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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 congratulates Lars Schonenberg on passing his PhD viva.

Two TCM alumni, Prof. David Thouless and Prof. Duncan Haldane, share the 2016 Nobel Prize in Physics "for theoretical discoveries of topological phase transitions and topological phases of matter".

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

More seminars- Long-term, hormone-responsive organoid cultures of human endometrium in a chemically defined medium. Nat. Cell Biol. (2017)
- Ground state structure of polymeric carbon monoxide with high energy density Phys. Rev. B 95 144102 (2017)
- Stable collective dynamics of two-level systems coupled by dipole interactions Phys. Rev. A 95 (2017)
- Quantum Monte Carlo study of the energetics of the rutile, anatase, brookite, and columbite TiO2 polymorphs Phys. Rev. B 95 121108 (2017)
- Energetics of H2 clusters from density functional and coupled cluster theories Phys. Rev. B 95 115116 (2017)
- Excitons in topological Kondo insulators: Theory of thermodynamic and transport anomalies in SmB_{6}. Phys Rev Lett 118 096604 (2017)
- A combined X-ray scattering and simulation study of halothane in membranes at raised pressures Chem. Phys. Lett. 671 21 - 27 (2017)
- Water radiolysis by low-energy carbon projectiles from first-principles molecular dynamics Plos One 12 3 (2017)
- Defining stem cell dynamics and migration during wound healing in mouse skin epidermis. Nat Commun 8 14684 (2017)
- Quantum mechanics in an evolving Hilbert space Phys. Rev. B 95 115155 (2017)
- Corrigendum: Residue Geometry Networks: A Rigidity-Based Approach to the Amino Acid Network and Evolutionary Rate Analysis. Sci Rep 7 42654 (2017)
- High-pressure phases of group-II difluorides: Polymorphism and superionicity Phys. Rev. B 95 054118 (2017)
- Anatomy of quantum critical wave functions in dissipative impurity problems Phys. Rev. B 95 (2017)
- Identity and dynamics of mammary stem cells during branching morphogenesis. Nature (2017)
- Effective-range dependence of resonant Fermi gases Phys. Rev. A 95 013633 (2017)
- First-principles study of the dynamic Jahn-Teller distortion of the neutral vacancy in diamond Phys. Rev. B 95 014108 (2017)
- Appearance and Disappearance of Quantum Correlations in Measurement-Based Feedback Control of a Mechanical Oscillator Phys. Rev. X 7 011001 (2017)
- Simulations and spectra of water in CO matrices Phys. Chem. Chem. Phys. 19 7280 - 7287 (2017)
- Emergent order in the kagome Ising magnet Dy3Mg2Sb3O14. Nat Commun 7 13842 (2016)
- Temperature Dependence of the Energy Levels of Methylammonium Lead Iodide Perovskite from First-Principles. J Phys Chem Lett 7 5247 - 5252 (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 congratulates Lars Schonenberg on passing his PhD viva.

Two TCM alumni, Prof. David Thouless and Prof. Duncan Haldane, share the 2016 Nobel Prize in Physics "for theoretical discoveries of topological phase transitions and topological phases of matter".

## Recent Publications

- Long-term, hormone-responsive organoid cultures of human endometrium in a chemically defined medium. Nat. Cell Biol. (2017)
- Ground state structure of polymeric carbon monoxide with high energy density Phys. Rev. B 95 144102 (2017)
- Stable collective dynamics of two-level systems coupled by dipole interactions Phys. Rev. A 95 (2017)
- Quantum Monte Carlo study of the energetics of the rutile, anatase, brookite, and columbite TiO2 polymorphs Phys. Rev. B 95 121108 (2017)
- Energetics of H2 clusters from density functional and coupled cluster theories Phys. Rev. B 95 115116 (2017)
- Excitons in topological Kondo insulators: Theory of thermodynamic and transport anomalies in SmB_{6}. Phys Rev Lett 118 096604 (2017)
- A combined X-ray scattering and simulation study of halothane in membranes at raised pressures Chem. Phys. Lett. 671 21 - 27 (2017)
- Water radiolysis by low-energy carbon projectiles from first-principles molecular dynamics Plos One 12 3 (2017)
- Defining stem cell dynamics and migration during wound healing in mouse skin epidermis. Nat Commun 8 14684 (2017)
- Quantum mechanics in an evolving Hilbert space Phys. Rev. B 95 115155 (2017)
- Corrigendum: Residue Geometry Networks: A Rigidity-Based Approach to the Amino Acid Network and Evolutionary Rate Analysis. Sci Rep 7 42654 (2017)
- High-pressure phases of group-II difluorides: Polymorphism and superionicity Phys. Rev. B 95 054118 (2017)
- Anatomy of quantum critical wave functions in dissipative impurity problems Phys. Rev. B 95 (2017)
- Identity and dynamics of mammary stem cells during branching morphogenesis. Nature (2017)
- Effective-range dependence of resonant Fermi gases Phys. Rev. A 95 013633 (2017)
- First-principles study of the dynamic Jahn-Teller distortion of the neutral vacancy in diamond Phys. Rev. B 95 014108 (2017)
- Appearance and Disappearance of Quantum Correlations in Measurement-Based Feedback Control of a Mechanical Oscillator Phys. Rev. X 7 011001 (2017)
- Simulations and spectra of water in CO matrices Phys. Chem. Chem. Phys. 19 7280 - 7287 (2017)
- Emergent order in the kagome Ising magnet Dy3Mg2Sb3O14. Nat Commun 7 13842 (2016)
- Temperature Dependence of the Energy Levels of Methylammonium Lead Iodide Perovskite from First-Principles. J Phys Chem Lett 7 5247 - 5252 (2016)