157 citations · 407 across the 9 of their papers we have counts for
9 papers
Non-Hermitian Topology and Boundary Jordan Chains with Generalized Chiral Symmetry
Alex Westström, Wenbu Duan, Jian Li
We study a generalization of chiral symmetry applicable to non-Hermitian systems and its topological consequences on one-dimensional chains. We find a rich family of topological ph…
Amorphous topological superconductivity in a Shiba glass
Kim Pöyhönen, Isac Sahlberg, Alex Westström +1
Topological states of matter support quantized nondissipative responses and exotic quantum particles that cannot be accessed in common materials. The exceptional properties and app…
Designer curved-space geometry for relativistic fermions in Weyl metamaterials
Alex Westström, Teemu Ojanen
Weyl semimetals are recently discovered materials supporting emergent relativistic fermions in the vicinity of band-crossing points known as Weyl nodes. The positions of the nodes…
Engineering 1D topological phases on -wave superconductors
Isac Sahlberg, Alex Westström, Kim Pöyhönen +1
In this work, we study how, with the aid of impurity engineering, two-dimensional -wave superconductors can be employed as a platform for one-dimensional topological phases. We…
Skyrmion-induced subgap states in p-wave superconductors
Kim Pöyhönen, Alex Westström, Sergey S. Pershoguba +2
In s-wave systems, it has been theoretically shown that a ferromagnetic film hosting a skyrmion can induce a bound state embedded in the opposite-spin continuum. In this work, we c…
Topological superconductivity and anti-Shiba states in disordered chains of magnetic adatoms
Alex Westström, Kim Pöyhönen, Teemu Ojanen
Regular arrays of magnetic atoms on a superconductor provide a promising platform for topological superconductivity. In this work we study effects of disorder in these systems, foc…
Topological superconductivity in ferromagnetic atom chains beyond the deep-impurity regime
Kim Pöyhönen, Alex Westström, Teemu Ojanen
Recent developments in the search for topological superconductivity have brought lattices of magnetic adatoms on a superconductor into intense focus. In this work we will study fer…
Topological properties of helical Shiba chains with general impurity strength and hybridization
Alex Westström, Kim Pöyhönen, Teemu Ojanen
Recent experiments announced an observation of topological superconductivity and Majorana quasiparticles in Shiba chains, consisting of an array of magnetic atoms deposited on top…
Majorana states in helical Shiba chains and ladders
Kim Pöyhönen, Alex Westström, Joel Röntynen +1
Motivated by recent proposals to realize Majorana bound states in chains and arrays of magnetic atoms deposited on top of a superconductor, we study the topological properties of v…