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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 Angela Harper on receiving the American Physical Society's LeRoy Apker Award "for significant contributions to printed electronics research and outstanding leadership of the Society of Physics Students and Society of Women in STEM fields."

TCM congratulates Joseph Prentice and Tom Whitehead on successfully defending their PhD theses.

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

More seminars- Probabilistic design of a molybdenum-base alloy using a neural network Scripta Mater. 146 82 - 86 (2018)
- Electron-phonon coupling from finite differences. J Phys Condens Matter (2018)
- Harmonic Force Constants for Molecular Mechanics Force Fields via Hessian Matrix Projection. J. Chem. Theory Comput. 14 274 - 281 (2018)
- Quantum-Limited Directional Amplifiers with Optomechanics Phys. Rev. Lett. 120 023601 (2018)
- Defining murine organogenesis at single-cell resolution reveals a role for the leukotriene pathway in regulating blood progenitor formation. Nat Cell Biol (2018)
- Troy+ brain stem cells cycle through quiescence and regulate their number by sensing niche occupancy. Proc Natl Acad Sci U S A (2018)
- Ground state structure of high-energy-density polymeric carbon monoxide (vol 95, 144102, 2017) Phys. Rev. B 97 019902 (2018)
- Muscle Stem Cells Exhibit Distinct Clonal Dynamics in Response to Tissue Repair and Homeostatic Aging. Cell Stem Cell 22 119 - 127.e3 (2018)
- C2x: A tool for visualisation and input preparation for Castep and other electronic structure codes Comput. Phys. Commun. (2018)
- Phenotypes can be robust and evolvable if mutations have non-local effects on sequence constraints. J R Soc Interface 15 (2018)
- Robustness of Majorana edge modes and topological order: Exact results for the symmetric interacting Kitaev chain with disorder Phys. Rev. B 96 241113 (2017)
- Jammed Spin Liquid in the Bond-Disordered Kagome Antiferromagnet Phys. Rev. Lett. 119 247201 (2017)
- Many-Body Coarse-Grained Interactions Using Gaussian Approximation Potentials. J. Phys. Chem. B 121 10934 - 10949 (2017)
- Nonreciprocal reconfigurable microwave optomechanical circuit. Nature Comm. 8 604 (2017)
- Stopping power beyond the adiabatic approximation Scientific Reports 7 2618 (2017)
- Sir Sam Edwards. 1 February 1928 — 7 July 2015 Biogr. Mem. Fellows R. Soc. 63 243 - 271 (2017)
- Revealing and exploiting hierarchical material structure through complex atomic networks npj Computational Materials 3 35 (2017)
- Frame, metric and geodesic evolution in shape-changing nematic shells. Soft Matter 13 8858 - 8863 (2017)
- Amplitude bounds for biochemical oscillators EPL (Europhysics Letters) 119 58004 (2017)
- Simulations of water nano-confined between corrugated planes. J. Chem. Phys. 147 194509 (2017)

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 Angela Harper on receiving the American Physical Society's LeRoy Apker Award "for significant contributions to printed electronics research and outstanding leadership of the Society of Physics Students and Society of Women in STEM fields."

TCM congratulates Joseph Prentice and Tom Whitehead on successfully defending their PhD theses.

## Recent Publications

- Probabilistic design of a molybdenum-base alloy using a neural network Scripta Mater. 146 82 - 86 (2018)
- Electron-phonon coupling from finite differences. J Phys Condens Matter (2018)
- Harmonic Force Constants for Molecular Mechanics Force Fields via Hessian Matrix Projection. J. Chem. Theory Comput. 14 274 - 281 (2018)
- Quantum-Limited Directional Amplifiers with Optomechanics Phys. Rev. Lett. 120 023601 (2018)
- Defining murine organogenesis at single-cell resolution reveals a role for the leukotriene pathway in regulating blood progenitor formation. Nat Cell Biol (2018)
- Troy+ brain stem cells cycle through quiescence and regulate their number by sensing niche occupancy. Proc Natl Acad Sci U S A (2018)
- Ground state structure of high-energy-density polymeric carbon monoxide (vol 95, 144102, 2017) Phys. Rev. B 97 019902 (2018)
- Muscle Stem Cells Exhibit Distinct Clonal Dynamics in Response to Tissue Repair and Homeostatic Aging. Cell Stem Cell 22 119 - 127.e3 (2018)
- C2x: A tool for visualisation and input preparation for Castep and other electronic structure codes Comput. Phys. Commun. (2018)
- Phenotypes can be robust and evolvable if mutations have non-local effects on sequence constraints. J R Soc Interface 15 (2018)
- Robustness of Majorana edge modes and topological order: Exact results for the symmetric interacting Kitaev chain with disorder Phys. Rev. B 96 241113 (2017)
- Jammed Spin Liquid in the Bond-Disordered Kagome Antiferromagnet Phys. Rev. Lett. 119 247201 (2017)
- Many-Body Coarse-Grained Interactions Using Gaussian Approximation Potentials. J. Phys. Chem. B 121 10934 - 10949 (2017)
- Nonreciprocal reconfigurable microwave optomechanical circuit. Nature Comm. 8 604 (2017)
- Stopping power beyond the adiabatic approximation Scientific Reports 7 2618 (2017)
- Sir Sam Edwards. 1 February 1928 — 7 July 2015 Biogr. Mem. Fellows R. Soc. 63 243 - 271 (2017)
- Revealing and exploiting hierarchical material structure through complex atomic networks npj Computational Materials 3 35 (2017)
- Frame, metric and geodesic evolution in shape-changing nematic shells. Soft Matter 13 8858 - 8863 (2017)
- Amplitude bounds for biochemical oscillators EPL (Europhysics Letters) 119 58004 (2017)
- Simulations of water nano-confined between corrugated planes. J. Chem. Phys. 147 194509 (2017)