Quantum Geometry and Flat Band Bose-Einstein Condensation

Aleksi Julku, Georg M. Bruun, Päivi Törmä

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
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Abstract

We study the properties of a weakly interacting Bose-Einstein condensate (BEC) in a flat band lattice system by using the multiband Bogoliubov theory and discover fundamental connections to the underlying quantum geometry. In a flat band, the speed of sound and the quantum depletion of the condensate are dictated by the quantum geometry, and a finite quantum distance between the condensed and other states guarantees stability of the BEC. Our results reveal that a suitable quantum geometry allows one to reach the strong quantum correlation regime even with weak interactions.

Original languageEnglish
Article number170404
Number of pages6
JournalPhysical Review Letters
Volume127
Issue number17
DOIs
Publication statusPublished - 22 Oct 2021
MoE publication typeA1 Journal article-refereed

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