Exploració per autor "Bruun, Georg M."
Ara es mostren els items 1-7 de 7
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Dropping an impurity into a Chern insulator: A polaron view on topological matter
Camacho-Guardián, Arturo; Goldman, Nathan; Massignan, Pietro Alberto; Bruun, Georg M. (American Physical Society (APS), 2019-02-05)
Article
Accés obertWe investigate the properties of an impurity particle interacting with a Fermi gas in a Cherninsulating state. The interaction leads to the formation of an exotic polaron, which consists of a coherent superposition of the ... -
Mediated interactions between Fermi polarons and the role of impurity quantum statistics
Baroni, Cosetta; Huang, Bo; Fritsche, Isabella; Dobler, Erich; Anich, Gregor; Kirilov, Emil; Grimm, Rudolf; Bastarrachea Magnani, Miguel Angel; Massignan, Pietro Alberto; Bruun, Georg M. (Springer, 2023-10-26)
Article
Accés obertThe notion of quasi-particles is essential for understanding the behaviour of complex many-body systems. A prototypical example of a quasi-particle is a polaron, formed by an impurity strongly interacting with a surrounding ... -
Mobile impurity in a Bose-Einstein condensate and the orthogonality catastrophe
Guenther, Nils Eric; Schmidt, Richard; Bruun, Georg M.; Gurarie, Victor; Massignan, Pietro Alberto (American Physical Society, 2021-01-01)
Article
Accés obertWe analyze the properties of an impurity in a dilute Bose-Einstein condensate (BEC). First the quasiparticle residue of a static impurity in an ideal BEC is shown to vanish with increasing particle number as a stretched ... -
Polarons, dressed molecules and itinerant ferromagnetism in ultracold Fermi gases
Massignan, Pietro Alberto; Zaccanti, Matteo; Bruun, Georg M. (Institute of Physics (IOP), 2014-02-19)
Article
Accés obertIn this review, we discuss the properties of a few impurity atomsimmersed in a gas of ultracold fermions, the so-called Fermi polaron problem. On one side, this many-body system is appealing because it can be described ... -
Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture
Fritsche, Isabella; Baroni, Cosetta; Dobler, Erich; Kirilov, Emil; Huang, Bo; Grimm, Rudolf; Bruun, Georg M.; Massignan, Pietro Alberto (American Physical Society, 2021-05-01)
Article
Accés obertWe investigate the properties of a strongly interacting imbalanced mixture of bosonic 41K impurities immersed in a Fermi sea of ultracold 6 Li atoms. This enables us to explore the Fermi polaron scenario for large impurity ... -
Strong-coupling ansatz for the one-dimensional Fermi gas in a harmonic potential
Levinsen, Jesper; Massignan, Pietro; Bruun, Georg M.; Parish, Meera M. (Science, 2015-07-24)
Article
Accés obertA major challenge in modern physics is to accurately describe strongly interacting quantum many-body systems. One-dimensional systems provide fundamental insights because they are often amenable to exact methods. However, ... -
Topological transport of mobile impurities
Pimenov, Dimitri; Camacho-Guardián, Arturo; Goldman, Nathan; Massignan, Pietro Alberto; Bruun, Georg M.; Goldstein, Moshe (American Physical Society (APS), 2021-06-15)
Article
Accés obertWe study the Hall response of topologically trivial mobile impurities (Fermi polarons) interacting weakly with majority fermions forming a Chern-insulator background. This setting involves a rich interplay between the ...