Two-level systems and mass deficit in quantum solids

Details Two-level systems and mass deficit in quantum solids Two-level systems and mass deficit in quantum solids

2009-06-25

arxiv.org/abs/0906.4627v2

Pis'ma ZhETF 90, 167 (2009) [JETP Lett. 90, 156 (2009)]

Physics

Condensed Matter

Other Condensed Matter

4 pages, LaTeX

Scientific paper

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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