157 citations · 537 across the 13 of their papers we have counts for
13 papers
Entanglement from particle number fluctuations in a second-order topological insulator
Mahla Moridi Farimani, Kim Pöyhönen
Higher-order topological insulators are materials with a bulk energy gap featuring gapless modes at -dimensional edges, where . Despite this modified bulk-boundary co…
Quantum Hall effect and Landau levels without spatial long-range correlations
Isac Sahlberg, Moein N. Ivaki, Kim Pöyhönen +1
The spectrum of charged particles in translation-invariant systems in a magnetic field is characterized by the Landau levels, which play a fundamental role in the thermodynamic and…
Quantum walks on random lattices: Diffusion, localization and the absence of parametric quantum speed-up
Rostislav Duda, Moein N. Ivaki, Isac Sahlberg +2
Discrete-time quantum walks, quantum generalizations of classical random walks, provide a framework for quantum information processing, quantum algorithms and quantum simulation of…
Topological Random Fractals
Moein N. Ivaki, Isac Sahlberg, Kim Pöyhönen +1
We introduce the notion of topological electronic states on random lattices in non-integer dimensions. By considering a class model on critical percolation clusters embedded in…
Entanglement echo and dynamical entanglement transitions
Kim Pöyhönen, Teemu Ojanen
We formulate dynamical phase transitions in subsystems embedded in larger quantum systems. Introducing the entanglement echo as an overlap of the initial and instantaneous entangle…
Topological phases without crystalline counterparts
Daniel Varjas, Alexander Lau, Kim Pöyhönen +3
Recent years saw the complete classification of topological band structures, revealing an abundance of topological crystalline insulators. Here we theoretically demonstrate the exi…
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…
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…