Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 8: Low-Dimensional Systems: Oxide Hetero-Interfaces

TT 8.12: Vortrag

Montag, 16. März 2015, 12:30–12:45, H 3010

Topological superconductivity and unconventional pairing in oxide interfaces — •Mathias Scheurer¹ and Jörg Schmalian^1,2 — ¹Institut für Theorie der kondensierten Materie (Karlsruher Institut für Technologie), Karlsruhe, Deutschland — ²Institut für Festkörperphysik (Karlsruher Institut für Technologie), Karlsruhe, Deutschland

To pinpoint the microscopic mechanism for superconductivity has proven to be one of the most outstanding challenges in the physics of correlated quantum matter. Thus far, the most direct evidence for an electronic pairing mechanism is the observation of a new symmetry of the order parameter, as done in the cuprate high-temperature superconductors. Alternatively, global, topological invariants allow for a sharp discrimination between states of matter that cannot be transformed into each other adiabatically. In this talk we present an unconventional pairing state for the electron fluid in two-dimensional oxide interfaces and establish a direct link to the emergence of nontrivial topological invariants. Topological signatures, in particular Majorana edge states, can then be used to detect the microscopic origin of superconductivity. In addition, we show that the density wave states that compete with superconductivity have very rich spatial textures (magnetic vortices, Skyrmions) and sensitively depend on the nature of the pairing interaction.