K. E. Ballantine
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View article: Negative refraction of light in an atomic medium
Negative refraction of light in an atomic medium Open
The quest to manipulate light propagation in ways not possible with natural media has driven the development of artificially structured metamaterials. One of the most striking effects is negative refraction, where the light beam deflects a…
View article: Erratum: Spontaneous symmetry breaking in frustrated triangular atom arrays due to cooperative light scattering [Phys. Rev. Research <b>4</b>, 043039 (2022)]
Erratum: Spontaneous symmetry breaking in frustrated triangular atom arrays due to cooperative light scattering [Phys. Rev. Research <b>4</b>, 043039 (2022)] Open
Received 3 November 2023DOI:https://doi.org/10.1103/PhysRevResearch.5.049004Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must ma…
View article: Spontaneous symmetry breaking in frustrated triangular atom arrays due to cooperative light scattering
Spontaneous symmetry breaking in frustrated triangular atom arrays due to cooperative light scattering Open
We demonstrate the presence of an optical phase transition with frustration-induced spontaneous symmetry breaking in a triangular planar atomic array due to cooperative light-mediated interactions. We show how the array geometry of triangl…
View article: Optical magnetism and wavefront control by arrays of strontium atoms
Optical magnetism and wavefront control by arrays of strontium atoms Open
By analyzing the parameters of electronic transitions, we show how bosonic Sr atoms in planar optical lattices can be engineered to exhibit optical magnetism and other higher-order electromagnetic multipoles that can be harnessed for wavef…
View article: Unidirectional absorption, storage, and emission of single photons in a collectively responding bilayer atomic array
Unidirectional absorption, storage, and emission of single photons in a collectively responding bilayer atomic array Open
Two-dimensional regular arrays of atoms are a promising platform for quantum networks, with collective subradiant states providing long-lived storage and collimated emission allowing for natural coherent links between arrays in free space.…
View article: Optical magnetism and wavefront control by arrays of strontium atoms
Optical magnetism and wavefront control by arrays of strontium atoms Open
By analyzing the parameters of electronic transitions, we show how bosonic Sr atoms in planar optical lattices can be engineered to exhibit optical magnetism and other higher-order electromagnetic multipoles that can be harnessed for wavef…
View article: Quantum Single-Photon Control, Storage, and Entanglement Generation with Planar Atomic Arrays
Quantum Single-Photon Control, Storage, and Entanglement Generation with Planar Atomic Arrays Open
While artificially fabricated patterned metasurfaces are providing\nparadigm-shifting optical components for classical light manipulation, strongly\ninteracting, controllable, and deterministic quantum interfaces between light\nand matter …
View article: Unidirectional absorption, storage, and emission of single photons in a collectively responding bilayer atomic array
Unidirectional absorption, storage, and emission of single photons in a collectively responding bilayer atomic array Open
Two-dimensional regular arrays of atoms are a promising platform for quantum networks, with collective subradiant states providing long-lived storage and collimated emission allowing for natural coherent links between arrays in free space.…
View article: Cooperative optical wavefront engineering with atomic arrays
Cooperative optical wavefront engineering with atomic arrays Open
Natural materials typically interact weakly with the magnetic component of light which greatly limits their applications. This has led to the development of artificial metamaterials and metasurfaces. However, natural atoms, where only elec…
View article: Parity-time symmetry and coherent perfect absorption in a cooperative atom response
Parity-time symmetry and coherent perfect absorption in a cooperative atom response Open
Parity-Time ( P T $\mathcal{P}\mathcal{T}$ ) symmetry has become an important concept in the design of synthetic optical materials, with exotic functionalities such as unidirectional transport and nonreciprocal reflection. At exception…
View article: Optical Magnetism and Huygens’ Surfaces in Arrays of Atoms Induced by Cooperative Responses
Optical Magnetism and Huygens’ Surfaces in Arrays of Atoms Induced by Cooperative Responses Open
By utilizing strong optical resonant interactions in arrays of atoms with electric dipole transitions, we show how to synthesize collective optical responses that correspond to those formed by arrays of magnetic dipoles and other multipole…
View article: Radiative Toroidal Dipole and Anapole Excitations in Collectively Responding Arrays of Atoms
Radiative Toroidal Dipole and Anapole Excitations in Collectively Responding Arrays of Atoms Open
A toroidal dipole represents an often overlooked electromagnetic excitation distinct from the standard electric and magnetic multipole expansion. We show how a simple arrangement of strongly radiatively coupled atoms can be used to synthes…
View article: Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array
Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array Open
We show how an initial localized radiative excitation in a two-dimensional array of cold atoms can be converted into highly directional coherent emission of light by protecting the spreading of the excitation across the array in a subradia…
View article: Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array
Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array Open
We show how an initial localized radiative excitation in a two-dimensional array of cold atoms can be converted into highly-directional coherent emission of light by protecting the spreading of the excitation across the array in a subradia…
View article: Optical eigenmode description of single-photon light-matter interactions
Optical eigenmode description of single-photon light-matter interactions Open
When light scatters from an object, it can impart some physical quantity such as momentum or angular momentum. This can act as a measurement on the photon, which collapses on to an eigenstate of the measurement operator. However the corres…
View article: Generalized classes of continuous symmetries in two-mode Dicke models
Generalized classes of continuous symmetries in two-mode Dicke models Open
As recently realized experimentally [L\\'eonard et al., Nature 543, 87\n(2017)], one can engineer models with continuous symmetries by coupling two\ncavity modes to trapped atoms, via a Raman pumping geometry. Considering\nspecifically cas…
View article: Tunable-Range, Photon-Mediated Atomic Interactions in Multimode Cavity QED
Tunable-Range, Photon-Mediated Atomic Interactions in Multimode Cavity QED Open
Optical cavity QED provides a platform with which to explore quantum\nmany-body physics in driven-dissipative systems. Single-mode cavities provide\nstrong, infinite-range photon-mediated interactions among intracavity atoms.\nHowever, the…
View article: Meissner-like Effect for a Synthetic Gauge Field in Multimode Cavity QED
Meissner-like Effect for a Synthetic Gauge Field in Multimode Cavity QED Open
Previous realizations of synthetic gauge fields for ultracold atoms do not allow the spatial profile of the field to evolve freely. We propose a scheme which overcomes this restriction by using the light in a multimode cavity with many nea…
View article: There are many ways to spin a photon: Half-quantization of a total optical angular momentum
There are many ways to spin a photon: Half-quantization of a total optical angular momentum Open
Photons can have a half-integer angular momentum.