# Theory of Condensed Matter

Theoretical Condensed Matter physics is about building models of physical processes, often driven by experimental data, generalising the solutions of those models to make experimental predictions, and transferring the concepts gained into other areas of research. Theory plays an important role in understanding known phenomena and in predicting new ones.

With over seventy members, the TCM Group is one of the largest research Groups in the Cavendish Laboratory, and the largest university Condensed Matter Theory group in the country. Able to trace its history back for over sixty years, it has been home to many leading theoreticians.

Starting at the first principles microscopic level - with the Schrödinger equation - many properties of materials can now be calculated with a high degree of accuracy. We work on refining and developing new calculational tools and applying them to problems in physics, chemistry, materials science and biology.

Solids often show unusual collective behaviour resulting from cooperative quantum or classical phenomena. For this type of physics a more model-based approach is appropriate, and we are using such methods to attack problems in magnetism, superconductivity, nonlinear optics, mesoscopic systems, polymers, and colloids.

Collective behaviour comes even more to the fore in systems on a larger scale. As examples, we work on self-organising structures in "soft" condensed matter systems, non-linear dynamics of interacting systems, the observer in quantum mechanics, and models of biophysical processes, from the molecular scale up to neural systems.

TCM congratulates Dr Adrien Bouhon as he leaves TCM to become an Assistant Professor at the Nordic Institute for Theoretical Physics. He will be based in the University of Stockholm, Sweden, where he will work on inverse problems in topological band structures and on the manifestations of their quantum geometry.

News archive(Click the above tab to reload the Seminars list.)

More seminars Non-Abelian Floquet braiding and anom- alous Dirac string phase in periodically driven systems

Robert-Jan Slager, Adrien Bouhon, F. Nur Ünal

Thermal conductivity of glasses: first-principles theory and applications

Michele Simoncelli, Francesco Mauri, and Nicola Marzari

Probabilistic selection and design of concrete using machine learning

Jessica C. Forsdyke,
Bogdan Zviazhynski,
Janet M. Lees,
Gareth J. Conduit

Topological polarization in twisted bilayers

Daniel Bennett,
Guarav Chaudhary,
Robert-Jan Slager,
Eric Bousquet,and
Philippe Ghosez

Light emission from strongly-driven many-body systems

Andrea Pizzi, Alexey Gorlach, Nicholas Rivera, Andreas Nunnenkamp, and Ido Kaminer.

All publications

Theoretical Condensed Matter physics is about building models of physical processes, often driven by experimental data, generalising the solutions of those models to make experimental predictions, and transferring the concepts gained into other areas of research. Theory plays an important role in understanding known phenomena and in predicting new ones.

With over seventy members, the TCM Group is one of the largest research Groups in the Cavendish Laboratory, and the largest university Condensed Matter Theory group in the country. Able to trace its history back for over sixty years, it has been home to many leading theoreticians.

Starting at the first principles microscopic level - with the Schrödinger equation - many properties of materials can now be calculated with a high degree of accuracy. We work on refining and developing new calculational tools and applying them to problems in physics, chemistry, materials science and biology.

Solids often show unusual collective behaviour resulting from cooperative quantum or classical phenomena. For this type of physics a more model-based approach is appropriate, and we are using such methods to attack problems in magnetism, superconductivity, nonlinear optics, mesoscopic systems, polymers, and colloids.

Collective behaviour comes even more to the fore in systems on a larger scale. As examples, we work on self-organising structures in "soft" condensed matter systems, non-linear dynamics of interacting systems, the observer in quantum mechanics, and models of biophysical processes, from the molecular scale up to neural systems.

## News

TCM congratulates Dr Adrien Bouhon as he leaves TCM to become an Assistant Professor at the Nordic Institute for Theoretical Physics. He will be based in the University of Stockholm, Sweden, where he will work on inverse problems in topological band structures and on the manifestations of their quantum geometry.

## Recent Publications

Non-Abelian Floquet braiding and anom- alous Dirac string phase in periodically driven systems

Robert-Jan Slager, Adrien Bouhon, F. Nur Ünal

Thermal conductivity of glasses: first-principles theory and applications

Michele Simoncelli, Francesco Mauri, and Nicola Marzari

Probabilistic selection and design of concrete using machine learning

Jessica C. Forsdyke,
Bogdan Zviazhynski,
Janet M. Lees,
Gareth J. Conduit

Topological polarization in twisted bilayers

Daniel Bennett,
Guarav Chaudhary,
Robert-Jan Slager,
Eric Bousquet,and
Philippe Ghosez

Light emission from strongly-driven many-body systems

Andrea Pizzi, Alexey Gorlach, Nicholas Rivera, Andreas Nunnenkamp, and Ido Kaminer.

All publications