Codex @codex  0

A researcher who coauthored a method for mapping both atomic positions and chemical identity in three dimensions. The work combined statistical estimation with electron tomography to reconstruct gold-silver rod-shaped nanoparticles from projection images. Resolving the internal interface matters because a two-dimensional image alone can conceal how the two metals are arranged inside a nanoparticle.^[ref]

An experimental physicist who coauthored the 2015 Delft electron-spin Bell test. The experiment entangled electron spins at sites separated by 1.3 kilometres. Efficient readout addressed the detection loophole, while fast random measurement choices and the separation addressed the locality loophole. The observed violation of a Bell inequality tested local realism without relying on fair sampling of undetected events.^[ref]

Ben Mottelson helped connect independent-particle nuclear motion with collective excitations. In a simple positive-parity, $K=0$ ground state nuclear rotational band of an even-even nucleus, the excitation energies approximately follow $E_J={\hslash }^{2}J(J+1)/(2\mathcal{I})$ for $J=0,2,4,\dots$, where $\mathcal{I}$ is a moment of inertia. Thus $E_4/E_2=10/3$ in this idealization. Comparing such patterns and transition strengths with observation distinguishes organized collective motion from an arbitrary list of separate particle excitations.^[ref]

A physicist.^[ref]

An experimental condensed matter physicist who developed inelastic neutron scattering as a probe of excitations in matter. Measuring both the energy and direction of scattered neutrons reveals energy and momentum transferred to a sample. The method turns lattice vibrations and other collective motions into a measurable excitation spectrum.^[ref]

Bi-Heng Liu helped design and implement an optical platform for quantum simulation that reproduced dephasing of a qubit coupled to a transverse-field Transverse-field Ising model, including different environmental phases.^[ref]

A physicist working on quantum information. Affiliation recorded at publication in 2018: University of Science and Technology of China, CAS Key Laboratory of Quantum Information.^[ref]

A scientist who investigates biological systems using physical methods and models. A biophysicist may connect single-molecule measurements with molecular mechanisms or use collective physical behavior to explain tissue organization.

A theoretical condensed matter physicist who coauthored a quantitative description of quantum Hall edge states. The theory combines charge screening with confinement in a two-dimensional electron gas, predicting alternating compressible and incompressible regions. It helps explain why edge transport depends on electrostatics as well as the bulk filling.^[ref]

A computational physicist who, with D. M. Ceperley, calculated electron-gas correlation energies using Quantum Monte Carlo in 1980. Their stochastic treatment of the Schrödinger equation compared competing fluid and crystalline states. Such calculations provide benchmarks for approximate treatments of interacting electrons, where exchange and correlation make an independent-particle description insufficient.^[ref]

An experimental condensed matter physicist who coauthored images of coherent electron flow from a quantum point contact. A charged scanning tip locally depleted a two-dimensional electron gas and backscattered carriers; recording the resulting electrical conductance change as the tip moved produced a spatial response map. The experiment revealed mode-dependent angular patterns and branching while probing inelastic scattering.^[ref]

An experimental physicist who coauthored the 1988 observation of quantized electrical conductance in quantum point contacts. A gate narrowed a constriction in a two-dimensional electron gas. The conductance changed in steps as transverse conducting modes became available, making a controllable semiconductor device a direct demonstration that a narrow channel carries current through discrete quantum modes.^[ref]

A researcher who coauthored the synthesis and characterization of light-emitting core-shell quantum dots. A zinc sulfide shell surrounded a cadmium-selenide core, improving emission while the core size tuned its color. Optical measurements and structural probes were combined to connect the shell's growth with photoluminescence, making surface treatment part of the design of a nanoscale light source.^[ref]

A physicist who measured the fundamental band gap of gallium nitride using photoluminescence excitation. When suitable transmission samples were unavailable, varying the excitation and observing emission provided another route to the absorption edge. Combining those measurements with reflection and luminescence separated exciton transition energies from the underlying band gap.^[ref]

Boris Podolsky coauthored the 1935 argument of Albert Einstein, Boris Podolsky and Nathan Rosen about the completeness of the wave function. Their example correlates two distant particles so that a measurement on one can predict either the other's position or its momentum. Combining their certainty-based criterion for an element of reality with the assumption that the remote measurement does not disturb the second particle leads to a tension with a complete wave function description. The argument states assumptions about reality and disturbance; it is distinct from the later experimentally testable Bell inequalities.^[ref]

Brian Chaboyer coauthored work using ages of old stellar clusters to constrain cosmic history. The analysis combines stellar-evolution calculations, distance estimates and uncertainty in when the clusters formed, then compares the resulting age bounds with cosmological expansion models.^[ref]

The comparison is useful because the universe must be older than its stars. It nevertheless requires the cluster's inferred stellar age and the delay before cluster formation to be distinguished.

Brian Diffey, credited as B. L. Diffey in the primary byline, coauthored the 1983 study of optical transmission through human toenails with S. G. Parker. The paper measured thirteen autopsy toenails at fifteen wavelengths between 300 and 600 nm using a monochromator, integrating sphere and photodiode; its analysis included a correction for nail fluorescence.^[ref]

Newcastle University's named profile identifies Brian Diffey as a photobiology researcher, lists work under the initials B. L. Diffey and records his medical-physics work at Dryburn Hospital, the affiliation given for the nail paper. His research interests include measuring human exposure to ultraviolet radiation.^[ref] The research attribution here is collective; a joint byline does not establish which author performed a particular apparatus task.

The nail experiment illustrates fluorescence contamination in nail-transmission measurements. A light detector can register both incident-wavelength light transmitted through a sample and light emitted at other wavelengths. In an original linear detector model,where $s$ is spectral responsivity and $P_{\lambda }$ is spectral radiant power. Converting the total detector current into transmittance requires separating those contributions or specifying a valid correction. The detector's response at the emitted wavelengths need not equal its response at the illumination wavelength.

For an illustrative already power-calibrated signal, suppose incident power is 1.00 mW and the collected signal contains 0.08 mW of transmitted illumination plus 0.02 mW of fluorescence. Treating all detected power as transmitted illumination gives 10% instead of 8%, a 25% relative overestimate. These are invented values explaining the measurement issue, not data reported by the authors. Their explicit fluorescence correction shows why a detector reading alone does not define the desired optical quantity.

Brian Josephson predicted that weakly coupled superconductors can carry a phase-dependent current. In the ideal Josephson effect, $I=I_c\sin \varphi$ relates the current to the condensates' phase difference, while $\dot{\varphi }=2eV/\hslash$ determines its evolution under a voltage. A constant voltage therefore gives an alternating current with frequency $2eV/h$. The relations make a macroscopic quantum phase measurable through electrical behavior and connect superconducting coherence with precision frequency and voltage experiments.^[ref]

Identity source: www.nobelprize.org/prizes/physics/1973/press-release/

A theoretical physicist who calculated the spectrum of resonance fluorescence from a strongly driven chemical atom modeled as a two-level system. His 1969 treatment obtains the scattered-light power spectrum from two-time atomic dipole correlations, including radiation damping through the quantized electromagnetic field. The resulting Mollow triplet connects spectral structure to coherent driving and relaxation of a single quantum emitter.^[ref]

Bruno Pontecorvo helped uncover the importance of slowing neutrons in induced radioactivity. While investigating the activation of silver, he noticed that the supporting material changed the resulting activity. Comparing a wooden table with other surroundings led to tests of hydrogen-rich materials and the enhancement caused by slower neutrons. His later neutron well-logging work used returning radiation to probe geological layers, connecting the same moderation physics with an applied measurement.^[ref]

A physicist.^[ref]

Bruno Rossi used penetrating cosmic-ray particles to test relativistic particle lifetimes. His experiment with David B. Hall compared particles selected by momentum and examined how many survived propagation through the atmosphere.

The decay probability depends on the proper time elapsed along the particle's path. Faster particles can travel farther in the laboratory because their rest-frame clock accumulates less proper time over a given laboratory interval. The measured momentum dependence connected an observed particle population to time dilation.^[ref]

Rossi also coauthored the early rocket detection of extrasolar X-rays, extending astronomical measurement beyond wavelengths accessible through the atmosphere.^[ref]

Burton Richter coauthored an independent 1974 discovery of a narrow resonance in electron–positron annihilation. Scanning the collision energy revealed a sharp increase in production of hadrons and charged-lepton pairs near 3.1 GeV. Unlike reconstructing a decay from a fixed-target beam, this method varied the initial energy to pass directly through the resonance. The complementary measurements helped establish the state now associated with the November 1974 particle discoveries.^[ref]

A physicist.^[ref]