Tunable dipolar resonances and Einstein-de Haas effect in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Rb</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>87</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>-atom condensate

Świsłocki, Tomasz; Sowiński, Tomasz; Pietraszewicz, Joanna; Brewczyk, Mirosław; Lewenstein, Maciej; Zakrzewski, Jakub; Gajda, Mariusz

doi:10.1103/physreva.83.063617

Cited by 23 publications

(24 citation statements)

References 24 publications

(38 reference statements)

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“…In the system composed of 52 Cr atoms [25][26][27][28] Feshbach resonances can enhance the effect of dipole-dipole forces. It was suggested in [29][30][31][32][33], and confirmed in [34], that dipolar effects may be observed also in the spinor F = 1 87 Rb BEC. The existence of long-range interactions is a motivating factor for studing systematically the effect of dipolar interactions on the level of squeezing in the simplest F = 1 spinor BECs.…”

Section: Introductionmentioning

confidence: 98%

Spin squeezing in dipolar spinor condensates

Kajtoch

Witkowska

2016

Phys. Rev. A

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We study the effect of dipolar interactions on the level of squeezing in spin-1 Bose-Einstein condensates by using the single mode approximation. We limit our consideration to the su(2) Lie subalgebra spanned by spin operators. The biaxial nature of dipolar interactions allows for dynamical generation of spin-squeezed states in the system. We analyze the phase portraits in the reduced mean-filed space in order to determine positions of unstable fixed points. We calculate numerically spin squeezing parameter showing that it is possible to reach the strongest squeezing set by the two-axis countertwisting model. We partially explain scaling with the system size by using the Gaussian approach and the frozen spin approximation.

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Section: Introductionmentioning

confidence: 98%

Spin squeezing in dipolar spinor condensates

Kajtoch

Witkowska

2016

Phys. Rev. A

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“…Magnetic interactions can lead to a transfer of angular momentum from spin to orbital degrees of freedom. This phenomenon, discovered in ferromagnetic solid samples, is known as the Einstein-de Haas effect [9][10][11][12]. Not a long range character of magnetic dipolar interactions but rather their relation to the angular momentum plays a crucial role in this phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…This energy is typically much larger than the energy of dipolar interactions and conservation of energy strongly suppresses the spin dynamics. The transfer of atoms between two spinor components can be enhanced by tuning energies of states involved via Zeeman effect [11]. We extend this idea to lattice gases.…”

Section: Introductionmentioning

confidence: 99%

Two-component Bose-Hubbard model with higher-angular-momentum states

Pietraszewicz¹,

Sowiński²,

Brewczyk³

et al. 2012

Phys. Rev. A

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Bose-Hubbard Hamiltonian of cold two-component Bose gas of spinor chromium atoms is studied. Dipolar interactions of magnetic moments while tuned resonantly by an ultralow magnetic field can lead to a transfer of atoms from the ground to excited Wannier states with a nonvanishing angular orbital momentum. Hence we propose the way of creating P x + iP y orbital superfluid. The spin introduces an additional degree of control and leads to a variety of different stable phases of the system. The Mott insulator of atoms in a superposition of the ground and vortex Wannier states as well as a superposition of the Mott insulator with orbital superfluid are predicted.

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“…In axially symmetric traps the phase of the m S = 2 atoms' wavefunction displays a characteristics vortex-like defect signifying an orbital angular momentum in a final state. This scenario has been studied in the mean field limit, for a three component Rubidium spinor condensate [8]. It has been shown that different final states, all involving vortex-like excitation, can be populated via the dipolar processes of the EdH type.…”

Section: Introductionmentioning

confidence: 99%

Spin dynamics of two bosons in an optical lattice site: A role of anharmonicity and anisotropy of the trapping potential

et al. 2013

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We study spin dynamics of two magnetic Chromium atoms trapped in a single site of a deep optical lattice in a resonant magnetic field. Dipole-dipole interactions couple spin degrees of freedom of two particles to their quantized orbital motion. A trap geometry combined with two-body contact s-wave interactions influence a spin dynamics through the energy spectrum of the two atom system. Anharmonicity and anisotropy of the site results in a 'fine' structure of two body eigenenergies. The structure can be easily resolved by weak magnetic dipole-dipole interactions. As an example we examine the effect of anharmonicity and anisotropy of the binding potential on demagnetization processes. We show that weak dipolar interactions provide a perfect tool for a precision spectroscopy of the energy spectrum of the interacting few particle system.

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Tunable dipolar resonances and Einstein-de Haas effect in aRb87-atom condensate

Cited by 23 publications

References 24 publications

Spin squeezing in dipolar spinor condensates

Spin squeezing in dipolar spinor condensates

Two-component Bose-Hubbard model with higher-angular-momentum states

Spin dynamics of two bosons in an optical lattice site: A role of anharmonicity and anisotropy of the trapping potential

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