1.8k citations · 4.9k across the 42 of their papers we have counts for
43 papers
Cascaded Brillouin-Kerr microcombs in surface nanoscale axial photonic resonators
Emily Eadie, Juan Diego Mazo-Vásquez, Sophia Padvaiskas +3
Surface nanoscale axial photonic resonators (SNAPRs) provide an axially structured whispering-gallery-mode platform in which nanoscale effective-radius variations produce spatially…
Exact solutions of nonreciprocal Su-Schrieffer-Heeger model with domain walls
Tong Wang, Mengjie Yang, Flore K. Kunst
We investigate domain-wall physics in a non-Hermitian Su-Schrieffer-Heeger model featuring the non-Hermitian skin effect and its higher-dimensional extensions, focusing on analytic…
Autoregressive Projective Quantum Monte Carlo: From a Hermitian to a Non-Hermitian Perspective
Lavoisier Wah, Remmy Zen, Flore K. Kunst
Accurately determining the ground-state properties of quantum many-body systems remains a central challenge. In this work, we introduce an autoregressive projective quantum Monte C…
Many-Body Mobility Edge and Non-Hermitian Skin Effect in an Interacting Quasi-Periodic Spin Chain
Lavoisier Wah, Ayan Banerjee, Flore K. Kunst
Non-Hermitian many-body physics reveals a rich interplay between topology, localization, and boundary effects, yet their collective behavior in interacting disordered systems remai…
Bridging Frustration and Non-Hermiticity via COMPASS: An Adaptive Biorthogonal Neural Quantum State Framework
Lavoisier Wah, Flore K. Kunst, Mohamed Hibat-Allah
In this work, we introduce a complementary optimization method for progressive and adaptive state search (COMPASS) based on biorthogonal adaptive recurrent neural quantum states. O…
Spectral-topology-induced criticality in non-Hermitian fermionic metals
Ayan Banerjee, Julius T. Gohsrich, Flore K. Kunst
Quantum matter emerges from the interplay of fluctuations, topology, and entanglement, which - in equilibrium - governs quantized transport, universal criticality, and topological…
Higher-order exceptional points in a multimode continuum optoacoustic system
Anton Montag, Julius T. Gohsrich, Quentin Levoy +2
Exceptional points appear in non-Hermitian systems as degeneracies, where not only eigenvalues but also eigenvectors coalesce. They are of great theoretical and experimental intere…
Multi-dimensional parameter space of higher-order exceptional points induced by Brillouin optoacoustics
Grigorii Slinkov, Anton Montag, Julius T. Gohsrich +4
Exceptional points (EPs) are degeneracies in the spectrum of non-Hermitian systems, where both the eigenvalues and eigenvectors coalesce. In the vicinity of an n-th order EP, the e…
Atom-Photon Bound States in Fractal Photonic Lattices: Localization Length and Anomalous Diffusion
Florian Bönsel, Flore K. Kunst, Federico Roccati
We study atom-photon bound states seeded by two-level emitters coupled to self-similar photonic lattices. By expressing the photonic Green's function through the heat kernel, we sh…
From order to chaos in a chip-scale Kerr parametric oscillator
Luca O. Trinchão, Juan Diego Mazo-Vásquez, Miguel Nienstedt +13
Integrated photonics has enabled a wide class of chip-scale light sources and quantum technologies. Within this field, microresonator-based degenerate optical parametric oscillator…
Birefringent Curvature Control of Surface Plasmons and Collective Emission
Florian Bönsel, Flore K. Kunst
We present a generic wave equation for surface plasmon polaritons on any macroscopically curved metal-dielectric interface, with isotropic and anisotropic geometric potentials line…
An Algebraic Approach to Bifurcations in Kerr Ring and Fabry-Perot Resonators
Juan Diego Mazo-Vasquez, Julius T. Gohsrich, Flore K. Kunst +1
Nonlinear phenomena such as optical bistability and spontaneous symmetry breaking play a central role in Kerr resonators, and are increasingly exploited in photonic integrated circ…
Color symmetry breaking in a nonlinear optical microcavity
Luca O. Trinchão, Alekhya Ghosh, Arghadeep Pal +8
Spontaneous symmetry breaking leads to diverse phenomena across the natural sciences, from the Higgs mechanism in particle physics to superconductors and collective animal behavior…
Multiple many-body localization transitions in a driven non-Hermitian quasiperiodic chain
Sanchayan Banerjee, Ayan Banerjee, Tapan Mishra +1
We investigate the fate of a many-body localized phase in a non-Hermitian quasiperiodic model of hardcore bosons subjected to periodic driving. While in general, the many-body loca…
The analytically tractable zoo of similarity-induced exceptional structures
Anton Montag, Jordan Isaacs, Marcus Stålhammar +1
Exceptional points (EPs) are non-Hermitian spectral degeneracies marking a simultaneous coalescence of eigenvalues and eigenvectors. Despite the fact that multiband -fold EPs (E…
Fibonacci Waveguide Quantum Electrodynamics
Florian Bönsel, Flore K. Kunst, Federico Roccati
Waveguide quantum electrodynamics (QED) provides a powerful framework for engineering quantum interactions, traditionally relying on periodic photonic arrays with continuous energy…
Many-Body Neural Network Wavefunction for a Non-Hermitian Ising Chain
Lavoisier Wah, Remmy Zen, Flore K. Kunst
Non-Hermitian (NH) quantum systems have emerged as a powerful framework for describing open quantum systems, non-equilibrium dynamics, and engineered quantum optical materials. How…
Exceptional, but Separate: Precursors to Spontaneous Symmetry Breaking
Lewis Hill, Julius T. Gohsrich, Alekhya Ghosh +3
Spontaneous symmetry breaking (SSB) and exceptional points (EPs) are often assumed to be inherently linked. Here we investigate the intricate relationship between SSB and specific…
Exceptional Points and Stability in Nonlinear Models of Population Dynamics having symmetry
Alexander Felski, Flore K. Kunst
Nonlinearity and non-Hermiticity, for example due to environmental gain-loss processes, are a common occurrence throughout numerous areas of science and lie at the root of many rem…
The non-Hermitian skin effect: A perspective
Julius T. Gohsrich, Ayan Banerjee, Flore K. Kunst
The non-Hermitian (NH) skin effect is a truly NH feature, which manifests itself as an accumulation of states, known as skin states, on the boundaries of a system. In this perspect…
Spectral Riemann Sheet Topology of Gapped Non-Hermitian Systems
Anton Montag, Alexander Felski, Flore K. Kunst
We show topological configurations of the complex-valued spectra in gapped non-Hermitian systems. These arise when the distinctive EPs in the energy Riemann sheets of such models a…
Exceptional points of any order in a generalized Hatano-Nelson model
Julius T. Gohsrich, Jacob Fauman, Flore K. Kunst
Exceptional points (EPs) are truly non-Hermitian (NH) degeneracies where matrices become defective. The order of such an EP is given by the number of coalescing eigenvectors. On th…
Essential implications of similarities in non-Hermitian systems
Anton Montag, Flore K. Kunst
In this paper, we show that three different generalized similarities enclose all unitary and anti-unitary symmetries that induce exceptional points in lower-dimensional non-Hermiti…
Symmetry-induced higher-order exceptional points in two dimensions
Anton Montag, Flore K. Kunst
Exceptional points of order (EPs) appear in non-Hermitian systems as points where the eigenvalues and eigenvectors coalesce. They emerge if real constraints are imp…