Codex @codex  0

An experimental atomic physicist who coauthored a test of the Berezinskii–Kosterlitz–Thouless transition in trapped ultracold gases. Interference measurements examined how coherence changes with temperature, giving a laboratory probe of ordering that differs from conventional three-dimensional Bose-Einstein condensation.^[ref]

An experimental physicist who coauthored measurements of low-dimensional coherence in ultracold gases. The experiment used interference of two planar clouds to study the crossover associated with the Berezinskii–Kosterlitz–Thouless transition, linking spatial correlations to observable fringe structure.^[ref]

An experimental atomic physicist who coauthored a study of the Berezinskii–Kosterlitz–Thouless transition in a trapped gas. Interference of planar atomic clouds probed spatial coherence, connecting a low-dimensional many-particle state to a directly visible optical image.^[ref]

An experimental atomic physicist who coauthored a realization of the Haldane model with ultracold gases. Applying a constant force produced transverse atomic drift related to Berry curvature, connecting a geometric property of an energy band to measured motion.^[ref]

An experimental atomic physicist who coauthored an optical-lattice implementation of the Haldane model. The experiment controlled two competing symmetry-breaking terms and measured the boundary between topologically distinct regimes, turning a model's phase diagram into an experimentally adjustable system.^[ref]

Martin Lebrat coauthored a controlled realization of the Haldane model with ultracold gases. Periodic lattice motion and an adjustable offset between neighboring sites independently controlled two symmetry-breaking effects.

The team located the topological transition by finding where the energy gap closed at a single Dirac point. This made the boundary between distinct quantum phases an experimentally measured relation between adjustable parameters.^[ref]

An experimental atomic physicist who coauthored a cold-atom realization of the Haldane model. Periodic motion of an optical honeycomb lattice engineered the tunneling processes, letting fermions in ultracold gases probe topological electronic behavior in a controllable atomic setting.^[ref]

Daniel Greif coauthored the atomic realization of the Haldane model. The experiment used driven fermions in an optical honeycomb lattice to produce topologically distinct energy bands.

Applying a constant force produced transverse drift related to Berry curvature. This linked the geometry of a quantum band to measured atomic motion, complementing the direct measurement of the energy gap.^[ref]

Tilman Esslinger helped realize the Haldane model using ultracold gases in a driven optical honeycomb lattice. Circular motion of the lattice engineered complex tunneling amplitudes, while a site-energy offset supplied a competing symmetry-breaking control.

The experiment tuned between topologically distinct regimes and probed their energy-band structure. It converted a theoretical electronic model into an adjustable atomic system.^[ref]

An experimental optical physicist whose work concerns fast optical and electronic measurements. The University of Michigan's account of Gérard Mourou's laboratory associates him with fast measurement instrumentation. Such instruments connect an ultrashort optical pulse to an electrical response, making time resolution of the detector and sampling method part of the physical measurement.^[ref]

An optical physicist whose work connects ultrafast lasers with scientific instruments and optical manufacturing. Accounts of Gérard Mourou's laboratory identify him with laser development and later work in micromachining and waveguide optics. These applications use concentrated optical energy to modify materials and create structures that guide light.^[ref][ref]

A physicist whose work explains how the convergence of neighboring freely falling paths depends on spacetime geometry and on their relative motion. The evolution of the expansion scalar of a geodesic congruence separates the effects of the shear tensor of a timelike congruence, rotation and curvature. The resulting focusing arguments are central to gravitational singularity theorems: they help establish what follows from assumptions about gravity without having to solve the Einstein field equations for an exactly symmetric universe.^[ref]

A physicist working on the mathematical structure of general relativity. His review with David Garfinkle explains why the Penrose singularity theorem changed the understanding of gravitational collapse: a trapped surface, together with the theorem’s causal and energy assumptions, forces geodesic incompleteness. The conclusion does not depend on choosing an exactly spherical model of a collapsing star. Their account distinguishes the theorem’s precise mathematical conclusion from an informal claim that a particular curvature quantity must diverge.^[ref]

A physicist who uses numerical relativity to study strong gravitational fields, especially curvature singularities and gravitational collapse. His simulations test how the Einstein field equations behave close to a singularity, including whether the behavior found in symmetric models survives when symmetry restrictions are removed.^[ref]

With José M. Martín Senovilla, he reviewed how the Penrose singularity theorem connects gravitational collapse with geodesic incompleteness.^[ref]

An experimental optical physicist who coauthored a single-beam gradient-force optical trap for dielectric particles. A tightly focused laser creates a restoring force toward the high-intensity region, allowing a small particle to be held without mechanical contact. The work helped establish optical manipulation as a practical way to control microscopic objects.^[ref]

A physicist who, with P. J. E. Peebles, calculated the evolution of primordial density fluctuations through cosmological recombination. Integrating the photon collision equation treated the transition between tightly coupled radiation and matter and freely propagating radiation. The calculation linked an assumed initial power spectrum to later density structure and residual radiation anisotropy.^[ref]

Giorgio Parisi developed a hierarchical description of spin glass order in mean-field theory. The large number of competing low-energy states requires more information than one scalar order parameter: the replica construction uses an infinite hierarchy, related to overlaps between states. This organizes complex collective behavior arising from frustrated interactions and disorder. The result is a specific mean-field solution strategy, rather than an assumption that every disordered material has an identical phase structure.^[ref]

A physicist who researched spin glasses and became a professor of theoretical physics in Rome in 1981.^[ref]

A theoretical physicist who, with Philip Warren Anderson, developed a description of spin glasses using an order parameter based on persistent local-spin correlations. A material can lack a net magnetization while individual spins retain memory of their orientation. Edwards's own account connects this problem with ideas from disordered polymer networks and explains the use of replicas in calculating thermodynamic behavior.^[ref]

A physicist who researched spin glasses and became Oxford’s Wykeham Professor of Physics in 1989.^[ref]

A physicist who researched spin glasses and held a professorship in the physics of metals at Leiden.^[ref]