Jun-Ru Li
National Institute of Standards and Technology
ResonanceCouplingSupersolidOpticsPhysicsThermalisationChemical physicsDipoleMaterials scienceSuperfluidityCondensed matter physicsMoleculeBose–Einstein condensateMolecular physicsElectric fieldChemical polarityDegenerate energy levelsQuantum phasesSpin-½QuantumFermi gas
26Publications
7H-index
621Citations
Publications 23
Newest
#1Jun-Ru LiH-Index: 7
#2William G. TobiasH-Index: 3
Last. John L. BohnH-Index: 62
view all 11 authors...
#1William G. TobiasH-Index: 3
#2Jun-Ru LiH-Index: 7
Last. Jun YeH-Index: 126
view all 6 authors...
#1Thomas BilitewskiH-Index: 8
#2Luigi De MarcoH-Index: 15
Last. Ana Maria ReyH-Index: 62
view all 8 authors...
We study a bulk fermionic dipolar molecular gas in the quantum degenerate regime confined in a two-dimensional geometry. Using two rotational states of the molecules, we encode a spin 1/2 degree of freedom. To describe the many-body spin dynamics of the molecules, we derive a long-range interacting XXZ model valid in the regime where motional degrees of freedom are frozen. Because of the spatially extended nature of the harmonic oscillator modes, the interactions in the spin model are very long ...
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#1Jun-Ru Li (NIST: National Institute of Standards and Technology)H-Index: 7
#2William G. Tobias (NIST: National Institute of Standards and Technology)H-Index: 3
Last. John L. Bohn (NIST: National Institute of Standards and Technology)H-Index: 62
view all 11 authors...
Ultracold polar molecules possess long-range, anisotropic, and tunable dipolar interactions, providing the opportunities to probe quantum phenomena inaccessible with existing cold gas platforms. However, experimental progress has been hindered by the dominance of two-body loss over elastic interactions, which prevents efficient evaporative cooling. Though recent work has demonstrated controlled interactions by confining molecules to a two-dimensional geometry, a general approach for tuning molec...
Source
#1Jun-Ru LiH-Index: 7
#2William G. TobiasH-Index: 3
Last. Jun YeH-Index: 126
view all 11 authors...
Ultracold polar molecules possess long-range, anisotropic, and tunable dipolar interactions, providing unique opportunities to probe novel quantum phenomena. However, experimental progress has been hindered by excessive two-body loss, which also limits further cooling via evaporation. Recent work shows the loss can be mitigated by confining molecules in a two-dimensional geometry. However, a general approach for tuning molecular interactions in a full three-dimensional (3D) stable system has bee...
#1Kyle Matsuda (NIST: National Institute of Standards and Technology)H-Index: 9
#2Luigi De Marco (NIST: National Institute of Standards and Technology)H-Index: 15
Last. Jun Ye (NIST: National Institute of Standards and Technology)H-Index: 126
view all 7 authors...
Full control of molecular interactions, including reactive losses, would open new frontiers in quantum science. We demonstrate extreme tunability of ultracold chemical reaction rates by inducing resonant dipolar interactions by means of an external electric field. We prepared fermionic potassium-rubidium molecules in their first excited rotational state and observed a modulation of the chemical reaction rate by three orders of magnitude as we tuned the electric field strength by a few percent ac...
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#1Giacomo Valtolina (NIST: National Institute of Standards and Technology)H-Index: 11
#2Kyle Matsuda (NIST: National Institute of Standards and Technology)H-Index: 9
Last. Jun Ye (NIST: National Institute of Standards and Technology)H-Index: 126
view all 6 authors...
The control of molecules is key to the investigation of quantum phases, in which rich degrees of freedom can be used to encode information and strong interactions can be precisely tuned1. Inelastic losses in molecular collisions2-5, however, have greatly hampered the engineering of low-entropy molecular systems6. So far, the only quantum degenerate gas of molecules has been created via association of two highly degenerate atomic gases7,8. Here we use an external electric field along with optical...
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#1Kyle MatsudaH-Index: 9
#2Luigi De MarcoH-Index: 15
Last. Jun YeH-Index: 126
view all 7 authors...
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#8Jun Ye (NIST: National Institute of Standards and Technology)H-Index: 126
#9Ana Maria Rey (NIST: National Institute of Standards and Technology)H-Index: 62
We design dipolar quantum many-body Hamiltonians that will facilitate the realization of exotic quantum phases under current experimental conditions achieved for polar molecules. The main idea is to modulate both single-body potential barriers and two-body dipolar interactions on a spatial scale of tens of nanometers to strongly enhance energy scales and, therefore, relax temperature requirements for observing new quantum phases of engineered many-body systems. We consider and compare two approa...
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