68 citations · 136 across the 17 of their papers we have counts for
17 papers
Decorated electronic kagome lattice in twisted bilayer germanene
Dennis J. Klaassen, Rian A. M. Ligthart, Andrés R. Botello Mendez +10
Artificial kagome lattices provide a route to electronic flat bands, geometric frustration, and correlation driven phases, but their realization in atomically controlled two-dimens…
Emergent -type topology in a quasi-one-dimensional extended QWZ model
Zebedeus F. Osseweijer, Lumen Eek, Cristiane Morais Smith
We investigate the emergence of zero-dimensional topological end states in nanoribbons described by the Qi-Wu-Zhang (QWZ) model and its extensions with longer-range couplings. Whil…
Fractality-induced photonic topological insulators
Shuming Zhang, Zhaoxin Wu, Lumen Eek +2
Fractal lattices have recently emerged as a promising setting for topological wave physics, but in most realizations the topological character is inherited from externally engineer…
Universality of dimensional crossovers in topological insulators
Lumen Eek, Zeb Osseweijer, Cristiane Morais Smith
We investigate dimensional crossovers in minimal tight-binding models of three-dimensional (3D) topological insulators subject to geometric confinement. While thin films are common…
Topology of honeycomb nanoribbons revisited
Zebedeus F. Osseweijer, Lumen Eek, Harold J. W. Zandvliet +2
We present an in-depth study of end states in honeycomb nanoribbons, focusing on the interplay between nanoribbon termination, chiral symmetry, and complex next-nearest-neighbor ho…
Fragile topology for six-fold rotation symmetry indicated by the concentric Wilson loop spectrum
Xinyang Li, Lumen Eek, Jasper van Wezel +1
We investigate topological phase transitions for the Haldane and Kane-Mele model in a lattice with symmetry, which consists of triangles and hexagons arranged in a two-dimensi…
Enhanced spin-current generation in Dirac altermagnets through Klein tunneling
Tomas T. Osterholt, Lumen Eek, Cristiane Morais Smith +1
Altermagnets have recently emerged as a new platform for spintronics applications, offering spin-split electronic bands despite vanishing net magnetization. Here, we investigate sp…
Electric field-induced spin-valley locking in twisted bilayer buckled honeycomb materials
Harold J. W. Zandvliet, Pantelis Bampoulis, Cristiane Morais Smith +1
A twisted honeycomb bilayer exhibits a moiré superstructure that is composed of a hexagonal arrangement of AB and BA stacked domains separated by domain boundaries. In the case of…
Twist-modulated magnetic interactions in bilayer van der Waals materials
Tomas T. Osterholt, D. O. Oriekhov, Lumen Eek +2
The ability to control magnetic interactions at the nanoscale is crucial for the development of next-generation spintronic devices and functional magnetic materials. In this work,…
Electric-field control of zero-dimensional topological states in ultranarrow germanene nanoribbons
Lumen Eek, Esra D. van 't Westende, Dennis J. Klaassen +3
Reversible, all-electric control of symmetry-protected zero-dimensional modes has been a long-standing goal. In buckled honeycomb lattices, a perpendicular field couples to the sta…
Latent Haldane Models
Anouar Moustaj, Lumen Eek, Malte Rontgen +1
Latent symmetries, which materialize after performing isospectral reductions, have recently been shown to be instrumental in revealing novel topological phases in one-dimensional s…
Emergent non-Hermitian models
Lumen Eek, Anouar Moustaj, Malte Röntgen +3
The Hatano-Nelson and the non-Hermitian Su-Schrieffer-Heeger model are paradigmatic examples of non-Hermitian systems that host non-trivial boundary phenomena. In this work, we use…
The Fractal-Lattice Hubbard Model
Monica Conte, Vinicius Zampronio, Malte Röntgen +1
Here, we investigate the fractal-lattice Hubbard model using various numerical methods: exact diagonalization, the self-consistent diagonalization of a (mean-field) Hartree-Fock Ha…
Field Theoretical Study of Disorder in Non-Hermitian Topological Models
Anouar Moustaj, Lumen Eek, Cristiane Morais Smith
Non-Hermitian systems have provided a rich platform to study unconventional topological phases.These phases are usually robust against external perturbations that respect certain s…
Dirac cones beyond the honeycomb lattice: a symmetry based approach
G. van Miert, C. Morais Smith
Recently, several new materials exhibiting massless Dirac fermions have been proposed. However, many of these do not have the typical graphene honeycomb lattice, which is often ass…
Tuning edge state localization in graphene nanoribbons by in-plane bending
S. G. Stuij, P. H. Jacobse, V. Juricic +1
The electronic properties of graphene are influenced by both geometric confinement and strain. We study the electronic structure of in-plane bent graphene nanoribbons, systems wher…
Signature of stripe pinning in optical conductivity
L. Benfatto, C. Morais Smith
The response of charge stripes to an external electric field applied perpendicular to the stripe direction is studied within a diagrammatic approach for both weak and strong pinnin…