Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 45: Superconductivity: (General) Theory
TT 45.4: Talk
Wednesday, March 13, 2013, 15:45–16:00, H21
Establishing Theoretically the Capacity of Resonant Inelastic X-ray Scattering to Probe the Phase and Excitations of the Superconducting Order Parameter — •Pasquale Marra1, Steffen Sykora1, Krzysztof Wohlfeld1, and Jeroen van den Brink1,2 — 1Institute for Theoretical Solid State Physics, IFW Dresden, D-01069 Dresden, Germany — 2Department of Physics, TU Dresden, D-01062 Dresden, Germany
The capability to probe the dispersion of elementary spin, charge, orbital, and lattice excitations has positioned Resonant Inelastic X-ray Scattering (RIXS) at the forefront of photon science. Here we develop the scattering theory for RIXS on superconductors, calculating its momentum-dependent scattering amplitude. Considering unconventional superconductors with different pairing symmetries and, in particular, evaluating the theoretical RIXS spectra for cuprate and pnictide-like systems, we show that the low-energy scattering is strongly affected by the superconducting gap and coherence factors. This establishes RIXS as a tool to disentangle pairing symmetries and to probe the elementary excitations of unconventional superconductors.