| | | | | | Excitonium discovered in real material
Excitons are pairs of electrons and holes inside a solid material that together behave like a single particle. It has long been suspected that when many such excitons exist in the same piece of matter, they can form a new state of matter, called excitonium. This new phase is essentially a single giant quantum state of excitons, called a Bose-Einstein condensate. If that state does exist, it is expected to hold important clues to the understanding of many other mysterious phases of matter, including even high-termperature superconductivity. However, observing an exciton condensate in any real material has remained a much sought-after goal of condensed matter physicists for decades. In a recent experiment, we now finally prove that this elusive state of matter really does exist. | |  |
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|  | | Finding all possible topological insulators in crystals
Topology has over the past decade or so developed into a central organising principle in the characterisation of phases of matter. While all topological phases of fermions in free space have been fully worked out, taking into account what happens in real-life materials that have additional crystal symmetries remains an active field of research. We recently took a step forwards in this area, by developing a complete classification of all possible crystalline topological insulators, in any dimension, in the presence of only lattice symmetries.
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| Spirals of electron density
Spirals are an intriguing shape to find in the natural world because of their inherent handedness – turning either to the left or right as you move along them. The recent discovery that electrons within a solid material can spontaneously form into a corkscrew shape was an unexpected example of a spiral emerging in physics. The surprisingly straightforward explanation for this phenomenon has recently attracted some attention in the popular science media. | |  |
For the full story, look here. |
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- "Topology and broken Hermiticity"
Corentin Coulais, Romain Fleury, and Jasper van Wezel
Nature Physics, (2020)
doi:10.1038/s41567-020-01093-z
- "Observation of non-Hermitian topology and its bulk-edge correspondence in an active mechanical metamaterial"
Ananya Ghatak, Martin Brandenbourger, Jasper van Wezel, and Corentin Coulais
PNAS, 117, 2020-10580R (2020)
doi:10.1073/pnas.2010580117
- "An introduction to kinks in φ4-theory"
Mariya Lizunova and Jasper van Wezel
arXiv, 2009.00355 (2020)
arXiv:2009.00355
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