Probing Ferromagnetic Order in Few-Fermion Correlated Spin-Flip Dynamics

Abstract

We unravel the dynamical stability of a fully polarized one-dimensional ultracold few-fermion spin-1/2 gas subjected to inhomogeneous driving of the itinerant spins. Despite the unstable character of the total spin-polarization the existence of an interaction regime is demonstrated where the spin-correlations lead to almost maximally aligned spins throughout the dynamics. The resulting ferromagnetic order emerges from the build up of superpositions of states of maximal total spin. They comprise a decaying spin-polarization and a dynamical evolution towards an almost completely unpolarized NOON-like state. Via single-shot simulations we demonstrate that our theoretical predictions can be detected in state-of-the-art ultracold experiments.

18 pages, 7 figures

References in corpus (17)

• Quantum magnetism and criticality
• Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms
• Magnetic field sensing beyond the standard quantum limit using 10-spin NOON states
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• Non-equilibrium spin dynamics in a trapped Fermi gas with effective spin-orbit interaction
• Engineering the Dynamics of Effective Spin-Chain Models for Strongly Interacting Atomic Gases
• Correlation Effects in the Quench-Induced Phase Separation Dynamics of a Two-Species Ultracold Quantum Gas
• Strongly Interacting Quantum Gases in One-Dimensional Traps
• Time-resolved observation of competing attractive and repulsive short-range correlations in strongly interacting Fermi gases
• Repulsive Fermi Polarons and Their Induced Interactions in Binary Mixtures of Ultracold Atoms
• Unstable Avoided Crossing in Coupled Spinor Condensates
• Many-Body Quantum Dynamics in the Decay of Bent Dark Solitons of Bose-Einstein Condensates
• Phase Separation Dynamics Induced by an Interaction Quench of a Correlated Fermi-Fermi Mixture in a Double Well
• Correlated Tunneling Dynamics of an Ultracold Fermi-Fermi Mixture Confined in a Double-Well
• Repulsive Fermi polarons with negative effective mass
• Polarization in a three-dimensional Fermi gas with Rabi coupling
• Ground-State Magnetization in Mixtures of a Few Ultra-Cold Fermions in One-Dimensional Traps

Cited by in corpus (26)

• One-dimensional mixtures of several ultracold atoms: a review
• Few-body Bose gases in low dimensions -- a laboratory for quantum dynamics
• Effective approach to impurity dynamics in one-dimensional trapped Bose gases
• MCTDH-X: The multiconfigurational time-dependent Hartree method for indistinguishable particles software
• Many-body quantum dynamics and induced correlations of Bose polarons
• Induced correlations between impurities in a one-dimensional quenched Bose gas
• Dissipative correlated dynamics of a moving impurity immersed in a Bose-Einstein Condensate
• Correlated quantum dynamics of two quenched fermionic impurities immersed in a Bose-Einstein Condensate
• Pump Probe Spectroscopy of Bose Polarons: Dynamical Formation and Coherence
• Correlated dynamics of fermionic impurities induced by the counterflow of an ensemble of fermions
• Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron
• Universal scaling of spin mixing dynamics in a strongly interacting one-dimensional Fermi gas
• Pulse and continuously driven many-body quantum dynamics of bosonic impurities in a Bose-Einstein condensate
• Many-body effects on second-order phase transitions in spinor Bose-Einstein condensates and breathing dynamics
• Interplay of phase separation and itinerant magnetism for correlated few fermions in a double-well
• Superfluidity fraction of few bosons in an annular geometry in the presence of a rotating weak link
• Many-body molecule formation at a domain wall in a one-dimensional strongly interacting ultracold Fermi gas
• Comparison of renormalized interactions using one-dimensional few-body systems as a testbed
• Spin-orbit coupling in the presence of strong atomic correlations
• Repulsive dynamics of strongly attractive one-dimensional quantum gases
• Non-Hermitian Ferromagnetism in an Ultracold Fermi Gas
• Sub-Poissonian atom-number distributions by means of Rydberg dressing and electromagnetically induced transparency
• Bose-like few-fermion systems
• Spin-charge correlations in finite one-dimensional multi-band Fermi systems
• Flux-driven quantum spin liquids in kagome optical lattices
• Phase Transitions of Repulsive Two-Component Fermi Gases in Two Dimensions