The effect of boson-boson interaction on the Bipolaron formation

Jäger, Jonas; Barnett, Ryan

doi:10.48550/arxiv.2111.07957

Cited by 3 publications

(3 citation statements)

References 54 publications

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“…A widely studied quasiparticle in the cold-atom realm is the polaron [11,12]; an impurity dressed by the elementary excitations of the bath with distinct bosonic and fermionic quantum statistics [5,[13][14][15]. Fascinating static features of these states include their effective mass [16,17], induced interactions [18,19] and formation of bound states [20][21][22]. Typical nonequilibrium phenomena associated with these structures revealed, among others, their induced correlations [23,24], dynamical decay and relaxation [25][26][27], as well as transport [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron

et al. 2022

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We investigate the formation of magnetic Bose polaron, an impurity atom dressed by spin-wave excitations, in a one-dimensional spinor Bose gas. In terms of 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 (Fr{" o}hlich-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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Section: Introductionmentioning

confidence: 99%

Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron

et al. 2022

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show abstract

Section: Introductionmentioning

confidence: 99%

Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron

Mistakidis,

Koutentakis,

Grusdt

et al. 2022

Preprint

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We investigate the formation of magnetic Bose polaron, an impurity atom dressed by spin-wave excitations, in a one-dimensional spinor Bose gas. In terms of 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 (Fröhlich-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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“…The related problem of two impurities immersed in a Bose gas has also started to attract increasing theoretical attention [31][32][33][34][35][36][37][38][39][40][41][42]. Two impurities can form bound quasiparticles referred to as bipolarons, which are thought to have a closer connection with unconventional pairing and high-T c superconductors [43,44].…”

Section: Introductionmentioning

confidence: 99%

Mobile impurities interacting with a few one-dimensional lattice bosons

Yordanov¹,

Isaule²

2022

Preprint

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We report a comprehensive study of the ground-state properties of one and two bosonic impurities immersed in small one-dimensional optical lattices loaded with a few interacting bosons. We model the system with a two-component Bose-Hubbard model and solve the problem numerically by means of the exact diagonalization method. We report polaron and bipolaron energies across the superfluid to Mott-insulator transition and confirm the formation of bipolaron bound states induced by repulsive interactions. In particular, we found that an insulator bath induces tightly bound bipolarons, whereas a superfluid bath induces shallower bound states.

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The effect of boson-boson interaction on the Bipolaron formation

Cited by 3 publications

References 54 publications

Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron

Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron

Inducing spin-order with an impurity: phase diagram of the magnetic Bose polaron

Mobile impurities interacting with a few one-dimensional lattice bosons

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