Interaction of two level systems in amorphous materials with arbitrary phonon fields

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dc.creatorAnghel, D. V.
dc.creatorKühn, T.
dc.creatorGalperin, Y. M.
dc.creatorManninen, M.
dc.date2006-10-17
dc.date2007-11-15
dc.date.accessioned2026-07-07T08:42:59Z
dc.date.available2026-07-07T08:42:59Z
dc.descriptionTo describe the interaction of the two level systems (TLSs) of an amorphous solid with arbitrary strain fields, we introduce a generalization of the standard interaction Hamiltonian. In this new model, the interaction strength depends on the orientation of the TLS with respect to the strain field through a $6\times 6$ symmetric tensor of deformation potential parameters, $[R]$. Taking into account the isotropy of the amorphous solid, we deduce that $[R]$ has only two independent parameters. We show how these two parameters can be calculated from experimental data and we prove that for any amorphous bulk material the average coupling of TLSs with longitudinal phonons is always stronger than the average coupling with transversal phonons (in standard notations, $γ_l>γ_t$).
dc.description7 pages and 1 figure
dc.identifierhttps://arxiv.org/abs/cond-mat/0610469
dc.identifierhttp://arxiv.org/abs/cond-mat/0610469
dc.identifierPhys. Rev. B 75, 064202 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.064202
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/142159
dc.subjectDisordered Systems and Neural Networks
dc.titleInteraction of two level systems in amorphous materials with arbitrary phonon fields
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