John L. Bohn
University of Colorado Boulder
Ultracold atomMagnetic fieldPhysicsDipoleAtomic physicsScatteringMaterials scienceCondensed matter physicsQuantum electrodynamicsMoleculeScattering lengthBose–Einstein condensateFeshbach resonanceMolecular physicsElectric fieldChemical polarityQuantum mechanicsGround stateQuantum
278Publications
62H-index
7,999Citations
Publications 258
Newest
#1Eli J. Halperin (CU: University of Colorado Boulder)H-Index: 1
#2John L. Bohn (CU: University of Colorado Boulder)H-Index: 62
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#1Goulven QuéménerH-Index: 31
#2James F. E. CroftH-Index: 10
Last. John L. BohnH-Index: 62
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Recent experiments on ultracold non-reactive dipolar molecules have observed high two-body losses, even though these molecules can undergo neither inelastic, nor reactive (as they are in their absolute ground state), nor light-assisted collisions (if they are measured in the dark). In the presence of an electric field these losses seem to be near universal (the probability of loss at short-range is near unity) while in the absence of it the losses seem non-universal. To explain these observation...
We apply a hyperspherical formulation to a trapped Bose-Einstein condensate with dipolar and contact interactions. Central to this approach is a general correspondence between K-harmonic hyperspherical methods and a suitable Gaussian ansatz to the Gross-Pitaevskii equation, regardless of the form of the interparticle potential. This correspondence allows one to obtain hyperspherical potential energies for a wide variety of physical problems. In the case of the dipolar Bose-Einstein condensate, t...
We study collisional rethermalization in ultracold dipolar thermal gases, made intricate by their anisotropic differential cross sections. Theoretical methods are provided to derive the number of collisions per rethermalization, which for dipolar gases, is highly dependent on the dipole alignment axis. These methods are formulated to be easily applied in experimental contexts, even reducing to analytic expressions if the route to thermal equilibrium is governed by short-time dynamics. In the ana...
Source
#1Jun-Ru LiH-Index: 7
#2William G. TobiasH-Index: 3
Last. John L. BohnH-Index: 62
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#1Joseph E. McCann (CU: University of Colorado Boulder)H-Index: 5
#2John L. BohnH-Index: 62
Last. Lucie D. AugustovičováH-Index: 7
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Loosely bound van der Waals dimers of lanthanide atoms, as might be obtained in ultracold atom experiments, are investigated. These molecules are known to exhibit a degree of quantum chaos, due to the strong anisotropic mixing of their angular spin and rotation degrees of freedom. Within a model of these molecules, we identify different realms of this anisotropic mixing, depending on whether the spin, the rotation, or both, are significantly mixed by the anisotropy. These realms are in turn gene...
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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
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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...
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#1Jun-Ru LiH-Index: 7
#2William G. TobiasH-Index: 3
Last. Jun YeH-Index: 126
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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...
#1Reuben R. W. WangH-Index: 3
#2Andrew SykesH-Index: 8
Last. John L. BohnH-Index: 62
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We study the nonequilibrium dynamics of an ultracold, non-degenerate dipolar gas of ^{164}y atoms in a cylindrically symmetric harmonic trap. To do so, we investigate the normal modes and linear response of the gas when driven by means of periodic modulations to the trap axial-frequency. We find that the resonant response of the gas depends strongly on the dipole alignment axis, owing to anisotropies in the differential cross section of the atoms. We employ the use of the method of averages a...
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Ultracold collisions of LiO molecules in the ^{2}\Pi_{3/2}ground state are considered, under the influence of either an external magnetic or electric field. Inelastic collisions are shown to be suppressed in the presence of modest laboratory strength magnetic and electric fields. The rate of elastic collisions that rethermalize the thermal distribution, and the corresponding low rate of heating state-changing collisions, suggest that quantum degeneracy or even molecular Bose-Einstein condensa...
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