have led us to the conclusion that the localized excitations responsible for the anomalous behavior of nonmetallic glasses are also present in the metallic glasses. We succeeded in manipulating the density of the two-level systems in our PdSi rods by heat treating them. Since the plateau …
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Low-temperature thermal expansion of amorphous solids
… of coupling strengths between phonons and the localized excitations thought to be characteristic of the glassy state."
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The effect of neutron irradiation on the density of low-energy excitations in vitreous silica
… that K and Deltav/v are determined by the same localized excitations responsible for C , but the temperature dependence of the dielectric constant may have a different, though possibly related, origin. Furthermore, a consistent account for the measured C , K, ex and Deltav/v of unirradiated …
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Quantum breathers in small networks: Dynamics, tunneling, correlations, and application to Josephson cells
… discrete breathers are time periodic space localized solutions of the underlying classical equations of motion. We do a systematic analysis of the spectrum and eigenstates of such small systems, characterizing quantum breather states by their tunnelling rate (energy splitting), site …
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Defects and Rearrangements in Disordered Solids
… them.</p> <p>We develop a new method to isolate localized defects from extended vibrational modes in disordered solids. This method augments particle interactions with an artificial potential that acts as a high-pass filter: it preserves small-scale structures while pushing extended vibrational …