Journal
NEW JOURNAL OF PHYSICS
Volume 24, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac836c
Keywords
magnetic Bose gases; quasi-particle physics; spin-waves; magnetic polaron; spin-spin correlations
Categories
Funding
- NSF
- Cluster of Excellence 'Advanced Imaging of Matter' of the Deutsche Forschungsgemeinschaft (DFG) [EXC 2056, 390715994]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC-2111-390814868]
- PIER Hamburg-MIT/BOS Seed Projects [PHM-2019-06]
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In this study, we investigate the formation and phase diagram of magnetic Bose polaron in a one-dimensional spinor Bose gas. The residue of magnetic polarons decreases significantly with strong impurity-spin interactions. Impurities can be utilized to manipulate spin polarization and suppress spin-spin correlations in the magnetic medium.
We investigate the formation of magnetic Bose polaron, an impurity atom dressed by spin-wave excitations, in a one-dimensional spinor Bose gas. Within an effective potential model, the impurity is strongly confined by the host excitations which can even overcome the impurity-medium repulsion leading to a self-localized quasi-particle state. The phase diagram of the attractive and self-bound repulsive magnetic polaron, repulsive non-magnetic (Frohlich-type) polaron and impurity-medium phase-separation regimes is explored with respect to the Rabi-coupling between the spin components, spin-spin interactions and impurity-medium coupling. The residue of such magnetic polarons decreases substantially in both strong attractive and repulsive branches with strong impurity-spin interactions, illustrating significant dressing of the impurity. The impurity can be used to probe and maneuver the spin polarization of the magnetic medium while suppressing ferromagnetic spin-spin correlations. It is shown that mean-field theory fails as the spinor gas approaches immiscibility since the generated spin-wave excitations are prominent. Our findings illustrate that impurities can be utilized to generate controllable spin-spin correlations and magnetic polaron states which can be realized with current cold atom setups.
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