Tuning the Dipole-Dipole Interaction in a Quantum Gas with a Rotating Magnetic Field

Tang, Yongqiang; Kao, Wil; Li, Kuan-Yu; Lev, Benjamin

doi:10.1103/physrevlett.120.230401

Cited by 71 publications

(68 citation statements)

References 51 publications

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“…The impurities interact through a long range interaction, in particular a dipole-dipole coupling-that under suitable conditions we were able to treat as a spring-like interaction. In this work we considered the particular case of a fixed angle, motivated by the results in [39], but the results should also hold under an angle-averaged scenario, by taking advantage of the results in( [41]). We showed the dynamics of these impurities can be described within the framework of quantum Brownian motion, where the excitation modes of the gas play the role of the bath.…”

Section: Discussionmentioning

confidence: 99%

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Heat current control in trapped Bose–Einstein Condensates

et al. 2019

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We investigate the heat transport and the control of heat current among two spatially separated trapped Bose-Einstein Condensates (BECs), each of them at a different temperature. To allow for heat transport among the two independent BECs we consider a link made of two harmonically trapped impurities, each of them interacting with one of the BECs. Since the impurities are spatially separated, we consider long-range interactions between them, namely a dipole-dipole coupling. We study this system under theoretically suitable and experimentally feasible assumptions/parameters. The dynamics of these impurities is treated within the framework of the quantum Brownian motion model, where the excitation modes of the BECs play the role of the heat bath. We address the dependence of heat current and current-current correlations on the physical parameters of the system. Interestingly, we show that heat rectification, i.e. the unidirectional flow of heat, can occur in our system, when a periodic driving on the trapping frequencies of the impurities is considered. Therefore, our system is a possible setup for the implementation of a phononic circuit. Motivated by recent developments on the usage of BECs as platforms for quantum information processing, our work offers an alternative possibility to use this versatile setting for information transfer and processing, within the context of phononics, and more generally in quantum thermodynamics. R J J J J max , , 6 9 j D j D j D j D ,r ,rwhere ( ) J j D ,r is the value of the current, once the temperature gradient is reversed, i.e. when the two baths' temperatures are interchanged. Notice that this coefficient takes values between 0 and 2, namely, R=0 when = -,r , with the current being symmetric under reversing the temperature gradient. The upper bound is achieved when the current remains unaffected by reversing the temperature gradient. When either of the two currents is blocked, the coefficient is equal to one.

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Section: Discussionmentioning

confidence: 99%

“…The angle θ can be experimentally controlled as was recently shown in [39]. This is possible thanks to a rotating magnetic field B rot in the x-y plane that causes the dipoles to rotate at an angle θ with respect to a static magnetic field B z along the z axis.…”

Section: The Modelmentioning

confidence: 96%

Heat current control in trapped Bose–Einstein Condensates

et al. 2019

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“…In 2002, Giovanazzi et al [10] proposed a scheme for tuning the DDIs by rotating the dipoles fast enough that the interaction can be time-averaged. This scheme was recently implemented in an experiment with a Bose-Einstein condensate (BEC) of 162 Dy atoms by Tang et al [11]. In these experiments, the anisotropic expansion dynamics of the condensate (which depends on the magnitude and sign of the DDI) was used to reveal the effects of the tuned interactions.…”

Section: Introductionmentioning

confidence: 99%

Rotational tuning of the dipole-dipole interaction in a Bose gas of magnetic atoms

Baillie

Blakie

2020

Phys. Rev. A

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We investigate the dynamics of a Bose-Einstein condensate of magnetic atoms in which the dipoles are rotated by an external magnetic field. The time-averaged dipole-dipole interaction between the atoms is effectively tuned by this rotation, however recent experimental and theoretical developments show that dynamic instabilities emerge that may cause heating. We present simulations of a realistic tuning sequence in this system, and characterize the system behavior and the emergence of instabilities. Our results indicate that the instabilities develop more slowly as the rotation frequency increases, and indicate that experiments with tuned dipole-dipole interactions should be feasible.

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“…These features are responsible for a whole series of new phenomena that appear in ultracold dipolar gases [6]. If we take into account that the strength of the contact interactions can be varied over many orders of magnitude using the Feshbach resonance [7] technique, and that the DDI strength can be also tuned using a fast rotating magnetic or electric field [8,9], it is easy to see that such a versatility of dipolar quantum gases is unparalleled and makes them an obligatory element in a toolbox for engineering quantum devices and sensors.…”

Section: Introductionmentioning

confidence: 99%

Faraday and Resonant Waves in Dipolar Cigar-Shaped Bose-Einstein Condensates

Vudragović

Balaž

2019

Symmetry

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Faraday and resonant density waves emerge in Bose-Einstein condensates as a result of harmonic driving of the system. They represent nonlinear excitations and are generated due to the interaction-induced coupling of collective oscillation modes and the existence of parametric resonances. Using a mean-field variational and a full numerical approach, we studied density waves in dipolar condensates at zero temperature, where breaking of the symmetry due to anisotropy of the dipole-dipole interaction (DDI) plays an important role. We derived variational equations of motion for the dynamics of a driven dipolar system and identify the most unstable modes that correspond to the Faraday and resonant waves. Based on this, we derived the analytical expressions for spatial periods of both types of density waves as functions of the contact and the DDI strength. We compared the obtained variational results with the results of extensive numerical simulations that solve the dipolar Gross-Pitaevskii equation in 3D, and found a very good agreement.

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Tuning the Dipole-Dipole Interaction in a Quantum Gas with a Rotating Magnetic Field

Cited by 71 publications

References 51 publications

Heat current control in trapped Bose–Einstein Condensates

Heat current control in trapped Bose–Einstein Condensates

Rotational tuning of the dipole-dipole interaction in a Bose gas of magnetic atoms

Faraday and Resonant Waves in Dipolar Cigar-Shaped Bose-Einstein Condensates

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