Higgs mode in the d-wave superconductor Bi2Sr2CaCu2O8+x driven by an intense terahertz pulse

Abstract

We investigated the terahertz (THz)-pulse driven nonlinear response in the d-wave cuprate superconductor Bi2Sr2CaCu2O8+x (Bi2212) using a THz pump near-infrared probe scheme in the time domain. We have observed an oscillatory behavior of the optical reflectivity that follows the THz electric field squared and is strongly enhanced below Tc. The corresponding third-order nonlinear effect exhibits both A1g and B1g symmetry components, which are decomposed from polarization-resolved measurements. Comparison with a BCS calculation of the nonlinear susceptibility indicates that the A1g component is associated with the Higgs mode of the d-wave order parameter.

14 pages, 4 figures + supplemental material

References in corpus (6)

• Inelastic Light Scattering From Correlated Electrons
• Amplitude / Higgs Modes in Condensed Matter Physics
• Energy gaps in high-transition temperature cuprate superconductors
• Measuring the gap in ARPES experiments
• Abrupt transition in quasiparticle dynamics at optimal doping in a cuprate superconductor system
• Direct observation of the coexistence of pseudogap and superconducting quasi-particles in Bi2212 by time-resolved optical spectroscopy

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