Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.8: Poster

Monday, March 23, 2009, 13:00–16:45, P1A

Response and transport in non–centrosymmetric superconductors — •Ludwig Klam¹, Dietrich Einzel², and Dirk Manske¹ — ¹Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany — ²Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany

We formulate a kinetic theory for non–centrosymmetric superconductors (NCS) at low temperatures in the clean limit. The transport equations are solved quite generally in spin– and particle–hole (Nambu) space by performing first a transformation into the so–called helicity–band basis and second a Bogoliubov transformation to the quasiparticle–quasihole phase space. Our result is a particle–hole–symmetric, gauge–invariant and charge conserving description, which is valid in the whole quasiclassical regime (|q|≪ k_F and ω≪ E_F). Including the long–range Coulomb interaction, we calculate the Lindhard, the dielectric, and the Raman response function.

For the Raman case, we present within this framework our recent results for the polarization–dependence of the electronic (pair–breaking) Raman response for NCS at zero temperature. Furthermore, we use a Green’s function approach in order to calculate the dynamic spin susceptibility for the β-band of CePt₃Si where the 3D band–structure can be obtained from recent ARPES measurements. Finally, we identify the relevant wave vectors for Cooper–pairing mediated by the spin susceptibility.