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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:

  • Gariglio S, Caviglia AD, Triscone J-M, Gabay M. A spin–orbit playground: surfaces and interfaces of transition metal oxides. Reports on Progress in Physics. 2019;82(1):012501.

  • Sen AK, Hadamcik E, Botet R, Lasue J, Roy Choudhury S, Gupta R. Photometry and colour index of Comet 67P/Churyumov-Gerasimenko on 2015 December 12. Monthly Notices of the Royal Astronomical Society. 2019;487(4):4809-4818.

  • Monteiro AMRVL, Vivek M, Groenendijk DJ, et al. Band inversion driven by electronic correlations at the (111) LaAlO 3 / SrTiO 3 interface. Physical Review B. 2019;99(20):201102.

  • Wensink H. Effect of Size Polydispersity on the Pitch of Nanorod Cholesterics. Crystals. 2019;9(3):143.

  • Rozenberg M, Schneegans O, Stoliar P. An ultra-compact leaky-integrate-and-fire model for building spiking neural networks. Scientific Reports. 2019;9(1):11123.

  • Borin A, Safi I, Sukhorukov E. Coulomb drag effect induced by the third cumulant of current. Physical Review B. 2019;99(16):165404.

  • Wittmann R, Smallenburg F, Brader JM. Pressure, surface tension, and curvature in active systems: A touch of equilibrium. The Journal of Chemical Physics. 2019;150(17):174908.

  • Rai G, Haas S, Jagannathan A. Proximity effect in a superconductor-quasicrystal hybrid ring. Physical Review B. 2019;100(16):165121.

  • Lu X, Goerbig M-O. Magneto-optical signatures of Volkov-Pankratov states in topological insulators. EPL (Europhysics Letters). 2019;126(6):67004.

  • Zyuzin AA, Simon P. Disorder-induced exceptional points and nodal lines in Dirac superconductors. Physical Review B. 2019;99(16):165145.