scholarly journals Incommensurate spin density wave as a signature of spin-orbit coupling and precursor of topological superconductivity

2016 ◽  
Vol 94 (21) ◽  
Author(s):  
Aaron Farrell ◽  
P.-K. Wu ◽  
Y.-J. Kao ◽  
T. Pereg-Barnea
Keyword(s):  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Topological Superconductivity

scholarly journals Intrinsic First and Higher-Order Topological Superconductivity in a Doped Topological Insulator

2021 ◽  
Author(s):  
Harley Scammell ◽  
Julian Ingham ◽  
Max Geier ◽  
Tommy Li
Keyword(s):  
Chemical Potential ◽  
Interaction Strength ◽  
Higher Order ◽  
Second Order ◽  
Orbit Coupling ◽  
Order Topology ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Wave State ◽  
Topological Superconductivity

Abstract We explore higher-order topological superconductivity in an artificial Dirac material with intrinsic spin-orbit coupling. A mechanism for superconductivity due to repulsive interactions – pseudospin pairing – has recently been shown to result in higher-order topology in Dirac systems past a minimum chemical potential [1]. Here we apply this theory through microscopic modelling of a superlattice potential imposed on an inversion symmetric hole-doped semiconductor heterostructure, and extend previous work to include the effects of spin-orbit coupling. We find spin-orbit coupling enhances interaction effects, providing an experimental handle to increase the efficiency of the superconducting mechanism. We find that the phase diagram, as a function of chemical potential and interaction strength, contains three superconducting states – a first-order topological p + ip state, a second-order topological spatially modulated p + iτp state, and a second-order topological extended s-wave state, sτ. We calculate the symmetry-based indicators for the p + iτp and sτ states, which prove these states possess second-order topology. Exact diagonalisation results are presented which illustrate the interplay between the boundary physics and spin orbit interaction. We argue that this class of systems offer an experimental platform to engineer and explore first and higher-order topological superconducting states.

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