Identification of strong and weak interacting two level systems in KBr:CN

Abstract

Tunneling two level systems (TLSs) are believed to be the source of phenomena such as the universal low temperature properties in disordered and amorphous solids, and $1/f$ noise. The existence of these phenomena in a large variety of dissimilar physical systems testifies for the universal nature of the TLSs, which however, is not yet known. Following a recent suggestion that attributes the low temperature TLSs to inversion pairs [M. Schechter and P.C.E. Stamp, arXiv:0910.1283.] we calculate explicitly the TLS-phonon coupling of inversion symmetric and asymmetric TLSs in a given disordered crystal. Our work (a) estimates parameters that support the theory in M. Schechter and P.C.E. Stamp, arXiv:0910.1283, in its general form, and (b) positively identifies, for the first time, the relevant TLSs in a given system.

minor modifications, published version

References in corpus (3)

• Low- and high-frequency noise from coherent two-level systems
• What are the interactions in quantum glasses?
• Correlated random fields in dielectric and spin glasses

Cited by in corpus (13)

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• Nonuniversality and strongly interacting two-level systems in glasses at low temperatures
• Experimentally revealing anomalously large dipoles in a quantum-circuit dielectric
• Anomalous low-energy properties in amorphous solids and the interplay of electric and elastic interactions of tunneling two-level systems
• Acoustic interactions between inversion symmetric and asymmetric two-level systems
• The strain gap in a system of weakly and strongly interacting two-level systems
• Insights on the coupling between vibronically active molecular vibrations and lattice phonons in molecular nanomagnets
• Ar:N${}_2$ - a non-universal glass
• Inexpensive discrete atomistic model technique for studying excitations on infinite disordered media: the case of orientational glass ArN${}_2$
• Thermal cycling -- evidence for a generalized tunneling model and a tool to distinguish noise sources in quantum circuits