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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.

Dr Gareth Conduit and startup Intellegens have licensed their deep learning code Alchemite™ to Optibrium for resale to clients in drug discovery. Optibrium CEO, Dr Matt Segall, who completed his PhD in TCM, comments "*their deep learning technology, already proven in the field of materials design, has shown remarkable results when applied to challenging drug discovery*".

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More seminars- Excitations in the field-induced quantum spin liquid state of alpha-RuCl3 npj Quantum Materials 3 8 (2018)
- Dynamics of a lattice gauge theory with fermionic matter-minimal quantum simulator with time-dependent impurities in ultracold gases Quantum Sci. and Tech. 3 UNSP 044003 (2018)
- Topology of one dimensional quantum systems out of equilibrium Phys. Rev. Lett. 121 090401 (2018)
- Assimilating Radial Distribution Functions To Build Water Models with Improved Structural Properties. J. Chem. Inf. Model. (2018)
- Welcoming Gallium- and Indium-Fumarate MOFs to the Family: Synthesis, Comprehensive Characterization, Observation of Porous Hydrophobicity, and CO2 Dynamics. ACS Applied Materials and Interfaces 10 28582 - 28596 (2018)
- Emergence of continuous rotational symmetries in ultracold atoms coupled to optical cavities Phys. Rev. A 98 023617 (2018)
- Erratum: Structure Prediction of Li-Sn and Li-Sb Intermetallics for Lithium-Ion Batteries Anodes (Chemistry of Materials (2017) 29:14 (5787?5795) DOI: 10.1021/acs.chemmater.6b04914) Chem. Mater. 30 5516 - 5517 (2018)
- Determinism and boundedness of self-assembling structures Phys. Rev. E 98 022113 (2018)
- Defining Lineage Potential and Fate Behavior of Precursors during Pancreas Development. Dev. Cell 46 360 - 375.e5 (2018)
- Phases of quantum dimers from ensembles of classical stochastic trajectories Phys. Rev. B 98 064302 (2018)
- Towards the systematic crystallisation of molecular ionic cocrystals: insights from computed crystal form landscapes. Faraday Disc. (2018)
- Genome-Scale Oscillations in DNA Methylation during Exit from Pluripotency. Cell Systems 7 63 - 76.e12 (2018)
- Mechanical architecture and folding of E. coli type 1 pilus domains. Nature Comm. 9 2758 (2018)
- Theory of the Josephson Junction Laser. Phys. Rev. Lett. 121 027004 (2018)
- Helium-Iron Compounds at Terapascal Pressures. Phys. Rev. Lett. 121 015301 (2018)
- Color-dependent interactions in the three coloring model Phys. Rev. B 98 024403 (2018)
- Synthetic gauge fields for lattices with multi-orbital unit cells: Routes towards a π-flux dice lattice with flat bands New J. Phys. 20 073025 (2018)
- Endoscopic ultrasound-guided choledochoduodenostomy using a lumen apposing metal stent for acute cholangitis Turk. J. Gastroenterol. 29 511 - 514 (2018)
- Sodiation and Desodiation via Helical Phosphorus Intermediates in High-Capacity Anodes for Sodium-Ion Batteries. J. Am. Chem. Soc. 140 7994 - 8004 (2018)
- Dynamical localization in Z(2) lattice gauge theories Phys. Rev. B 97 245137 (2018)

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

Dr Gareth Conduit and startup Intellegens have licensed their deep learning code Alchemite™ to Optibrium for resale to clients in drug discovery. Optibrium CEO, Dr Matt Segall, who completed his PhD in TCM, comments "*their deep learning technology, already proven in the field of materials design, has shown remarkable results when applied to challenging drug discovery*".

## Recent Publications

- Excitations in the field-induced quantum spin liquid state of alpha-RuCl3 npj Quantum Materials 3 8 (2018)
- Dynamics of a lattice gauge theory with fermionic matter-minimal quantum simulator with time-dependent impurities in ultracold gases Quantum Sci. and Tech. 3 UNSP 044003 (2018)
- Topology of one dimensional quantum systems out of equilibrium Phys. Rev. Lett. 121 090401 (2018)
- Assimilating Radial Distribution Functions To Build Water Models with Improved Structural Properties. J. Chem. Inf. Model. (2018)
- Welcoming Gallium- and Indium-Fumarate MOFs to the Family: Synthesis, Comprehensive Characterization, Observation of Porous Hydrophobicity, and CO2 Dynamics. ACS Applied Materials and Interfaces 10 28582 - 28596 (2018)
- Emergence of continuous rotational symmetries in ultracold atoms coupled to optical cavities Phys. Rev. A 98 023617 (2018)
- Erratum: Structure Prediction of Li-Sn and Li-Sb Intermetallics for Lithium-Ion Batteries Anodes (Chemistry of Materials (2017) 29:14 (5787?5795) DOI: 10.1021/acs.chemmater.6b04914) Chem. Mater. 30 5516 - 5517 (2018)
- Determinism and boundedness of self-assembling structures Phys. Rev. E 98 022113 (2018)
- Defining Lineage Potential and Fate Behavior of Precursors during Pancreas Development. Dev. Cell 46 360 - 375.e5 (2018)
- Phases of quantum dimers from ensembles of classical stochastic trajectories Phys. Rev. B 98 064302 (2018)
- Towards the systematic crystallisation of molecular ionic cocrystals: insights from computed crystal form landscapes. Faraday Disc. (2018)
- Genome-Scale Oscillations in DNA Methylation during Exit from Pluripotency. Cell Systems 7 63 - 76.e12 (2018)
- Mechanical architecture and folding of E. coli type 1 pilus domains. Nature Comm. 9 2758 (2018)
- Theory of the Josephson Junction Laser. Phys. Rev. Lett. 121 027004 (2018)
- Helium-Iron Compounds at Terapascal Pressures. Phys. Rev. Lett. 121 015301 (2018)
- Color-dependent interactions in the three coloring model Phys. Rev. B 98 024403 (2018)
- Synthetic gauge fields for lattices with multi-orbital unit cells: Routes towards a π-flux dice lattice with flat bands New J. Phys. 20 073025 (2018)
- Endoscopic ultrasound-guided choledochoduodenostomy using a lumen apposing metal stent for acute cholangitis Turk. J. Gastroenterol. 29 511 - 514 (2018)
- Sodiation and Desodiation via Helical Phosphorus Intermediates in High-Capacity Anodes for Sodium-Ion Batteries. J. Am. Chem. Soc. 140 7994 - 8004 (2018)
- Dynamical localization in Z(2) lattice gauge theories Phys. Rev. B 97 245137 (2018)