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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.

We welcome Dr Karolina Milowska who has just joined the Group as a postdoc working with Prof Mike Payne using linear scaling DFT. She previously worked in the Materials Science Department.

We congratulate Dr Michael Rutter on being selected to serve for another year as President of the Cambridge Branch of the UCU.

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

More seminars- Stopping power beyond the adiabatic approximation Scientific Reports 7 2618 (2017)
- Charge density wave instabilities of type-II Weyl semimetals in a strong magnetic field Phys. Rev. B 96 201101 (2017)
- Design of a nickel-base superalloy using a neural network Mater. Des. 131 358 - 365 (2017)
- Absence of Ergodicity without Quenched Disorder: from Quantum Disentangled Liquids to Many-Body Localization Phys. Rev. Lett. 119 176601 (2017)
- Emergence and universality in the regulation of stem cell fate Curr. Opin. Syst. Biol. 5 57 - 62 (2017)
- A Unifying Theory of Branching Morphogenesis Cell 171 242 - 255 (2017)
- Nonreciprocal reconfigurable microwave optomechanical circuit. Nat Commun 8 604 (2017)
- Uncovering nonperturbative dynamics of the biased sub-Ohmic spin-boson model with variational matrix product states Phys. Rev. B 96 (2017)
- Fate mapping of human glioblastoma reveals an invariant stem cell hierarchy Nature 549 227 - 232 (2017)
- Hydrogen Clathrate Structures in Rare Earth Hydrides at High Pressures: Possible Route to Room-Temperature Superconductivity Phys. Rev. Lett. 119 107001 (2017)
- Stochastic Kuramoto oscillators with discrete phase states Phys. Rev. E 96 032201 (2017)
- Analytical Spectral Density of the Sachdev-Ye-Kitaev Model at finite N Phys. Rev. D 96 066012 (2017)
- Effective-range dependence of two-dimensional Fermi gases Phys. Rev. A 96 023619 (2017)
- Multipotent Basal Stem Cells, Maintained in Localized Proximal Niches, Support Directed Long-Ranging Epithelial Flows in Human Prostates. Cell Rep. 20 1609 - 1622 (2017)
- Particle-Hole Symmetry in the Fermion-Chern-Simons and Dirac Descriptions of a Half-Filled Landau Level Phys. Rev. X 7 031029 (2017)
- Computationally-guided optimization of small-molecule inhibitors of the Aurora A kinase-TPX2 protein-protein interaction. Chemical Communications (2017)
- Using forces to accelerate first-principles anharmonic vibrational calculations Physical Review Materials 1 023801 (2017)
- Structural properties of genotype-phenotype maps. J. Roy. Soc. Interface 14 20170275 (2017)
- Disorder-Free Localization. Phys. Rev. Lett. 118 266601 (2017)
- Persistent currents in ferromagnetic condensates Phys. Rev. B 95 224512 (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

We welcome Dr Karolina Milowska who has just joined the Group as a postdoc working with Prof Mike Payne using linear scaling DFT. She previously worked in the Materials Science Department.

We congratulate Dr Michael Rutter on being selected to serve for another year as President of the Cambridge Branch of the UCU.

## Recent Publications

- Stopping power beyond the adiabatic approximation Scientific Reports 7 2618 (2017)
- Charge density wave instabilities of type-II Weyl semimetals in a strong magnetic field Phys. Rev. B 96 201101 (2017)
- Design of a nickel-base superalloy using a neural network Mater. Des. 131 358 - 365 (2017)
- Absence of Ergodicity without Quenched Disorder: from Quantum Disentangled Liquids to Many-Body Localization Phys. Rev. Lett. 119 176601 (2017)
- Emergence and universality in the regulation of stem cell fate Curr. Opin. Syst. Biol. 5 57 - 62 (2017)
- A Unifying Theory of Branching Morphogenesis Cell 171 242 - 255 (2017)
- Nonreciprocal reconfigurable microwave optomechanical circuit. Nat Commun 8 604 (2017)
- Uncovering nonperturbative dynamics of the biased sub-Ohmic spin-boson model with variational matrix product states Phys. Rev. B 96 (2017)
- Fate mapping of human glioblastoma reveals an invariant stem cell hierarchy Nature 549 227 - 232 (2017)
- Hydrogen Clathrate Structures in Rare Earth Hydrides at High Pressures: Possible Route to Room-Temperature Superconductivity Phys. Rev. Lett. 119 107001 (2017)
- Stochastic Kuramoto oscillators with discrete phase states Phys. Rev. E 96 032201 (2017)
- Analytical Spectral Density of the Sachdev-Ye-Kitaev Model at finite N Phys. Rev. D 96 066012 (2017)
- Effective-range dependence of two-dimensional Fermi gases Phys. Rev. A 96 023619 (2017)
- Multipotent Basal Stem Cells, Maintained in Localized Proximal Niches, Support Directed Long-Ranging Epithelial Flows in Human Prostates. Cell Rep. 20 1609 - 1622 (2017)
- Particle-Hole Symmetry in the Fermion-Chern-Simons and Dirac Descriptions of a Half-Filled Landau Level Phys. Rev. X 7 031029 (2017)
- Computationally-guided optimization of small-molecule inhibitors of the Aurora A kinase-TPX2 protein-protein interaction. Chemical Communications (2017)
- Using forces to accelerate first-principles anharmonic vibrational calculations Physical Review Materials 1 023801 (2017)
- Structural properties of genotype-phenotype maps. J. Roy. Soc. Interface 14 20170275 (2017)
- Disorder-Free Localization. Phys. Rev. Lett. 118 266601 (2017)
- Persistent currents in ferromagnetic condensates Phys. Rev. B 95 224512 (2017)