Ferromagnetism in an extended coherently-coupled atomic superfluid

• DOI: 10.48550/arxiv.2209.13235
• Publication Date: 2022-01-01
• Authors: R. Cominotti; Anna Berti; Clement Dulin; Chiara Rogora; Giacomo Lamporesi; Iacopo Carusotto; Alessio Recati; Alessandro Zenesini; G. Ferrari
• Keywords: Hysteresis

Ferromagnetism is an iconic example of a first-order phase transition taking place in spatially extended systems and characterized by hysteresis the formation domain walls. In this paper we demonstrate that atomic superfluid presence coherent coupling between two internal states exhibits quantum from para- to ferromagnetic state. The nature experimentally assessed looking at diagram as function control parameters, phenomena, magnetic susceptibility magnetization fluctuations around critical point. We show observed features are good agreement with mean-field calculations. Additionally, develop experimental protocols deterministically generate walls separate spatial regions opposite Thanks enhanced coherence properties our system compared standard condensed matter systems, results open way towards study different aspects relaxation dynamics isolated many-body systems.