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Theory

 

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Condensed matter physics studies materials made of a huge number of interacting elementary constituents. One speaks about "condensed" matter because typically in these materials, the average distance between elementary constituents is of the order of their own dimension: matter is "dense". For example, in a simple liquid the average distance between atoms is about the size of an atom. The global properties of a system differ in general largely from the individual behaviour of its elementary constituents: one speaks of collective behaviour. A well-known example is that of sound propagating in a crystal. A crystal is made of many atoms distributed on a regular lattice. When the crystal is at low temperature, the atoms are almost still. However, the motion of elementary excitations of the crystal do not resemble that of a free atom. They are acoustic (sound) waves involving a large number of atoms in the crystal. The associated quanta are the famous phonons.

Researchers in the THEO group are interested in diverse condensed matter systems. They seek to provide qualitative (and sometimes quantitative) explanations to phenomena observed in experiments and to predict new ones. Their aim is to understand the collective behaviour of these materials and to propose general concepts that apply to many such systems.

Recent publications:
 


  • van der Meer B, Smallenburg F, Dijkstra M, Filion L. High antisite defect concentrations in hard-sphere colloidal Laves phases. Soft Matter. 2020;16(17):4155-4161.

  • Ferreiro-Córdova C, Royall CP, van Duijneveldt JS. Anisotropic viscoelastic phase separation in polydisperse hard rods leads to nonsticky gelation. Proceedings of the National Academy of Sciences. 2020:201909357.

  • Abramovici G. Incompatible Coulomb hamiltonian extensions. Scientific Reports. 2020;10(1):7280.

  • Jagannathan A, Tarzia M. Re-entrance and localization phenomena in disordered Fibonacci chains. The European Physical Journal B. 2020;93(3):46.

  • Marín-Aguilar S, Wensink HH, Foffi G, Smallenburg F. Tetrahedrality Dictates Dynamics in Hard Sphere Mixtures. Physical Review Letters. 2020;124(20):208005.

  • Stejskal O, Thiaville A, Hamrle J, Fukami S, Ohno H. Current distribution in metallic multilayers from resistance measurements. Physical Review B. 2020;101(23):235437.

  • Kwok S, Botet R, Sharpnack L, Cabane B. Apollonian packing in polydisperse emulsions. Soft Matter. 2020;16(10):2426-2430.

  • Ferreiro-Córdova C, Del Gado E, Foffi G, Bouzid M. Multi-component colloidal gels: interplay between structure and mechanical properties. Soft Matter. 2020;16(18):4414-4421.

  • Bareigts G, Kiatkirakajorn P-C, Li J, et al. Packing Polydisperse Colloids into Crystals: When Charge-Dispersity Matters. Physical Review Letters. 2020;124(5):058003.

  • Kalcheim Y, Camjayi A, del Valle J, Salev P, Rozenberg M, Schuller IK. Non-thermal resistive switching in Mott insulator nanowires. Nature Communications. 2020;11(1):2985.