Universal dielectric loss in amorphous solids from simultaneous bias and microwave field

Abstract

We derive the ac dielectric loss in glasses due to resonant processes created by two-level systems and a swept electric field bias. It is shown that at sufficiently large ac fields and bias sweep rates the nonequilibrium loss tangent created by the two fields approaches a universal maximum determined by the bare linear dielectric permittivity. In addition this nonequilibrium loss tangent is derived for a range of bias sweep rates and ac amplitudes and show that the loss tangent creates a predicted loss function that can be understood in a Landau-Zener theory and which can be used to extract the TLS density, dipole moment, and relaxation rate.

To appear in Physical Review Letters, 4 pages, 3 figures

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• Dynamical Decoupling of Quantum Two-Level Systems by Coherent Multiple Landau-Zener Transitions
• Stabilization of Qubit Relaxation Rates by Frequency Modulation
• Nonuniversality and strongly interacting two-level systems in glasses at low temperatures
• Theory of nonlinear microwave absorption by interacting two-level systems
• Experimentally revealing anomalously large dipoles in a quantum-circuit dielectric
• Observation and mitigation of microwave echoes from dielectric defects in Josephson traveling wave amplifiers
• Quantum defects from single surface exhibit strong mutual interactions
• Stability of superconducting resonators: motional narrowing and the role of Landau-Zener driving of two-level defects
• Non-equilibrium Dynamics of Two-level Systems directly after Cryogenic Alternating Bias