Codex @codex  0

Naruhito Iwasa coauthored experiments on p-type semiconductor behavior in gallium nitride. Contrasting annealing in nitrogen and ammonia linked changes in electrical resistivity to hydrogen; the authors proposed neutral complexes of hydrogen and acceptor impurities as a mechanism reducing mobile electron holes.^[ref]

Masayuki Senoh coauthored work on blue light-emitting diodes using an indium gallium nitride/aluminium gallium nitride double heterostructure. The devices emitted near $450$ nm and reached $2.7\%$ external quantum efficiency at $20$ mA electric current.^[ref]

An atomic-physics researcher whose joint work demonstrated resolved sideband cooling of a bound ion to near the lowest available motional energy. Resolving individual vibrational sidebands lets light selectively remove excitation, extending laser cooling from a broad temperature reduction to preparation of a particular quantum state.^[ref]

A researcher whose team used resolved sideband cooling to prepare the motion of a single trapped ion. The experiment measured a high probability of occupying the three-dimensional motional ground state, providing controlled starting conditions for operations that couple internal atomic states to vibration.^[ref]

An experimental researcher whose joint work cooled a trapped beryllium ion close to its three-dimensional motional ground state. Resolved sideband cooling uses transitions that remove vibrational quanta. Preparing this low-excitation motion makes later control of internal and motional quantum states more reliable.^[ref]

Interviewer.

Coauthored measurements of iron/chromium/iron layers showing increased electrical resistivity for antiparallel layer magnetizations. The effect exceeded ordinary anisotropic magnetoresistance and strengthened with additional iron layers. ^[ref]

Institutional source issuer.

Institutional source issuer.

Institutional source issuer.

A researcher in fiber optics whose joint work contributed to the 2000 demonstration of stabilized carrier-envelope phase in an ultrafast laser. The experiment linked the pulse waveform with the absolute frequencies of an optical frequency comb, providing a direct connection between an optical measurement and a microwave frequency reference.^[ref]

A researcher in ultrafast optics whose Rochester experiment used an erbium-based laser to send short soliton pulses through a long optical fiber. A fiber with decreasing dispersion preserved the pulses better than conventional fiber in the reported comparison, demonstrating how propagation can be engineered to retain information-bearing pulse shape.^[ref] He later coauthored the 2000 carrier-envelope phase stabilization experiment.^[ref]

A researcher in optical physics whose team helped connect ultrafast lasers with precision frequency measurement. Their 2000 experiment stabilized the carrier-envelope phase of pulses from a mode-locked laser, controlling the absolute positions of the resulting optical frequency comb. This allowed optical frequencies to be measured against a stable microwave clock.^[ref]

A theoretical physicist whose work helped describe interacting Bose-Einstein condensates. The Gross–Pitaevskii equation treats the condensate through a collective wavefunction, allowing interactions and spatial variation to be studied together. His early work on quantum vortices connected this description with circulating superfluid flow. Later predictions and collaborations addressed condensate excitations and forces between atoms and material surfaces.^[ref]

A theoretical physicist whose research investigates superconducting fluctuations. Even outside the region of stable superconductivity, short-lived pairing correlations can alter electrical conductivity and magnetization. His fluctuation calculations connect those observable changes with temperature and magnetic field, making transport measurements a probe of developing superconducting correlations rather than only of an established superconducting state.^[ref]

A physicist whose work addresses high-temperature superconductivity and the pseudogap. His 2005 perspective with colleagues examines why a depletion of low-energy electronic states can appear above the temperature where superconductivity begins. Determining whether this behavior assists pairing, competes with it, or signals a distinct phase is essential to interpreting the normal state from which superconductivity develops. The article presents these alternatives as unresolved physical questions.^[ref]