title: Universal dielectric loss in glass from simultaneous bias and microwave fields.
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. A predicted loss function can be understood in a Landau-Zener theory and used to extract the two-level system density, dipole moment, and relaxation rate.
authors.affiliation: Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA.
authors.forename: Alexander L
authors.initials: AL
authors.lastname: Burin
authors.affiliation: Laboratory for Physical Sciences (LPS), 8050 Greenmead Drive, College Park, Maryland 20740, USA.
authors.forename: Moe S
authors.initials: MS
authors.lastname: Khalil
authors.affiliation: Laboratory for Physical Sciences (LPS), 8050 Greenmead Drive, College Park, Maryland 20740, USA.
authors.forename: Kevin D
authors.initials: KD
authors.lastname: Osborn