Magnetoroton Softening in Rb Spinor Condensates with Dipolar Interactions

Cherng, R. W.; Demler, Eugene

doi:10.1103/physrevlett.103.185301

Cited by 32 publications

(59 citation statements)

References 27 publications

(27 reference statements)

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“…However, recent experiments on spatially extended spinor gases revealed variegated magnetization textures produced upon cooling unmagnetized spinor gases into the quantum degenerate regime [8]. Theoretical works examined whether such textures could be favored at equilibrium by the substantial magnetic dipolar interactions in the 87 Rb gas; however, while some inhomogeneous textures do appear to be energetically favored, or at least metastable, they are predicted to evince spin-density modulations only on much longer lengths scales than observed experimentally [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Long-time-scale dynamics of spin textures in a degenerateF=187Rb spinor Bose gas

et al. 2011

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We investigate the long-term dynamics of spin textures prepared by cooling unmagnetized spinor gases of F = 1 87 Rb to quantum degeneracy, observing domain coarsening and a strong dependence of the equilibration dynamics on the quadratic Zeeman shift q. For small values of |q|, the textures arrive at a configuration independent of the initial spin-state composition, characterized by large length-scale spin domains and the establishment of easy-axis (negative q) or easy-plane (positive q) magnetic anisotropy. For larger |q|, equilibration is delayed as the spin-state composition of the degenerate spinor gas remains close to its initial value. These observations support the mean-field equilibrium phase diagram predicted for a ferromagnetic spinor Bose-Einstein condensate and also illustrate that equilibration is achieved under a narrow range of experimental settings, making the F = 1 87 Rb gas more suitable for studies of nonequilibrium quantum dynamics.

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Section: Introductionmentioning

confidence: 99%

Long-time-scale dynamics of spin textures in a degenerateF=187Rb spinor Bose gas

et al. 2011

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“…The same argument cannot be, however, employed with the magnetic-field gradient which may play a significant role in the spinor dynamics [27], as discussed in Sec. VII.…”

Section: Hamiltonianmentioning

confidence: 99%

“…II the homogeneous LZE plays typically no role in the spinor dynamics (only at very low magnetic fields B < 1 mG the DDI could induce the equivalent of the Einstein-de Haas effect [25,26], and in this case the residual LZE could play a role). However, magnetic-field gradients cannot be gauged out, and may play a relevant role in the spinor physics [27]. In this section, we analyze the effects that these gradients may have on the amplification dynamics.…”

Section: Effects Of Magnetic-field Gradients On the Amplificatiomentioning

confidence: 99%

“…Although this does not affect the local short-range interactions, it does modify the nonlocal DDI. For large-enough gradients this may lead to a time-averaged DDI [27]. For weak gradients, as those considered in the following, the explicit time dependence induced by the gradients must be considered.…”

Section: Effects Of Magnetic-field Gradients On the Amplificatiomentioning

confidence: 99%

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Parametric amplification of matter waves in dipolar spinor Bose-Einstein condensates

Deuretzbacher¹,

Gebreyesus²,

Topic³

et al. 2010

Phys. Rev. A

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Spin-changing collisions may lead under proper conditions to the parametric amplification of matter waves in spinor Bose-Einstein condensates. Magnetic dipole-dipole interactions, although typically very weak in alkalimetal atoms, are shown to play a very relevant role in the amplification process. We show that these interactions may lead to a strong dependence of the amplification dynamics on the angle between the trap axis and the magnetic-field orientation. We analyze as well the important role played by magnetic-field gradients, which also modify strongly the amplification process. Magnetic-field gradients, hence, must be carefully controlled in future experiments, in order to observe clearly the effects of the dipolar interactions in the amplification dynamics.

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“…The existence of roton-like excitations generally implies that the system has a tendency towards developing crystalline order, and the softening of the roton mode is often a route towards realizing correlated states of matter such as supersolids and Wigner crystals in Bose and Fermi systems [30][31][32][33][34][35][36]. Observing this mode therefore constitutes an essential first step towards the study of many body physics in dipolar systems.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of correlations in a quasi-two-dimensional dipolar Bose gas following a quantum quench

Natu

Campanello²,

Sarma³

2014

Phys. Rev. A

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We study the evolution of correlations in a quasi-2D dipolar gas driven out-of-equilibrium by a sudden ramp of the interactions. On short timescales, roton-like excitations coherently oscillate in and out of the condensate, giving rise to pronounced features in the time-evolution of the momentum distribution, excited fraction and the density-density correlation function. The evolution of these correlation functions following a quench can thus be used to probe the spectrum of the dipolar gas. We also find that density fluctuations induced by the presence of rotons following the quench, dramatically slows down the rate of spreading of correlations in the system: near the roton instability, correlations take infinitely long to build up and show deviations from light-cone like behavior.

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Magnetoroton Softening in Rb Spinor Condensates with Dipolar Interactions

Cited by 32 publications

References 27 publications

Long-time-scale dynamics of spin textures in a degenerateF=187Rb spinor Bose gas

Long-time-scale dynamics of spin textures in a degenerateF=187Rb spinor Bose gas

Parametric amplification of matter waves in dipolar spinor Bose-Einstein condensates

Dynamics of correlations in a quasi-two-dimensional dipolar Bose gas following a quantum quench

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