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| VOLUME 90 | ISSUE 2 |
PAGE 167
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| Two-level systems and mass deficit in quantum solids |
S. E. Korshunov
L.D. Landau Institute for Theoretical Physics, 119334 Moscow, Russia
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PACS: 61.43.-g, 67.40.-s, 67.80.Bd
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Abstract
We study a disordered quantum solid incorporating two-level
systems in which a group of atoms (or a single atom) can experience coherent
tunnelling between two different positions and demonstrate
that an effective mass deficit induced by the presence of
such objects can manifest itself only at relatively high frequencies
and should vanish in the low-frequency limit. The crossover to the
regime which can be associated with the appearance of an effective mass
deficit has been observed in recent torsional oscillator experiments.
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