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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Poster Session

TT 30.8: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P1

Topological phase transition away from the Fermi surface in multiband superconductors — •Masoud Bahari¹, Song-Bo Zhang², Chang-An Li¹, Carsten Timm³, and Björn Trauzettel¹ — ¹Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany — ²Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland — ³Institute of Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany

We demonstrate theoretically that odd-parity multiband superconductors with inversion symmetry host dispersive topological surface states induced solely by interband pairing away from the Fermi surface. The normal state requires to have at least a pair of energy bands with different effective masses. In this regard, spin-orbit coupling is a key ingredient. The topological phase transition occurs between electrons with different quantum numbers at finite excitation energies. Such phase transition happens at direction where the inter- and intraband electron pairings are finite and vanishing at the same time. To capture the underlying physics, we develop a generic theory in the interband representation of Bogoliubov-de Gennes Hamiltonian. We apply our theory to j=3/2 systems and we discuss the pairing channels hosting such surface states.