6 papers
Machine learning prediction of the convergence criterion for a topological invariant of finite non-Hermitian chains
Raghav Chaturvedi, Viktor Könye, Ewelina M. Hankiewicz
A topological invariant based on polar-decomposition of matrices correctly captures the topology of finite non-Hermitian chains exhibiting the non-Hermitian skin effect, provided t…
Robust Signatures of Fragile Topology
Viktor Könye, Ihor Nimyi, Oleg Janson +3
Some topological phases of matter are called fragile. They do not generically host protected gapless boundary states and they can be trivialized by adding additional valence bands.…
Multipolar Piezoelectricity and Anisotropic Surface Transport in Alterelectrics
Amber Visser, Viktor Könye, Oleg Janson +3
Altermagnets are an emergent class of materials combining features of ferro- and antiferro-magnetic materials. They have spin-separated bands normally associated with ferromagnets,…
Non-Hermitian topology of transport in the quantum Hall phases in graphene
Raghav Chaturvedi, Viktor Könye, Ewelina M. Hankiewicz +2
It has recently been shown that signatures of non-Hermitian topology can be realized in a conventional quantum Hall device connected to multiple current sources. These signatures m…
Self-consistent surface superconductivity in time-reversal symmetric Weyl semimetals
Mattia Trama, Viktor Könye, Ion Cosma Fulga +1
Weyl semimetals host topologically protected surface states, the so-called Fermi arcs, that have a penetration depth into the bulk that depends on surface-momentum, and diverges at…
Lack of near-sightedness principle in non-Hermitian systems
Helene Spring, Viktor Könye, Anton R. Akhmerov +1
The non-Hermitian skin effect is a phenomenon in which an extensive number of states accumulates at the boundaries of a system. It has been associated to nontrivial topology, with…