2020/01/23 by C. Madroñero, G. A. Domínguez‐Castro, G. A. Domínguez-Castro +3
Physics and Astronomy · #Amplitude #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Ferromagnetism #Ising model #Lattice (music) #Magnetic field #Magnetization #Miscibility #Nuclear magnetic resonance #Phase (matter) #Physics #Quantum many-body systems #Quantum mechanics #Quantum, superfluid, helium dynamics #Relaxation (psychology) #Slowdown #Spinodal decomposition #Square lattice #Statistical physics #Superfluidity #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.102.033304
published as Phys. Rev. A 102, 033304 (2020) · 6 figures
arxiv created 2020/01/23 · openalex created_date 2020/01/30 · openalex publication_date 2020/09/02 · arxiv updated 2020/09/09 · openalex updated_date 2026/08/05
We investigate the persistence, in time and space, of ferromagnetic domains in two dimensions subjected to the influence of both the static disorder of variable strength and weak interactions. The domains are represented by a two-species bosonic mixture of 87Rb ultracold atoms in different hyperfine states, such that initially one lies on the left half and the other on the right half of a square lattice. The dynamics of the double domain is followed by describing the two-component superfluid through the time-dependent Gross-Pitaevskii coupled equations, with values of the intra- and interspecies interaction that guarantee miscibility of the components. A robust analysis of the magnetization dynamics for several values of the interspecies interaction, reachable in current experimental setups, and the investigation of the density-weighted magnetization correlator lead us to conclude that the presence of structural disorder yields a slowdown the process of destruction of the initial ferromagnetic order. As shown by our numerical calculations, magnetization is maintained up to 50% of its initial value for the largest disorder amplitude considered.