Continuous Loading of an Electrostatic Trap for Polar Molecules

Rieger, Thomas; Junglen, Tobias; Rangwala, S. A.; Pinkse, Pepijn W. H.; Rempe, Gerhard

doi:10.1103/physrevlett.95.173002

Cited by 103 publications

(83 citation statements)

References 20 publications

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“…These ground state can be distinguished by the bond observable in Eq. (19). Therefore, we obtain a two-fold degenerate phase with a broken translational symmetry: the bond correlation function exhibits a long range order at the wave vector k = π/a, while the density n j remains uniform in this phase.…”

Section: Three-body Interactions In 1dmentioning

confidence: 85%

Three-body interactions with cold polar molecules

Büchler¹,

Micheli²,

Zoller³

2007

Nature Phys

280

319

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We show that polar molecules driven by microwave fields give naturally rise to strong three-body interactions, while the two-particle interaction can be independently controlled and even switched off. The derivation of these effective interaction potentials is based on a microscopic understanding of the underlying molecular physics, and follows from a well controlled and systematic expansion into many-body interaction terms. For molecules trapped in an optical lattice, we show that these interaction potentials give rise to Hubbard models with strong nearest-neighbor two-body and three-body interaction. As an illustration, we study the one-dimensional Bose-Hubbard model with dominant three-body interaction and derive its phase diagram.Fundamental interactions between particles, such as the Coulomb law, involves pairs of particles, and our understanding of the plethora of phenomena in condensed matter physics rests on models involving effective twobody interactions. On the other hand, exotic quantum phases, such as topological phases or spin liquids, are often identified as ground states of Hamiltonians with three or more body terms. While the study of these phases and properties of their excitations is presently one of the most exciting developments in theoretical condensed matter physics, it is difficult to identify real physical systems exhibiting such properties -a noticeable exception being the Fractional Quantum Hall effect. Here we show that polar molecules in optical lattices driven by microwave fields give naturally rise to Hubbard models with strong nearest-neighbor three-body interactions, while the twobody terms can be tuned (even switched off) with external fields.The many-body Hamiltonians underlying condensed matter physics are derived within an effective low energy theory, obtained by integrating out the high energy excitations. In general, this gives rise to interaction termswhere V (r) describes the two-particle interaction depending only on the separation between the particles. The second term W (r i , r j , r k ) is the three-body interaction, which depends on the distance and orientation of three particles, and vanishes if one particle is far apart from the other two. The ellipsis denotes possible higher many-body term terms. While for Helium atoms in the context of superfluidity the two-particle interaction dominates and determines the ground state properties with the three-body interactions providing small corrections, 1 model Hamiltonians with strong three-body interactions have attracted a lot of interest in the search for microscopic Hamiltonians exhibiting exotic ground state properties. Well known examples are the fractional quantum Hall states described by the Pfaffian wave functions which appear as ground states of a Hamiltonian with three-body interaction. 2,3,4 These topological phases admit anyonic excitations with non-abelian braiding statistic. Of special interest are also spin systems and bosonic Hamiltonians with complex many-body interactions, such as ring exchange model, whic...

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Section: Three-body Interactions In 1dmentioning

confidence: 85%

Three-body interactions with cold polar molecules

Büchler¹,

Micheli²,

Zoller³

2007

Nature Phys

280

319

View full text Add to dashboard Cite

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“…This could be done in the small gap between the exit of the cell and the first guide segment. With an extension to a large-volume electric trap [34], collision studies could be realized. Slow molecules from the same or different species could be brought into collision under controlled conditions [35].…”

Section: Discussionmentioning

confidence: 99%

Continuous guided beams of slow and internally cold polar molecules

et al. 2009

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We describe the combination of buffer-gas cooling with electrostatic velocity filtering to produce a high-flux continuous guided beam of internally cold and slow polar molecules. In a previous paper (L.D. van Buuren et al., arXiv: 0806.2523v1) we presented results on density and state purity for guided beams of ammonia and formaldehyde using an optimized set-up. Here we describe in more detail the technical aspects of the cryogenic source, its operation, and the optimization experiments that we performed to obtain best performance. The versatility of the source is demonstrated by the production of guided beams of different molecular species.

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“…Figure 2(c) and 2(d) shows that as the loading time exceeds the trap lifetime the signal height saturates and there is no longer any significant increase in the number of trapped molecules, as expected. Continuous loading of a roomtemperature electrostatic trap has been demonstrated previously [38]. Trapping is spectroscopically verified by tuning the LIF laser to be resonant with high-field-seeking (HFS) molecules and comparing time profiles to low-field seekers (LFS).…”

Section: Prl 98 213001 (2007) P H Y S I C a L R E V I E W L E T T E mentioning

confidence: 98%

Magnetic Trapping and Zeeman Relaxation of NH (X Σ−3)

et al. 2007

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Imidogen (NH) radicals are magnetically trapped and their Zeeman relaxation and energy transport collision cross sections with helium are measured. Continuous buffer-gas loading of the trap is direct from a room-temperature molecular beam. The Zeeman relaxation (inelastic) cross section of magnetically trapped electronic, vibrational and rotational ground state imidogen in collisions with 3 He is measured to be 3.8 ± 1.1 × 10 −19 cm 2 at 710 mK. The NH-He energy transport cross section is also measured, indicating a ratio of diffusive to inelastic cross sections of γ = 7 × 10 4 , in agreement with recent theory [1].

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Continuous Loading of an Electrostatic Trap for Polar Molecules

Cited by 103 publications

References 20 publications

Three-body interactions with cold polar molecules

Three-body interactions with cold polar molecules

Continuous guided beams of slow and internally cold polar molecules

Magnetic Trapping and Zeeman Relaxation of NH (X Σ−3)

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