Low temperature universality in disordered solids

Abstract

The low temperature universal properties in disordered and amorphous solids are considered. We introduce a model that includes two types of two level systems (TLSs), which, based on their local symmetry, interact weakly or strongly with the phonon field. This accounts well for the experimental results, and addresses some long-standing questions: the nature of the TLSs; the smallness and universality of the phonon attenuation, and the energy scale of $3$K below which universality is observed. Our model describes disordered lattices; we also discuss its application to amorphous solids.

12 pages, 4 figures, published version

References in corpus (2)

• Identification of strong and weak interacting two level systems in KBr:CN
• What are the interactions in quantum glasses?

Cited by in corpus (24)

• Towards understanding two-level-systems in amorphous solids -- Insights from quantum circuits
• Decoherence spectroscopy with individual two-level tunneling defects
• Wave attenuation in glasses: Rayleigh and generalized-Rayleigh scattering scaling
• Universal Sound Absorption in Amorphous Solids: A Theory of Elastically Coupled Generic Blocks
• Quantum Sensors for Microscopic Tunneling Systems
• Why phonon scattering in glasses is universally small at low temperatures
• Non-homogeneity of the density of states of tunneling two-level systems at low energies
• Decoherence of a quantum two-level system by spectral diffusion
• Observation of giant two-level systems in a granular superconductor
• Correlated random fields in dielectric and spin glasses
• Nonuniversality and strongly interacting two-level systems in glasses at low temperatures
• Experimentally revealing anomalously large dipoles in a quantum-circuit dielectric
• Rabi noise spectroscopy of individual two-level tunneling defects
• The effect of interactions and disorder on the relaxation of two-level systems in amorphous solids
• 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
• Universal frequency-dependent conduction of electron glasses
• Anomalous Loss Reduction Below Two-Level System Saturation in Aluminum Superconducting Resonators
• 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${}_2$
• Universal Sound Attenuation in Amorphous Solids at Low-Temperatures
• Thermal cycling -- evidence for a generalized tunneling model and a tool to distinguish noise sources in quantum circuits
• Spectroscopy and Coherent Control of Two-Level System Defect Ensembles Using a Broadband 3D Waveguide