Interferometric Order Parameter for Excited-State Quantum Phase Transitions in Bose-Einstein Condensates

verfasst von

Polina Feldmann, Carsten Klempt, Augusto Smerzi, Luis Santos, Manuel Gessner

Abstract

Excited-state quantum phase transitions extend the notion of quantum phase transitions beyond the ground state. They are characterized by closing energy gaps amid the spectrum. Identifying order parameters for excited-state quantum phase transitions poses, however, a major challenge. We introduce a topological order parameter that distinguishes excited-state phases in a large class of mean-field models and can be accessed by interferometry in current experiments with spinor Bose-Einstein condensates. Our work opens a way for the experimental characterization of excited-state quantum phases in atomic many-body systems.

Organisationseinheit(en)

Institut für Theoretische Physik
Institut für Quantenoptik
QuantumFrontiers
SFB 1227: Designte Quantenzustände der Materie (DQ-mat)

Externe Organisation(en)

Università degli Studi di Firenze (UniFi)
College de France
DLR-Forschungseinrichtung Zentrum für Leichtbauproduktionstechnologie (ZLP)

Typ

Artikel

Journal

Physical review letters

Band

126

ISSN

0031-9007

Publikationsdatum

10.06.2021

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Physik und Astronomie (insg.)

Elektronische Version(en)

https://arxiv.org/abs/2011.02823 (Zugang: Offen)
https://doi.org/10.1103/PhysRevLett.126.230602 (Zugang: Geschlossen)