35 citations · 150 across the 22 of their papers we have counts for
10 papers · 1 filter
Ubiquitous topological materials protected by hidden partial symmetries
Lumen Eek, Xuelong Chen, Malte Röntgen +2
Symmetries play a crucial role in protecting the topological phases of insulators, ensuring the robustness of their surface states against perturbations. Traditionally, these symme…
Topology Obstructs Nodeless Excitons
Lumen Eek
Lowest-energy excitons are usually expected to have nodeless -like envelope wavefunctions. We show that band topology can obstruct this expectation. The exciton envelope wavefu…
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…
Tensor-network methodology for real-space super-moiré excitons
Anouar Moustaj, Yitao Sun, Tiago V. C. Antão +2
Computing excitonic spectra in quasicrystal and super-moiré systems constitutes a formidable challenge due to the exceptional size of the excitonic Hilbert space. Here, we demonstr…