19 citations · 65 across the 12 of their papers we have counts for
12 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 in Nonmagnetic Materials
Viktor Könye, Ihor Nimyi, Oleg Janson +3
Some topological phases of matter are called fragile. They can be trivialized by adding additional valence bands and do not generically host protected gapless boundary states. Here…
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 in the quantum Hall effect of graphene
Burak Özer, Kyrylo Ochkan, Raghav Chaturvedi +12
Quantum Hall phases have recently emerged as a platform to investigate non-Hermitian topology in condensed-matter systems. This platform is particularly interesting due to its tuna…
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…
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…
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…
Phase transitions of wave packet dynamics in disordered non-Hermitian systems
Helene Spring, Viktor Könye, Fabian A. Gerritsma +2
Disorder can localize the eigenstates of one-dimensional non-Hermitian systems, leading to an Anderson transition with a critical exponent of 1. We show that, due to the lack of en…
Anisotropic optics and gravitational lensing of tilted Weyl fermions
Viktor Könye, Lotte Mertens, Corentin Morice +4
We show that tilted Weyl semimetals with a spatially varying tilt of the Weyl cones provide a platform for studying analogues to problems in anisotropic optics as well as curved sp…
Horizon physics of quasi-one-dimensional tilted Weyl cones on a lattice
Viktor Könye, Corentin Morice, Dmitry Chernyavsky +3
To simulate the dynamics of massless Dirac fermions in curved spacetimes with one, two, and three spatial dimensions we construct tight-binding Hamiltonians with spatially varying…
General formalism for calculating the thermal efficiency of thermodynamic cycles defined in a diagram
Viktor Könye, József Cserti
We develop a general method for calculating the thermal efficiency of arbitrary thermodynamic cycles defined in the pressure-volume () diagram. To demonstrate how effective ou…
Magnetoresistance of a three-dimensional Dirac gas
Viktor Könye, Masao Ogata
We study the transversal magnetoconductivity and magnetoresistance of a massive Dirac fermion gas. This can be used as a simple model for gapped Dirac materials. In the zero-mass l…