Cold polar molecules in two-dimensional traps: Tailoring interactions with external fields for novel quantum phases

Micheli, A.; Pupillo, Guido; Büchler, Hans Peter; Zoller, P.

doi:10.1103/physreva.76.043604

Cited by 215 publications

(296 citation statements)

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Section: Controlling Chemical Reactions For Many Applications Based mentioning

confidence: 99%

“…[66] were not performed in a fully two-dimensional trap, and thus the inelastic loss rate was only suppressed by about a factor of 60. For very strong optical confinements and sufficiently large electric fields, repulsive dipolar 7 interactions can suppress inelastic collisions, regardless of the quantum statistics [68,69].In a 3D lattice, if s-wave inelastic collisions are allowed, the onsite loss rate Γ for two molecules is very large. Γ can be significantly larger than the tunneling rate J and be of the same order of magnitude as the energy gap between the two lowest lattice bands.…”

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New frontiers for quantum gases of polar molecules

et al. 2016

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The field of ultracold quantum matter has burgeoned over the last few decades, thanks to the growing capabilities for atomic systems to be probed and manipulated with exquisite control. Researchers can now precisely create and study quantum manybody states that are effectively isolated from the external environment. Much of the work in ultracold matter has focused on systems of alkali or alkaline-earth atoms, mainly due to their ease of cooling. Extending this precise control to molecules has seen rapidly increasing interest and activity, as molecules possess additional degrees of freedom that make them useful for tests of fundamental physics, studying ultracold chemistry and collisions, and engineering qualitatively new types of quantum phases and quantum many-body systems. Here, we review one particularly fruitful research direction: the creation and manipulation of ultracold bialkali molecules. The recent success in creating a quantum gas of polar molecules opens many exciting research opportunities. Atomic, Molecular, and Optical (AMO) systems offer experimentalists the ability to precisely control interactions in a quantum many-body system [1,2], and a rich set of experiments has already been performed. Some prominent examples include studies of the BEC-BCS crossover in two-component Fermi gases [3,4,5] and the superfluid-Mott insulator transition in ultracold bosons loaded into a 3D optical lattice [6]. Neutral atomic systems normally have point-like contact interactions that can be parametrized with a single quantity, the scattering length a, which can be tuned via a Feshbach resonance [2]. In recent years, systems with long-range and anisotropic interactions have garnered much attention. One natural example is the dipolar interaction between polar molecules, which is the focus of this Review. Of course, many other experimental platforms are also being pursued that feature long-range interactions, including highly magnetic atoms [7,8], trapped ions The dipolar interaction exhibits several important attributes. First, the energy scales in dipolar systems are usually much larger than those in typical atomic alkali systems, making it easier to study interaction-driven structural properties and non-equilibrium dynamics. Second, and perhaps more importantly, the anisotropic and long-range nature of the interaction allows for the realization of novel quantum phases, especially when the spatial dimensions of the system can be varied with optical lattices. Some of these engineered systems may find relevance to outstanding problems in condensed-matter physics [13,14]; moreover, qualitatively new types of physics can emerge in the presence of long-range interactions [15,16,17,18,19,20,21]. As a specific example of a unique feature of long-range interactions, a spin-1/2 Hamiltonian can be encoded based on a pair of oppositeparity rotational states where dipolar interactions give rise to a direct spin exchange coupling between molecules [22,23]. With this scheme implemented in an optical lattice, many-body spin dynam...

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Section: Controlling Chemical Reactions For Many Applications Based mentioning

confidence: 99%

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confidence: 99%

New frontiers for quantum gases of polar molecules

et al. 2016

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“…(16)- (18) can be created using tensor shifts [18,21,24,30,43,64] and superlattices [9] so that up-and down-spins (both the initial |↑ and |↓ and the effective |⇑ and |⇓ ) have different potential energies.…”

Section: Preparation and Detectionmentioning

confidence: 99%

“…The amplitudes and signs of J ⊥ , J z , V , and W can be tuned independently [30] by tuning the external dc electric field and applying external microwave fields [17][18][19][21][22][23][24][25]29,[42][43][44][45][46]. The tunneling amplitude t (assumed to be positive throughout the paper) can be tuned by adjusting the depth of the optical lattice.…”

Section: The T-j-v -W Hamiltonianmentioning

confidence: 99%

d-wave superfluidity in optical lattices of ultracold polar molecules

2011

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Recent work on ultracold polar molecules, governed by a generalization of the t-J Hamiltonian, suggests that molecules may be better suited than atoms for studying d-wave superfluidity due to stronger interactions and larger tunability of the system. We compute the phase diagram for polar molecules in a checkerboard lattice consisting of weakly coupled square plaquettes. In the simplest experimentally realizable case where there is only tunneling and an XX-type spin-spin interaction, we identify the parameter regime where d-wave superfluidity occurs. We also find that the inclusion of a density-density interaction destroys the superfluid phase and that the inclusion of a spin-density or an Ising-type spin-spin interaction can enhance the superfluid phase. We also propose schemes for experimentally realizing the perturbative calculations exhibiting enhanced d-wave superfluidity.

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“…Powerful microwave dressing techniques borrowed from the polar-molecule literature [54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] can be used to access a great variety of Hamiltonians beyond the one given in Eq. (6) …”

Section: Applications To Exotic Quantum Magnetismmentioning

confidence: 99%

Controllable quantum spin glasses with magnetic impurities embedded in quantum solids

et al. 2013

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Magnetic impurities embedded in inert solids can exhibit long coherence times and interact with one another via their intrinsic anisotropic dipolar interaction. We argue that, as a consequence of these properties, disordered ensembles of magnetic impurities provide an effective platform for realizing a controllable, tunable version of the dipolar quantum spin glass seen in LiHoxY1−xF4.Specifically, we propose and analyze a system composed of dysprosium atoms embedded in solid helium. We describe the phase diagram of the system and discuss the realizability and detectability of the quantum spin glass and antiglass phases.

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Cold polar molecules in two-dimensional traps: Tailoring interactions with external fields for novel quantum phases

Cited by 215 publications

References 50 publications

New frontiers for quantum gases of polar molecules

New frontiers for quantum gases of polar molecules

d-wave superfluidity in optical lattices of ultracold polar molecules

Controllable quantum spin glasses with magnetic impurities embedded in quantum solids

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