Emil J. Bergholtz

Emil Johansson Bergholtz


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Works at Department of Physics
Telephone 08-553 780 35
Visiting address Roslagstullsbacken 21
Room C5:3009
Postal address Fysikum 106 91 Stockholm

About me

With the help of the Wallenberg Academy Fellows program, I recently returend to my alma mater Stockholm University after 8 years abroad -- as a Disthinguished PKS fellow at the Max Planck Institute for the Physics of Complex Systems in Dresden and as an Emmy Noether Group Leader at the Free University of Berlin.

Presently I supervise 5 PhD students, Jörg Behrmann (in Berlin), Maximilian Trescher (in Berlin), Flore Kunst, Marcus Stålhammar and Elisabet Edvardsson as well as 3 Posdocs, Zhao Liu (in Berlin), Yaron Kedem and Johan Carlström.


I teach courses on several topics, presently on Advanced Quantum Mechanics. 


I'm a theoretical physicsist who is faschinated by the world of quantum mechanics, in particular the by collective behaviour of many particles under extreme conditions, their exuberant phenomenology and possible impact on future technology.

Most saliently, we study quantum many-particle systems for which topology, entanglement and interactions play important roles. These include fractional quantum Hall states, geometrically frustrated magnets, Weyl semimetals and various instances of flat band models. A common feature in these systems is that their low-energy quasiparticles bear little or no resemblance to their electronic constituents. Instead, the quasiparticles have intriguing properties such as fractional charge and statistics. To understand these notoriously complex systems we use a combinationof analytical and numerical methods, beyond standard many-body theory, including exact diagnalization, field theory, strong coupling expansions etc., we occasionally adopt new methods and concepts from quantum information theory, including entanglement quantifiers and tensor networks, and contemporary mathematics, such as compressed sensing.

Our research brings together several frontiers of basic science, while at the same time having the potential to provide the basis of future technological advances such as robust “topological quantum computers”.

Last updated: March 23, 2018

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