Alexander Cerjan

Time-resolved topology of aperiodically driven systems

Justin T. Cole, Christina Jörg, Terry A. Loring, Alexander Cerjan

Topological phases of periodically driven systems are commonly classified through Floquet Hamiltonians, whose definition relies on a repeated driving cycle. However, this framework breaks down for systems whose realized evolution is aperiodic or nonlinear, even when robust topological phenomena appear to persist. …

Polarization-dependent angularly selective dielectric reflector

Hyosim Yang, Ki Young Lee, Sanghyeok Park, Jiho Noh et autres

Abstract A key limitation of conventional polarizers is their lack of intrinsic angular selectivity. Thus, optical devices that manipulate polarization and propagation direction are forced to realize these two degrees of freedom sequentially, increasing size and complexity. Here, we introduce and experimentally …

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Generating quantum error correcting codes from topological pre-thermal scars

W. N. Faugno, Frank Barrows, Terry A. Loring, Nathan Goldman et autres

Quantum many-body scars are rare nonthermal states embedded within otherwise thermalizing spectra, making them promising candidates for storing and manipulating quantum information. However, a general framework that can both identify such states without prior knowledge of their microscopic scarring mechanism and determine …

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 criterion for the validity of the framework are reported: first, merely a properly defined local spectral gap of …

Polarization-dependent angularly selective dielectric reflector

Hyosim Yang, Ki Young Lee, Sanghyeok Park, Jiho Noh et autres

This repository contains the experimental and simulation data associated with the following Nature Communications paper: Polarization-dependent angularly selective dielectric reflector [https://doi.org/10.1038/s41467-026-77529-6].

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Polarization-dependent angularly selective dielectric reflector

Hyosim Yang, Ki Young Lee, Sanghyeok Park, Jiho Noh et autres

This repository contains the experimental and simulation data associated with the following Nature Communications paper: Polarization-dependent angularly selective dielectric reflector [https://doi.org/10.1038/s41467-026-77529-6].

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Efficient local classification of parity-based material topology

Anonymous, Ichitaro Yamazaki, Christopher Siefert, Iain Duff et autres

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Integrated Laser-Material Interaction and PIC-DSMC Simulation of Laser-Triggered Vacuum Switches

Chris H. Moore, Weng W. Chow, Andrew Fierro, Alexander Cerjan

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PIC-DSMC Simulations of Laser Triggered High Voltage Switches Utilizing Metasurfaces

Chris H. Moore, Ki Young Lee, Weng Chow, Alexander Cerjan

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Doubly topological harmonic generation

Kaushik Kudtarkar, Xinyi Wang, Yunjo Jeong, Chloe F. Doiron et autres

The proposition that band geometry alone can protect optical states against disorder has proven not merely theoretically elegant but experimentally incontrovertible. A key attribute of photonic topological systems is their capacity to simultaneously possess high-intensity excitations at multiple distinct frequencies that are …

Doubly topological harmonic generation

Kaushik Kudtarkar, Xinyi Wang, Yunjo Jeong, Chloe F. Doiron et autres

The proposition that band geometry alone can protect optical states against disorder has proven not merely theoretically elegant but experimentally incontrovertible. A key attribute of photonic topological systems is their capacity to simultaneously possess high-intensity excitations at multiple distinct frequencies that are …

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Band Unfolding via the Quadratic Pseudospectrum

Christopher A. Bairnsfather, Ralph M. Kaufmann, Terry A. Loring, Alexander Cerjan

Band theory provides the foundation for understanding electronic structure in crystalline materials, but its reliance on exact translational symmetry limits its applicability to systems with defects, disorder, incommensurate modulations, or large unit cells. Here, we introduce a band unfolding framework that directly …