Collisions of Ultracold Trapped Cesium Feshbach Molecules

Abstract

We study collisions in an optically trapped, pure sample of ultracold Cs${}_2$ molecules in various internal states. The molecular gas is created by Feshbach association from a near-degenerate atomic gas, with adjustable temperatures in the nanokelvin range. We identify several narrow loss resonances, which point to the coupling to more complex molecular states and may be interpreted as Feshbach resonances in dimer-dimer interactions. Moreover, in some molecular states we observe a surprising temperature dependence in collisional loss. This shows that the situation cannot be understood in terms of the usual simple threshold behavior for inelastic two-body collisions. We interpret this observation as further evidence for a more complex molecular structure beyond the well-understood dimer physics.

To appear in Laser Physics, special issue in memoriam Prof. Vladilen S. Letokhov

References in corpus (27)

• Many-Body Physics with Ultracold Gases
• Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
• Theory of ultracold Fermi gases
• A High Phase-Space-Density Gas of Polar Molecules
• Production of cold molecules via magnetically tunable Feshbach resonances
• Observation of Bose-Einstein Condensation of Molecules
• Strong dissipation inhibits losses and induces correlations in cold molecular gases
• Quantum Gas of Deeply Bound Ground State Molecules
• Ultracold Molecules in the Ro-Vibrational Triplet Ground State
• Formation of Quantum-Degenerate Sodium Molecules
• Observation of an Efimov-like resonance in ultracold atom-dimer scattering
• Evidence for Universal Four-Body States Tied to an Efimov Trimer
• Universal Properties of the Four-Body System with Large Scattering Length
• Two-dimensional Bose-Einstein condensate in an optical surface trap
• Fast, Runaway Evaporative Cooling to Bose-Einstein Condensation in Optical Traps
• Collisional Properties of p-Wave Feshbach Molecules
• Determination of atomic scattering lengths from measurements of molecular binding energies near Feshbach resonances
• Optimized production of a cesium Bose-Einstein condensate
• Spectroscopy of Ultracold, Trapped Cesium Feshbach Molecules
• `Stückelberg interferometry' with ultracold molecules
• Cruising through molecular bound state manifolds with radio frequency
• Collisions between tunable halo dimers: exploring an elementary four-body process with identical bosons
• Efficient creation of molecules from a cesium Bose-Einstein condensate
• Avoided crossings between bound states of ultracold Cesium dimers
• Collisional decay of 87Rb Feshbach molecules at 1005.8 G
• Metastable Feshbach Molecules in High Rotational States
• Suppression of molecular decay in ultracold gases without Fermi statistics

Cited by in corpus (8)

• Ultracold Dipolar Molecules Composed of Strongly Magnetic Atoms
• Atomic Bose-Einstein condensate to molecular Bose-Einstein condensate transition
• A Feshbach resonance in collisions between ultracold ground state molecules
• Resonant atom-dimer collisions in cesium: Testing universality at positive scattering lengths
• Coqblin-Schrieffer Model for an Ultra-cold Gas of Ytterbium atoms with Metastable States
• Rotational-state purity of Stark-decelerated molecular beams
• Universal Bound States of Two Particles in Mixed Dimensions or Near a Mirror
• Repeated output coupling of ultracold Feshbach molecules from a Cs BEC