Supersolid Phases of Cold Atom Assemblies

Boninsegni, M.

doi:10.1007/s10909-012-0571-1

Cited by 51 publications

(54 citation statements)

References 44 publications

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“…A number of theoretical suggestions have been made of specific cold atom systems and settings, wherein this elusive phase of matter may be unambiguously observed, for example with Rydberg atoms [27][28][29][30][31][32][33]; experimentally, evidence of novel phases displaying density ordering and superfluidity has been recently reported for atomic BECs featuring spin-orbit interactions [34], or coupled to the modes of optical cavities [35].…”

Section: Introductionmentioning

confidence: 99%

Classical and quantum filaments in the ground state of trapped dipolar Bose gases

Cinti

2017

Phys. Rev. A

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We study by quantum Monte Carlo simulations the ground state of a harmonically confined dipolar Bose gas with aligned dipole moments, and with the inclusion of a repulsive two-body potential of varying range. Two different limits can be clearly identified, namely a classical one in which the attractive part of the dipolar interaction dominates and the system forms an ordered array of parallel filaments, and a quantum-mechanical one, wherein filaments are destabilized by zero-point motion, and eventually the ground state becomes a uniform cloud. The physical character of the system smoothly evolves from classical to quantum mechanical as the range of the repulsive twobody potential increases. An intermediate regime is observed, in which ordered filaments are still present, albeit forming different structures from the ones predicted classically; quantum-mechanical exchanges of indistinguishable particles across different filaments allow phase coherence to be established, underlying a global superfluid response.

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Section: Introductionmentioning

confidence: 99%

Classical and quantum filaments in the ground state of trapped dipolar Bose gases

Cinti

2017

Phys. Rev. A

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“…43 The dipole-blockaded condensate is an extremely attractive system in which one might hope to observe a supersolid, yet it does possess a number of challenges, most notably in achieving the desired parameter regime in a Rydberg dressed state. [44][45][46] Looking away from the dipole-blockaded condensate, ground-state polar molecules possess a tunable electric dipoledipole interaction, and so, given the correct parameter regime, are likely to possess a supersolid state. Alternatively, one could consider a Bose-Einstein condensate with an optical lattice imposed through the application of (time-dependent) external potentials which would lead to a supersolid state.…”

Section: Discussionmentioning

confidence: 99%

Phase-jump nucleation in a one-dimensional model of a supersolid

Mason

Josserand

2013

Phys. Rev. B

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We consider the activation of phase jumps in a one-dimensional Bose-Einstein condensate. Our system includes a nonlocal interaction term which mimics, for example, a dipole-blockaded Rydberg system. In the mean-field limit the condensate can form superfluid droplets, arranged periodically on a line, thus displaying a supersolidlike ground state. Under an imposed velocity, phase jumps will develop. We study these phase jumps numerically and analytically, and are able to write down a relationship between the velocity, the width of the density peaks, the number of phase jumps, and , a parameter that determines the number of peaks in the condensate.

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“…Recent experiments have demonstrated coherent Rydberg excitation in a Bose-Einstein condensate [15], and observed long-time effects of molecular interactions [16][17][18][19][20] between Rydberg and ground state atoms. Theory predicts that this approach also yields a unique type of longrange interactions between Rydberg-dressed ground state atoms, that would enable the observation of interesting nonlinear wave dynamics [21][22][23][24] and exotic many-body phenomena, such as supersolidity [13,14,[25][26][27][28][29][30][31][32], in degenerate quantum gases.Extending this scheme to atomic lattices promises a number of intriguing perspectives, e.g., for quantum transport problems [33], applications in quantum computation [34], quantum simulations of lattice models [35], and spin squeezing in optical lattice clocks [36]. However, in a recent work [37] it was predicted that atomic motion together with the strong repulsion between the excited atoms induces large trap losses that would inevitably preclude the applicability of Rydberg dressing in optical lattices.…”

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confidence: 99%

Rydberg dressing of atoms in optical lattices

Macrì

Pohl

2014

Phys. Rev. A

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We study atoms in optical lattices whose electronic ground state is off-resonantly coupled to a highly excited state with strong binary interactions. We present a time-dependent treatment of the resulting quantum dynamics, which -contrary to recent predictions [Phys. Rev. Lett. 110, 213005 (2013)] -proves that the strong repulsion between the weakly admixed Rydberg states does not lead to atomic trap-loss. This finding provides an important basis for creating and manipulating coherent long-range interactions in optical lattice experiments.PACS numbers: 32.80. Ee, 32.80.Rm, 37.10.De By virtue of their strong interactions, laser-excitation of high-lying Rydberg states in cold atomic gases has recently enabled numerous experimental breakthroughs in quantum information science [1][2][3], quantum nonlinear optics [4][5][6][7][8][9] and investigations of long-range interacting quantum many-body systems [10][11][12]. Most of these applications rely on the ability to manipulate atoms coherently on timescales below the radiative lifetime of the excited states, during which atoms remain essentially frozen in space. However, it was shown [13,14] that off-resonant excitation of Rydberg states can extend this timescale limitation beyond this frozen gas regime. Recent experiments have demonstrated coherent Rydberg excitation in a Bose-Einstein condensate [15], and observed long-time effects of molecular interactions [16][17][18][19][20] between Rydberg and ground state atoms. Theory predicts that this approach also yields a unique type of longrange interactions between Rydberg-dressed ground state atoms, that would enable the observation of interesting nonlinear wave dynamics [21][22][23][24] and exotic many-body phenomena, such as supersolidity [13,14,[25][26][27][28][29][30][31][32], in degenerate quantum gases.Extending this scheme to atomic lattices promises a number of intriguing perspectives, e.g., for quantum transport problems [33], applications in quantum computation [34], quantum simulations of lattice models [35], and spin squeezing in optical lattice clocks [36]. However, in a recent work [37] it was predicted that atomic motion together with the strong repulsion between the excited atoms induces large trap losses that would inevitably preclude the applicability of Rydberg dressing in optical lattices. Here, we present a time-dependent treatment of this problem and show that such trap losses (i ) are negligibly small under the approximations used in [37] and (ii ) are strictly absent if a more accurate description of the Rydberg-Rydberg atom interactions is employed.Rydberg dressing in free space -Let us first consider an ensemble of atoms in free space [13,14], whose ground state |g is off-resonantly coupled to a high-lying Rydberg state |e with a Rabi frequency Ω and a laser detuning ∆ Ω. The excited atoms feature greatly enhanced van der Waals (vdW) interactions V ee = C 6 /x 6 . Owing to the strong scaling of the vdW coefficient C 6 ∼ n 11 with the atom's principal quantum number n, V ee exceeds the groun...

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Supersolid Phases of Cold Atom Assemblies

Cited by 51 publications

References 44 publications

Classical and quantum filaments in the ground state of trapped dipolar Bose gases

Classical and quantum filaments in the ground state of trapped dipolar Bose gases

Phase-jump nucleation in a one-dimensional model of a supersolid

Rydberg dressing of atoms in optical lattices

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