343 citations · 1.4k across the 38 of their papers we have counts for
9 papers · 1 filter
Probing Local Topology in a Disordered Higher-Order Topological Insulator
Johannes Düreth, Simon Widmann, Philipp Gagel +13
Higher-order topology is prized for its ability to realize lower-dimensional boundary states which are stable beyond fine-tuning. However, disorder presents a failure mechanism tha…
Semiconductor Meta-Graphene and Valleytronics
Praveen Pai, Aron W. Cummings, Alexander Cerjan +3
Nano-patterned semiconductor interfaces offer a versatile platform for creating quantum metamaterials and exploring novel electronic phenomena. In this study, we illustrate this co…
Dynamically reconfigurable topological routing in nonlinear photonic systems
Stephan Wong, Simon Betzold, Sven Hofling +1
The propagation path of topologically protected states is bound to the interface between regions with different topology, and as such, the functionality of linear photonic devices…
Detecting local topology with the spectral localizer
Alexander Cerjan, Hermann Schulz-Baldes
The spectral localizer is a predictive framework for the computation of topological invariants of natural and artificial materials. Here, three crucial improvements on the criterio…
Dimensional crossover of class D real-space topological invariants
Martin Rodriguez-Vega, Terry A. Loring, Alexander Cerjan
The topological properties of a material depend on its symmetries, parameters, and spatial dimension. Changes in these properties due to parameter and symmetry variations can be un…
Classification of Fragile Topology Enabled by Matrix Homotopy
Ki Young Lee, Stephan Wong, Sachin Vaidya +2
The moire flat bands in twisted bilayer graphene have attracted considerable attention not only because of the emergence of correlated phases but also due to their nontrivial topol…
Topological phenomena in artificial quantum materials revealed by local Chern markers
Catalin D. Spataru, Wei Pan, Alexander Cerjan
A striking example of frustration in physics is Hofstadter's butterfly, a fractal structure that emerges from the competition between a crystal's lattice periodicity and the magnet…
Bi-stability and period-doubling cascade of frequency combs in exceptional-point lasers
Xingwei Gao, Hao He, Weng W. Chow +2
Recent studies have demonstrated that a laser can self-generate frequency combs when tuned near an exceptional point (EP), where two cavity modes coalesce. These EP combs induce pe…
Topological photonic crystal fibre
Bofeng Zhu, Kevin Hean, Stephan Wong +8
Photonic crystal fibres (PCFs) are optical fibres that guide light using a modulated dielectric medium. They provide an exceptionally versatile platform for various applications, t…