Welcome to the website of the Quantum Matter Theory Group at the Lorentz Institute, Leiden University. Our research revolves around macroscopic matter that is one or the other way still in the grip of quantum physics.

The group leader Jan Zaanen is suffering from cancer, when you are interested in his story see zaanenstory.

For an extensive overview of all our research directions, click here.
Using the above menu you can find our contact information and much more.

Link to the homepage of the Dutch consortium of experimental and theoretical physicists working on strange metals.

Recent publications:Holographic Duality boek Jan Zaanen

The physics of black holes appears to be as far removed from the physics  of electrons in metals as it can be.

Book Release:

Holographic Duality in Condensed Matter Physics

Read the review on Amazon and  Cambridge University Press



Electronic structure of the parent compound of superconducting infinite-layer nickelatesThe search continues for nickel oxide-based materials with electronic properties similar to cuprate high-temperature superconductors 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. The recent discovery of superconductivity in the doped infinite-layer nickelate NdNiO 2 (refs. 11, 12) has strengthened these efforts. Nature

Superconductivity theory under attack          

Measurements on a superconducting material show an abrupt transition between a normal metal and a ‘strange’ metal. The really strange thing, however, is that this abruptness disappears when the temperature falls. ‘We don’t have any theoretical machinery for this’, says theoretical physicist Jan Zaanen, co-author of a Science article, ‘this is something that only a quantum computer can calculate’.  Science

Group members

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