Many-body exceptional points in colliding condensates

Mati Aharonyan, Emanuele G. Dalla Torre

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4 Scopus citations


Exceptional points describe the coalescence of the eigenmodes of a non-Hermitian matrix. When an exceptional point occurs in the unitary evolution of a many-body system, it generically leads to a dynamical instability with a finite wavevector [N. Bernier et al., Phys. Rev. Lett. 113, 065303 (2014)]. Here, we study exceptional points in the context of the counterflow instability of colliding Bose–Einstein condensates. We show that the instability of this system is due to an exceptional point in the Bogoliubov spectrum. We further clarify the connection of this effect to the Landau criterion of superfluidity and to the scattering of classical particles. We propose an experimental set-up to directly probe this exceptional point, and demonstrate its feasibility with the aid of numerical calculations. Our work fosters the observation of exceptional points in nonequilibrium many-body quantum systems.

Original languageEnglish
Pages (from-to)1971-1980
Number of pages10
JournalMolecular Physics
Issue number15-16
StatePublished - 18 Aug 2019

Bibliographical note

Publisher Copyright:
© 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.


This research is supported by the Israel Science Foundation [grant number 1452/14].

FundersFunder number
Israel Science Foundation1452/14


    • Many-body quantum
    • counterflow instability
    • dynamics
    • exceptional points
    • superfluidity


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