Spontaneous Demagnetization of a Dipolar Spinor Bose Gas in an Ultralow Magnetic Field

Pasquiou, Benjamin; Maréchal, É.; Bismut, G.; Pedri, P.; Vernac, L.; Gorceix, O.; Laburthe‐Tolra, B.

doi:10.1103/physrevlett.106.255303

Cited by 116 publications

(166 citation statements)

References 33 publications

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“…In cold gases experiments, the phenomenon that dipolar interactions exhibit spin-orbit coupling is at the heart of demagnetization cooling [28][29][30][31] and has been identified as the driving mechanism for the Einstein-de Haas effect in BoseEinstein condensates [32] and the pattern formation in spinor condensates [33][34][35]. Dipolar relaxation was proposed as a mechanism to reach the quantum Hall regime by the controlled insertion of orbital angular momentum [36].…”

Section: Introductionmentioning

confidence: 99%

Topological bands with a Chern numberC=2by dipolar exchange interactions

et al. 2015

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We demonstrate the realization of topological band structures by exploiting the intrinsic spin-orbit coupling of dipolar interactions in combination with broken time-reversal symmetry. The system is based on polar molecules trapped in a deep optical lattice, where the dynamics of rotational excitations follows a hopping Hamiltonian which is determined by the dipolar exchange interactions. We find topological bands with Chern number C = 2 on the square lattice, while a very rich structure of different topological bands appears on the honeycomb lattice. We show that the system is robust against missing molecules. For certain parameters we obtain flat bands, providing a promising candidate for the realization of hard-core bosonic fractional Chern insulators.

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Section: Introductionmentioning

confidence: 99%

Topological bands with a Chern numberC=2by dipolar exchange interactions

et al. 2015

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“…In recent years, ultracold gases of polar atoms [1][2][3][4][5][6][7] and molecules [8][9][10][11][12] with their long-range anisotropic interactions have attracted a great deal of interest for applications ranging from quantum information science [13][14][15] to condensed matter physics [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer through dipolar coupling: Sympathetic cooling without contact

2016

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We consider two parallel layers of dipolar ultracold Fermi gases at different temperatures and calculate the heat transfer between them. The effective interactions describing screening and correlation effects between the dipoles in a single layer are modeled within the Euler-Lagrange Fermihypernetted chain approximation. The random-phase approximation is used for the interactions across the layers. We investigate the amount of transferred power between the layers as a function of the temperature difference. Energy transfer arises due to the long-range dipole-dipole interactions. A simple thermal model is established to investigate the feasibility of using the contactless sympathetic cooling of the ultracold polar atoms/molecules. Our calculations indicate that dipolar heat transfer is effective for typical polar molecule experiments and may be utilized as a cooling process.

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“…Experiments involving dipolar bosons in optical lattices have recently been performed both with atomic BECs [20] and non-condensed dipolar molecules [21,22]. Up to now, their standard theoretical description has relied on the Extended Bose-Hubbard Model (EBHM) accounting for the interaction between nearest and more distant neighbors [1].…”

Section: Introductionmentioning

confidence: 99%

Dipolar-induced resonance for ultracold bosons in a quasi-one-dimensional optical lattice

et al. 2013

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We study the role of the Dipolar-Induced Resonance (DIR) in a quasi-one-dimensional system of ultracold bosons. We first describe the effect of the DIR on two particles in a harmonic trap. Then, we consider a deep optical lattice loaded with ultracold dipolar bosons. In order to describe this system, we introduce a novel atom-dimer extended Bose-Hubbard model, which is the minimal model correctly accounting for the DIR. We analyze the impact of the DIR on the phase diagram at T = 0 by exact diagonalization of a small-sized system. We show that the DIR strongly affects this phase diagram. In particular, we predict the mass density wave to occur in a narrow domain corresponding to weak nearest-neighbor interactions, and the occurrence of a collapse phase for stronger dipolar interactions.

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Spontaneous Demagnetization of a Dipolar Spinor Bose Gas in an Ultralow Magnetic Field

Cited by 116 publications

References 33 publications

Topological bands with a Chern numberC=2by dipolar exchange interactions

Topological bands with a Chern numberC=2by dipolar exchange interactions

Heat transfer through dipolar coupling: Sympathetic cooling without contact

Dipolar-induced resonance for ultracold bosons in a quasi-one-dimensional optical lattice

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