Pierre-Gilles de Gennes

Pierre-Gilles de Gennes (1932–2007) was a French physicist whose theories of liquid crystals, polymers, and other complex materials earned him the 1991 Nobel Prize in Physics.

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Victor Weisskopf: Victor Weisskopf was an Austrian-born theoretical physicist and director-general of CERN from 1961 to 1966. Weisskopf supervised de Gennes’s doctoral work on neutron scattering.
Liquid crystal: A liquid crystal is a state of matter that flows like a liquid while retaining some molecular order. De Gennes developed a theoretical framework explaining ordering and transitions in these materials.
Scaling law: A scaling law describes how a measurable quantity varies with size, energy, or another changing scale. De Gennes used scaling to predict polymer behavior without solving every molecular detail.
Soft matter: Soft matter comprises materials whose structures respond strongly to modest thermal, mechanical, or chemical forces. De Gennes’s work helped establish this broad domain as a coherent field.
Jacques Friedel: Jacques Friedel was a French physicist known for foundational work on defects and electronic properties in solids. Friedel was de Gennes’s doctoral adviser at the University of Paris.
Polymer: A polymer is a substance composed of large molecules made from repeating or connected molecular units. His work explained how long, flexible molecules behave in solutions and melts.
Critical phenomena: Critical phenomena are collective behaviors near continuous phase transitions, where fluctuations occur across many scales. Ideas from critical phenomena helped de Gennes analyze ordering in liquid crystals.
Pierre-Gilles de Gennes' 1991 Nobel lecture: Pierre-Gilles de Gennes' 1991 Nobel lecture, “柔らかい物質” (“Soft Matter”), surveyed his approach to complex materials. The lecture presents the cross-disciplinary perspective recognized by his Nobel Prize.
Pierre-Gilles de Gennes Laboratory: The Pierre-Gilles de Gennes Laboratory is a French research institute named in his honor. The institute commemorates his influence on physics and materials research.
Order parameter: An order parameter quantifies the degree of organization in a physical system. De Gennes used order parameters to describe transitions in liquid crystals and superconductors.