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- Title
Two-level systems and mass deficit in quantum solids.
- Authors
Korshunov, S. E.
- 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.
- Subjects
QUANTUM solids; EFFECTIVE mass (Physics); FREQUENCIES of oscillating systems; QUANTUM tunneling; TORSIONAL vibration; PHYSICAL &; theoretical chemistry
- Publication
JETP Letters, 2009, Vol 90, Issue 2, p156
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364009140161