Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session L13: Dirac Semi-metal Based Topological superconductivity
11:15 AM–2:15 PM,
Wednesday, March 7, 2018
LACC Room: 304A
Sponsoring Unit: DMP
Chair: Vincent Humbert, University of Illinois Urbana-Champaign
Abstract: L13.00006 : Robust semi-Dirac points and unconventional topological phase transitions in superconductor/metal heterostructures
12:39 PM–12:51 PM
(University of Oslo)
Semi-Dirac fermions are known to exist at the critical points of topological phase transitions requiring fine-tuning of the parameters. We show that robust semi-Dirac points can appear in two-dimensional superconductor/metal heterostructures without fine-tuning if one of the layers supports a large intraionic spin-orbit coupling . These semi-Dirac points are topologically stable in the presence of time-reversal and two-fold rotational symmetries, and a single active band in the superconductor. If the metallic layer is tunnel coupled to two different superconductors (effectively a multiband superconductor) in a three-layer-structure the semi-Dirac points can split into two stable Dirac points with opposite chiralities. As an example we consider a heterostructure consisting of layers of superconducting Sr2IrO4 and a metallic t2g electron system, and we predict a rich topological phase diagram as a function of various parameters.
 M. Horsdal and T. Hyart, arXiv:1705.02987.
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