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# 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 is proud to announce that two of its alumni shared in the 2016 **Nobel Prize in Physics**. Prof. David J. Thouless moved from DAMTP to take up a lectureship in the Solid State Theory group (the early incarnation of TCM) from 1964-65 before moving to Birmingham. Later, David returned to TCM as a Royal Society Professor, moving soon after to the University of Washington. Fortunately, he remained a frequent Summer visitor to the group. Prof. F. Duncan M. Haldane was a graduate student in TCM working under the supervision of another Nobel Laureate from the group, Prof. Philip Anderson, and receiving his PhD in 1978 before transferring to the Institut Laue-Langevin. Together with Cavendish graduate Prof. J. Michael Kosterlitz, they received the Nobel Prize "for theoretical discoveries of topological phase transitions and topological phases of matter".

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More seminars- Extensive Proliferation of a Subset of Differentiated, Yet Plastic, Medial Vascular Smooth Muscle Cells Contribute to Neointimal Formation in Mouse Injury and Atherosclerosis Models. Circ Res (2016)
- Triple-Resonant Brillouin Light Scattering in Magneto-Optical Cavities. Phys Rev Lett 117 133602 (2016)
- Observation and coherent control of interface-induced electronic resonances in a field-effect transistor. Nat. Mater. (2016)
- Out-of-equilibrium dynamics and extended textures of topological defects in spin ice Phys. Rev. B 94 104416 (2016)
- Studying the role of cooperative hydration in stabilizing folded protein states. J, Struct. Biol. (2016)
- Carbon nitride frameworks and dense crystalline polymorphs Phys. Rev. B 94 094104 (2016)
- Free coherent spinons in quantum square ice Phys. Rev. B 94 104401 (2016)
- Exploring the role of water in molecular recognition: predicting protein ligandability using a combinatorial search of surface hydration sites. J. Phys. - Condens. Mat. 28 344007 (2016)
- Synthetic dimensions in the strong-coupling limit: Supersolids and pair superfluids Phys. Rev. A 94 023630 (2016)
- A single dividing cell population with imbalanced fate drives oesophageal tumour growth. Nat. Cell Biol. (2016)
- Defining the clonal dynamics leading to mouse skin tumour initiation. Nature 536 298 - 303 (2016)
- Raman scattering in correlated thin films as a probe of chargeless surface states Phys. Rev. B 94 060408 (2016)
- Genuine Quantum Signatures in Synchronization of Anharmonic Self-Oscillators. Phys. Rev. Lett. 117 073601 (2016)
- Nondeterministic self-assembly with asymmetric interactions Phys. Rev. E 94 022404 (2016)
- Floquet approach to bichromatically driven cavity-optomechanical systems Phys. Rev. A 94 023803 (2016)
- Report on the sixth blind test of organic crystal structure prediction methods. Acta Crystallogr. B 72 439 - 459 (2016)
- Finite-wavelength surface-tension-driven instabilities in soft solids, including instability in a cylindrical channel through an elastic solid. Phys. Rev. E 94 023107 (2016)
- Synthesis and stability of xenon oxides Xe2O5 and Xe3O2 under pressure. Nature Chem. 8 784 - 790 (2016)
- Jastrow correlation factor for periodic systems Phys. Rev. B 94 (2016)
- Vibrational effects on surface energies and band gaps in hexagonal and cubic ice. J. Chem. Phys. 145 044703 (2016)

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 is proud to announce that two of its alumni shared in the 2016 **Nobel Prize in Physics**. Prof. David J. Thouless moved from DAMTP to take up a lectureship in the Solid State Theory group (the early incarnation of TCM) from 1964-65 before moving to Birmingham. Later, David returned to TCM as a Royal Society Professor, moving soon after to the University of Washington. Fortunately, he remained a frequent Summer visitor to the group. Prof. F. Duncan M. Haldane was a graduate student in TCM working under the supervision of another Nobel Laureate from the group, Prof. Philip Anderson, and receiving his PhD in 1978 before transferring to the Institut Laue-Langevin. Together with Cavendish graduate Prof. J. Michael Kosterlitz, they received the Nobel Prize "for theoretical discoveries of topological phase transitions and topological phases of matter".

## Recent Publications

- Extensive Proliferation of a Subset of Differentiated, Yet Plastic, Medial Vascular Smooth Muscle Cells Contribute to Neointimal Formation in Mouse Injury and Atherosclerosis Models. Circ Res (2016)
- Triple-Resonant Brillouin Light Scattering in Magneto-Optical Cavities. Phys Rev Lett 117 133602 (2016)
- Observation and coherent control of interface-induced electronic resonances in a field-effect transistor. Nat. Mater. (2016)
- Out-of-equilibrium dynamics and extended textures of topological defects in spin ice Phys. Rev. B 94 104416 (2016)
- Studying the role of cooperative hydration in stabilizing folded protein states. J, Struct. Biol. (2016)
- Carbon nitride frameworks and dense crystalline polymorphs Phys. Rev. B 94 094104 (2016)
- Free coherent spinons in quantum square ice Phys. Rev. B 94 104401 (2016)
- Exploring the role of water in molecular recognition: predicting protein ligandability using a combinatorial search of surface hydration sites. J. Phys. - Condens. Mat. 28 344007 (2016)
- Synthetic dimensions in the strong-coupling limit: Supersolids and pair superfluids Phys. Rev. A 94 023630 (2016)
- A single dividing cell population with imbalanced fate drives oesophageal tumour growth. Nat. Cell Biol. (2016)
- Defining the clonal dynamics leading to mouse skin tumour initiation. Nature 536 298 - 303 (2016)
- Raman scattering in correlated thin films as a probe of chargeless surface states Phys. Rev. B 94 060408 (2016)
- Genuine Quantum Signatures in Synchronization of Anharmonic Self-Oscillators. Phys. Rev. Lett. 117 073601 (2016)
- Nondeterministic self-assembly with asymmetric interactions Phys. Rev. E 94 022404 (2016)
- Floquet approach to bichromatically driven cavity-optomechanical systems Phys. Rev. A 94 023803 (2016)
- Report on the sixth blind test of organic crystal structure prediction methods. Acta Crystallogr. B 72 439 - 459 (2016)
- Finite-wavelength surface-tension-driven instabilities in soft solids, including instability in a cylindrical channel through an elastic solid. Phys. Rev. E 94 023107 (2016)
- Synthesis and stability of xenon oxides Xe2O5 and Xe3O2 under pressure. Nature Chem. 8 784 - 790 (2016)
- Jastrow correlation factor for periodic systems Phys. Rev. B 94 (2016)
- Vibrational effects on surface energies and band gaps in hexagonal and cubic ice. J. Chem. Phys. 145 044703 (2016)