Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 86: Correlated Electrons: Other Materials
TT 86.10: Talk
Thursday, April 3, 2014, 12:00–12:15, BEY 81
Topological superconducting phases in the doped Kitaev-Heisenberg model — •Daniel Scherer1, Michael Scherer2, Giniyat Khaliullin3, Carsten Honerkamp4,5, and Bernd Rosenow1 — 1Institute for Theoretical Physics, University of Leipzig, D-04103 Leipzig, Germany — 2Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg, Germany — 3Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany — 4Institute for Theoretical Solid State Physics, RWTH Aachen University, D-52056 Aachen, Germany — 5JARA Fundamentals of Future Information Technologies
The Kitaev-Heisenberg model can describe the magnetic ground-state of the spin-orbit Mott insulator Na2IrO3. Here, we present our analysis of the quantum many-body instabilities found in the doped system within the framework of a t-J model. We determine ordering tendencies by the functional renormalization group (fRG) method for correlated fermionic systems in an unbiased way. To this end, we derived fRG flow-equations and Ward identities adapted to the lack of full spin-rotational invariance in the fermionic interactions caused by the highly anisotropic and frustrated Kitaev exchange. The solution of the flow equations suggests a rich phase diagram emerging upon doping charge carriers into the ground-state manifold (quantum spin liquids, magnetically ordered phases) of the Kitaev-Heisenberg Hamiltonian. We confirm superconducting triplet p-wave instabilities driven by ferromagnetic exchange. These p-wave phases turn topological upon increasing doping-level and support Majorana edge-modes.