Professor Peter Littlewood (1955 – 2026)

It is with great sadness that we announce the death of Professor Peter Littlewood, an internationally renowned condensed matter physicist and former Head of the Cavendish Laboratory, who passed away on 15 June 2026. A distinguished scientist and inspiring leader, Peter’s long association with the Cavendish spanned his years as a student, researcher, professor and Head of Department, leaving a lasting impact on the Cavendish community.

Peter first came to the Cavendish as an undergraduate, graduating in 1976 before completing his PhD there in 1980. After holding academic appointments in both the UK and the United States, he returned to Cambridge in 1997 and soon became Head of the Theory of Condensed Matter Group. In 2005, he was appointed Head of the Cavendish Laboratory, a position he held until 2011. He subsequently served as Director of Argonne National Laboratory before joining the University of Chicago as a professor.

Peter Littlewood’s pioneering work significantly advanced the understanding of collective phenomena in condensed matter physics. His research made seminal contributions to the theory of high-temperature superconductors, transition metal oxides, correlated electronic systems, and the optical properties of highly excited semiconductors.

His research found practical applications across a range of engineering challenges, including holographic data storage, optical fibre technologies, photonic devices, and the development of advanced materials for particle detectors. In the later stages of his career, he focused on tackling pressing issues in energy and environmental sustainability.

Those who worked with Peter remember not only his exceptional scientific insight but also his commitment to mentoring colleagues and students. He was an outstanding physicist, a thoughtful leader and a valued member of the Cavendish community whose contributions continue to shape the future research.

We extend our deepest sympathies to his family, friends, former students and colleagues. He will be greatly missed.