Nonuniversality and strongly interacting two-level systems in glasses at low temperatures

Abstract

Recent experimental results showing untypical nonlinear absorption and marked deviations from well known universality in the low temperature acoustic and dielectric losses in amorphous solids prove the need for improving the understanding of the nature of two-level systems (TLSs) in these materials. Here we suggest the study of TLSs focused on their properties which are nonuniversal. Our theoretical analysis shows that the standard tunneling model and the recently suggested Two-TLS model provide markedly different predictions for the experimental outcome of these studies. Our results may be directly tested in disordered lattices, e.g KBr:CN, where there is ample theoretical support for the validity of the Two-TLS model, as well as in amorphous solids. Verification of our results in the latter will significantly enhance understanding of the nature of TLSs in amorphous solids, and the ability to manipulate them and reduce their destructive effect in various cutting edge applications including superconducting qubits.

arXiv comment12 pages, 4 figures

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Cited by in corpus (5)

• Towards understanding two-level-systems in amorphous solids -- Insights from quantum circuits
• Anomalous low-energy properties in amorphous solids and the interplay of electric and elastic interactions of tunneling two-level systems
• The strain gap in a system of weakly and strongly interacting two-level systems
• Anomalous Loss Reduction Below Two-Level System Saturation in Aluminum Superconducting Resonators
• Thermal cycling -- evidence for a generalized tunneling model and a tool to distinguish noise sources in quantum circuits