A5034654481- Topological Materials and Phenomena
- Photonic Crystals and Applications
- Quantum optics and atomic interactions
- Metamaterials and Metasurfaces Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum many-body systems
- Random lasers and scattering media
- Orbital Angular Momentum in Optics
- Mechanical and Optical Resonators
- Quantum Mechanics and Non-Hermitian Physics
- Strong Light-Matter Interactions
- Interconnection Networks and Systems
- Photonic and Optical Devices
- Quantum Mechanics and Applications
- Neural Networks and Reservoir Computing
- Quantum Electrodynamics and Casimir Effect
- Advanced Condensed Matter Physics
- Parallel Computing and Optimization Techniques
- Radioactive Decay and Measurement Techniques
- Distributed systems and fault tolerance
- Graphene research and applications
Donostia International Physics Center
2019-2025
ETH Zurich
2024-2025
Instituto de Física Teórica
2024
Axions, hypothetical elementary particles that remain undetectable in nature, can arise as quasiparticles three-dimensional crystals known axion insulators. Previous implementations of insulators have largely been limited to two-dimensional systems, leaving their topological properties three dimensions unexplored experiment. Here, we realize an insulator a photonic crystal and probe its properties. Demonstrated features include half-quantized Chern numbers on each surface resembles...
Abstract The field of topological photonics emerged as one the most promising areas for applications in transformative technologies: possible are lasers or quantum optics interfaces. Nevertheless, efficient and simple methods diagnosing topology optical systems remain elusive an important part community. Herein, a summary numerical to calculate invariants emerging from propagation light photonic crystals is provided. fundamental properties wave lattices with space‐dependent periodic electric...
The chiral surface states of Weyl semimetals have an open Fermi called a arc. At the interface between two semimetals, these arcs are predicted to hybridize and alter their connectivity. In this Letter, we numerically study one-dimensional (1D) dielectric trilayer grating where relative displacements adjacent layers play role synthetic momenta. lattice emulates 3D crystals without time-reversal symmetry, including semimetal, nodal line Chern insulator. Besides showing phase transition...
Axion insulators are 3D magnetic topological supporting hinge states and quantized magnetoelectric effects, recently proposed for detecting dark-matter axionic particles via their excitations. Beyond theoretical interest, obtaining a photonic counterpart of axion offers potential advancing magnetically-tunable devices haloscopes based on axion-photon conversion. This work proposes an phase within setup. By building inversion-symmetric domain-walls in gyrotropic crystals, we bind chiral modes...
Time Reversal Symmetry (TRS) broken topological phases provide gapless surface states protected by topology, regardless of additional internal symmetries, spin or valley degrees freedom. Despite the numerous demonstrations 2D phases, few examples 3D systems with TRS breaking exist. In this article, we devise a general strategy to design Chern insulating (3D CI) cubic photonic crystals in weakly environment orientable and arbitrarily large vectors. The designs display topologically chiral...
The field of topological photonics has been on the rise due to its versatility in manufacturing and applications as lasers or unidirectional waveguides. Contrary 1D 2D photonic crystals, transversal vectorial nature light 3D precludes using standard methods for diagnosing topology. This tutorial describes problems that emerge computing invariants crystals diverse strategies overcoming them. Firstly, we introduce fundamentals propagation periodic media expose complications directly...
Abstract In 2D Chern insulators, the topology of bulk states is captured by a topological invariant, number. The scalar bulk‐boundary correspondence (sBBC) relates change in number across an interface with 1D chiral edge modes at interface. However, 3D insulators (3D CIs) can be characterized vector and more general (vBBC) needed to correctly predict propagation surface modes. this work possible interfaces between photonic CIs are explored, focusing on changes orientation. To formulate vBBC,...
Tight-binding models can accurately predict the band structure and topology of crystalline systems they have been heavily used in solid-state physics due to their versatility low computational cost. It is quite straightforward build an accurate tight-binding model any system using maximally localized Wannier functions crystal as a basis. In 1D 2D photonic crystals, it possible express wave equation two decoupled scalar eigenproblems where finding basis feasible standard Wannierization...
We provide an insight into the origin of phenomena reported 40 years ago by Kerker []. show that impedance and refractive index matching conditions, discussed in Secs. II IV seminal paper, are intertwined both lead to conservation a Casimir invariant. derive our results starting from theory representations Poincaré group, as it is on which one most elemental descriptions electromagnetic waves based. fundamental features continuous material environments can be derived applying...
Dual scatterers preserve the helicity of an incident field, whereas antidual flip it completely. In this setting linear electromagnetic scattering theory, we provide a completely general proof on nonexistence passive scatterers. However, show that fulfilling refractive index matching condition fields very efficiently without being in contradiction with law energy conservation. Moreover, find is paired impedance several contexts electromagnetism and, particular, within Fresnel's and Mie's...
<title>Abstract</title> Axion insulators are 3D magnetic higher-order topological protected by inversion symmetry that exhibit hinge-localized chiral channels and induce quantized magnetoelectric effects. Recent research has suggested axion may be capable of detecting dark-matter axion-like particles coupling to their axionic excitations. Beyond its fundamental theoretical interest, designing a photonic insulator offers the potential enable development magnetically-tunable switch devices...
Designing topological materials with specific indices is a complex inverse problem, traditionally tackled through manual, intuition-driven methods that are neither scalable nor efficient for exploring the vast space of possible material configurations. In this work, we develop an algorithm leverages covariance matrix adaptation evolution strategy to optimize Fourier representation periodic functions shaping designer material's characteristics. This includes mass profiles or dielectric...
Dual scatterers preserve the helicity of an incident field, whereas antidual flip it completely. In this setting linear electromagnetic scattering theory, we provide a completely general proof on non-existence passive scatterers. However, show that fulfilling refractive index matching condition fields very efficiently without being in contradiction with law energy conservation. Moreover, find is paired impedance several contexts electromagnetism and, particular, within Fresnel's and Mie's...
Axion insulators are 3D magnetic higher-order topological protected by inversion-symmetry that exhibit hinge-localized chiral channels and induce quantized magnetoelectric effects. Recent research has suggested axion may be capable of detecting dark-matter axion-like particles coupling to their axionic excitations. Beyond its fundamental theoretical interest, designing a photonic AXI offers the potential enable development magnetically-tunable switch devices through manipulation modes...
We provide an insight into the origin of phenomena reported 40 years ago by Kerker, Wang and Giles (Journal Optical Society America, 73, 6, pp. 765-767, (1983)). show that impedance refractive index matching conditions, discussed in Sections II IV seminal paper, are intimately related with space-time symmetries. derive our results starting from theory representations Poincaré group, as it is on which one most elemental descriptions electromagnetic waves based. fundamental features material...
In 2D Chern insulators (2D CI), the topology of bulk states is captured by a topological invariant, number. The scalar bulk-boundary correspondence (sBBC) relates change in number across an interface with 1D chiral edge modes at interface. However, 3D (3D CI) can be characterized vector C = (Cx, Cy, Cz) and more general (vBBC) needed to correctly predict propagation surface modes. this work possible interfaces between photonic CIs are explored, focusing on changes orientation. To formulate...
The chiral surface states of Weyl semimetals have an open Fermi called arc. At the interface between two semimetals, these arcs are predicted to hybridize and alter their connectivity. In this letter, we numerically study a one-dimensional (1D) dielectric trilayer grating where relative displacements adjacent layers play role synthetic momenta. lattice emulates 3D crystals without time-reversal symmetry, including semimetal, nodal line Chern insulator. Besides showing phase transition...
Abstract Time Reversal Symmetry (TRS) broken topological phases provide gapless surface states protected by topology, regardless of additional internal symmetries, spin or valley degrees freedom. Despite the numerous demonstrations 2D phases, few examples 3D systems with TRS breaking exist. In this article, we devise a general strategy to design Chern insulating (3D CI) cubic photonic crystals in weakly environment orientable and arbitrarily large vectors. The designs display topologically...
Topological states of matter were first discovered in the field solid-state physics but recent contributions are proving their existence diverse fields science. To mention a few, topological surface have been recently identified optics [1] , acoustics [2] and excitonic polaritonic materials [3] .