Barry Bradlyn
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View article: Signatures of Kramers-Weyl fermions in the charge density wave material (TaSe4)2I
Signatures of Kramers-Weyl fermions in the charge density wave material (TaSe4)2I Open
The quasi-one-dimensional charge density wave (CDW) material (TaSe4)2I has been recently predicted to host Kramers-Weyl (KW) fermions which should exist in the vicinity of high symmetry points in the Brillouin zone in chiral materials with…
View article: Exploring Many-Body Quantum Geometry Beyond the Quantum Metric with Correlation Functions: A Time-Dependent Perspective
Exploring Many-Body Quantum Geometry Beyond the Quantum Metric with Correlation Functions: A Time-Dependent Perspective Open
The quantum geometric tensor and quantum Fisher information have recently been shown to provide a unified geometric description of the linear response of many-body systems. However, a similar geometric description of higher-order perturbat…
View article: Dynamic competition between phason and amplitudon observed by ultrafast multimodal scanning tunneling microscopy
Dynamic competition between phason and amplitudon observed by ultrafast multimodal scanning tunneling microscopy Open
The intertwining between two ordered states that arise from the same interactions is reflected in the dynamics of their coupled collective excitations. While the equilibrium phase diagram resulting from such intertwined orders has been ext…
View article: Imaginary Time Formalism for Causal Nonlinear Response Functions
Imaginary Time Formalism for Causal Nonlinear Response Functions Open
It is well established that causal linear response functions can be found by computing the much simpler imaginary time-ordered Matsubara functions and performing an analytic continuation. This principle is the basis for much of our underst…
View article: Going /k/ommando: Gun Culture in Fringe Online Communities
Going /k/ommando: Gun Culture in Fringe Online Communities Open
The increasing frequency of mass shootings in the United States has become alarmingly common, prompting discussions about gun control. While gun control in the US involves complex legal issues, cultural factors---particularly ``gun culture…
View article: Stable Real-Space Invariants and Topology Beyond Symmetry Indicators
Stable Real-Space Invariants and Topology Beyond Symmetry Indicators Open
We show that certain band gaps, which appear topologically trivial from the perspective of symmetry indicators (SIs), must instead be topological, as guaranteed by real-space information that follows from Topological Quantum Chemistry (TQC…
View article: Quantum entanglement and quantum geometry measured with inelastic x-ray scattering
Quantum entanglement and quantum geometry measured with inelastic x-ray scattering Open
View article: Grokking vs. Learning: Same Features, Different Encodings
Grokking vs. Learning: Same Features, Different Encodings Open
Grokking typically achieves similar loss to ordinary, "steady", learning. We ask whether these different learning paths - grokking versus ordinary training - lead to fundamental differences in the learned models. To do so we compare the fe…
View article: Quantum Fisher Information Reveals UV-IR Mixing in the Strange Metal
Quantum Fisher Information Reveals UV-IR Mixing in the Strange Metal Open
The density-density response in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$ has recently been shown to exhibit conformal symmetry. Using, the experimentally inferred conformal dynamic susceptibility, we compute the resultant quantum Fish…
View article: High-pressure characterization of Ag3AuTe2: Implications for strain-induced band tuning
High-pressure characterization of Ag3AuTe2: Implications for strain-induced band tuning Open
Recent band structure calculations have suggested the potential for band tuning in the chiral semiconductor Ag3AuTe2 to zero upon application of negative strain. In this study, we report on the synthesis of polycrystalline Ag3AuTe2 and inv…
View article: Quantum entanglement and quantum geometry measured with inelastic X-ray scattering
Quantum entanglement and quantum geometry measured with inelastic X-ray scattering Open
Using inelastic X-ray scattering (IXS), we experimentally investigate the quantum geometry and quantum information in the large-gap insulator, LiF. Using sum rules for the density-density response function measured in IXS, we compute the q…
View article: Computing the $\mathbb{Z}_2$ Invariant in Two-Dimensional Strongly-Correlated Systems
Computing the $\mathbb{Z}_2$ Invariant in Two-Dimensional Strongly-Correlated Systems Open
We show that the two-dimensional $\mathbb{Z}_2$ invariant for time-reversal invariant insulators can be formulated in terms of the boundary-condition dependence of the ground state wavefunction for both non-interacting and strongly-correla…
View article: Author Correction: Axion topology in photonic crystal domain walls
Author Correction: Axion topology in photonic crystal domain walls Open
View article: Charge Susceptibility and Kubo Response in Hatsugai-Kohmoto-related Models
Charge Susceptibility and Kubo Response in Hatsugai-Kohmoto-related Models Open
We study in depth the charge susceptibility for the band Hatsugai-Kohmoto (HK) and orbital (OHK) models. As either of these models describes a Mott insulator, the charge susceptibility takes on the form of a modified density response funct…
View article: Axion topology in photonic crystal domain walls
Axion topology in photonic crystal domain walls Open
View article: Topological phase transition without single particle gap closing in strongly correlated systems
Topological phase transition without single particle gap closing in strongly correlated systems Open
Here, in this study, we show two models where changing topology does not necessarily close the bulk insulating charge gap as demanded in the standard noninteracting picture. From extensive determinantal and dynamical cluster quantum Monte …
View article: Multifold topological semimetals
Multifold topological semimetals Open
The discovery of topological semimetals with multifold band crossings has opened up a new and exciting frontier in the field of topological physics. These materials exhibit large Chern numbers, leading to long double Fermi arcs on their su…
View article: Tutorial 2.0: computing topological invariants in 3D photonic crystals
Tutorial 2.0: computing topological invariants in 3D photonic crystals Open
The field of topological photonics has been on the rise due to its versatility in manufacturing and its applications as topological lasers or unidirectional waveguides. Contrary to 1D or 2D photonic crystals, the transversal and vectorial …
View article: Anisotropy of the hydrostatic stress for Hall droplets with in-plane magnetic field
Anisotropy of the hydrostatic stress for Hall droplets with in-plane magnetic field Open
We examine the hydrostatic stress of electrons strongly confined in a quasi-2D quantum well in the presence of a strong perpendicular and weak in-plane magnetic field. This introduces anisotropy into the stress tensor which is inconsistent…
View article: High-pressure characterization of Ag$_3$AuTe$_2$: Implications for strain-induced band tuning
High-pressure characterization of Ag$_3$AuTe$_2$: Implications for strain-induced band tuning Open
Recent band structure calculations have suggested the potential for band tuning in a chiral semiconductor, Ag$_3$AuTe$_2$, to zero upon application of negative strain. In this study, we report on the synthesis of polycrystalline Ag$_3$AuTe…
View article: Uncovering the spin ordering in magic-angle graphene via edge state equilibration
Uncovering the spin ordering in magic-angle graphene via edge state equilibration Open
The flat bands in magic-angle twisted bilayer graphene (MATBG) provide an especially rich arena to investigate interaction-driven ground states. While progress has been made in identifying the correlated insulators and their excitations at…
View article: Weyl spin-momentum locking in a chiral topological semimetal
Weyl spin-momentum locking in a chiral topological semimetal Open
Spin-orbit coupling in noncentrosymmetric crystals leads to spin-momentum locking – a directional relationship between an electron’s spin angular momentum and its linear momentum. Isotropic orthogonal Rashba spin-momentum locking has been …
View article: Multifold topological semimetals
Multifold topological semimetals Open
The discovery of topological semimetals with multifold band crossings has opened up a new and exciting frontier in the field of topological physics. These materials exhibit large Chern numbers, leading to long double Fermi arcs on their su…
View article: Spectral Density and Sum Rules for Second-Order Response Functions
Spectral Density and Sum Rules for Second-Order Response Functions Open
Sum rules for linear response functions give powerful and experimentally-relevant relations between frequency moments of response functions and ground state properties. In particular, renewed interest has been drawn to optical conductivity…
View article: Competing higher order topological superconducting phases in triangular lattice magnet-superconductor hybrid systems
Competing higher order topological superconducting phases in triangular lattice magnet-superconductor hybrid systems Open
We demonstrate that a plethora of higher order topological phases emerge in magnet-superconductor hybrid (MSH) systems through the interplay of a stacked magnetic structure and an underlying triangular surface lattice; the latter being of …
View article: Charge Conservation beyond Uniformity: Spatially Inhomogeneous Electromagnetic Response in Periodic Solids
Charge Conservation beyond Uniformity: Spatially Inhomogeneous Electromagnetic Response in Periodic Solids Open
Nonlinear electromagnetic response functions have reemerged as a crucial tool for studying quantum materials, due to recently appreciated connections between optical response functions, quantum geometry, and band topology. Most attention h…
View article: Gun Culture in Fringe Social Media
Gun Culture in Fringe Social Media Open
The increasing frequency of mass shootings in the United States has, unfortunately, become a norm. While the issue of gun control in the US involves complex legal concerns, there are also societal issues at play. One such social issue is s…
View article: Spin-resolved topology and partial axion angles in three-dimensional insulators
Spin-resolved topology and partial axion angles in three-dimensional insulators Open
Symmetry-protected topological crystalline insulators (TCIs) have primarily been characterized by their gapless boundary states. However, in time-reversal- ( $${{{{{{{\mathcal{T}}}}}}}}$$ -) invariant (helical) 3D TCIs—termed higher-orde…
View article: Topological Phase Transition without Single-Particle-Gap Closing in Strongly Correlated Systems
Topological Phase Transition without Single-Particle-Gap Closing in Strongly Correlated Systems Open
We show here that numerous examples abound where changing topology does not necessarily close the bulk insulating charge gap as demanded in the standard non-interacting picture. From extensive determinantal and dynamical cluster quantum Mo…
View article: Competing Higher Order Topological Superconducting Phases in Triangular Lattice Magnet-Superconductor Hybrid Systems
Competing Higher Order Topological Superconducting Phases in Triangular Lattice Magnet-Superconductor Hybrid Systems Open
We demonstrate that a plethora of higher order topological phases emerge in magnet-superconductor hybrid (MSH) systems through the interplay of a stacked magnetic structure and an underlying triangular surface lattice; the latter being of …