by Louk Rademaker | Mar 8, 2024 | Past meetings
The bandstructure of naturally occurring Bernal bilayer graphene exhibits four linearly dispersed Dirac cones [1] but changes drastically when large electric displacement fields are applied across the two layers. Here, tunable van Hove singularities lead to the...
by Louk Rademaker | Mar 8, 2024 | Past meetings
Complex polarisation textures and emergent functionalities under geometric confinement Ferroelectric materials can host a wide range of unusual structural features, often linked to novel functional properties, potentially useful for nanoelectronics applications. At...
by Louk Rademaker | Feb 28, 2024 | Past meetings
You can download the slides here (PDF). Please register at the doodle before Thursday evening if you want to join for pizza! Location: Stuckelberg, Ecole de PhysiqueTime: Friday 19 April 2024, 12:10 for pizza, 12:30 start discussion
by Louk Rademaker | Feb 20, 2024 | Past meetings
In the context of “flat superconductors”, the Berezinskii-Kosterlitz-Thouless (BKT) theory is naturally involved in the discussion, even if only indirectly. BKT physics is in fact necessary to allow for the (quasi-)long-range-order, otherwise prohibited by...
by Louk Rademaker | Feb 20, 2024 | Past meetings
In sufficiently high magnetic fields, continuous electron bands are transformed into quantized Landau levels (LLs). Although the huge density and degeneracy of states inside the LLs seems at first glance to favor the interactions effects, the famous Kohn theorem [1]...
by Louk Rademaker | Sep 18, 2023 | Past meetings
The Hat tiling, discovered in March this year, is the culmination of decades of mathematical research in aperiodic tilings. Unlike other quasicrystals, such as the Penrose tiling, it requires only a single type of tile to be assembled, the hat tile. In this talk I...
by Louk Rademaker | Sep 18, 2023 | Past meetings
Flat bands in twisted graphene systems offers plethora of strongly correlated states, among these, correlated insulator, superconductor and chern insulator are to name of few. Twisted trilayer graphene has shown robust superconductivity which drastically deviates from...
by Louk Rademaker | Sep 18, 2023 | Past meetings
Dense amorphous materials which exhibits a solid-like behaviour, or ‘structural glasses’, are ubiquitous around us. They span a very wide range of experimental systems in soft matter, condensed matter, or biophysics, such as emulsions, foams, biological tissues,...
by Louk Rademaker | Sep 18, 2023 | Past meetings
I will talk about types and properties of excitons in two-dimensional (2D) van der Waals magnetic insulators and semiconductors, such as CrI3, CrSBr, NiPS3, etc. In these materials excitons couple with the spin-polarized band structure, resulting in various correlated...
by Louk Rademaker | Sep 18, 2023 | Past meetings
The study of strongly interacting electrons in moiré heterostructures of semiconducting transition metal dichalcogenides (sTMDs), such as WSe2 and WS2, has led to the discovery of long sought-after quantum phases and behavior. In addition, strong light-matter...
