Atomic Clock Measurements of Quantum Scattering Phase Shifts Spanning Feshbach Resonances at Ultralow Fields

Abstract

We use an atomic fountain clock to measure quantum scattering phase shifts precisely through a series of narrow, low-field Feshbach resonances at average collision energies below $1\mu$K. Our low spread in collision energy yields phase variations of order $\pm \pi /2$ for target atoms in several $F,m_F$ states. We compare them to a theoretical model and establish the accuracy of the measurements and the theoretical uncertainties from the fitted potential. We find overall excellent agreement, with small statistically significant differences that remain unexplained.

References in corpus (18)

• Feshbach Resonances in Ultracold Gases
• The dynamics of component separation in a binary mixture of Bose-Einstein condensates
• Creation of ultracold molecules from a Fermi gas of atoms
• Dynamical response of a Bose-Einstein condensate to a discontinuous change in internal state
• Precision measurement of spin-dependent interaction strengths for spin-1 and spin-2 87Rb atoms
• Precision measurements of s-wave scattering lengths in a two-component Bose-Einstein condensate
• Feshbach resonances in ultracold atomic and molecular collisions: threshold behaviour and suppression of poles in scattering lengths
• Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields
• Controlling the cold collision shift in high precision atomic interferometry
• Interferometric determination of the s- and d-wave scattering amplitudes in ${}^{87}$Rb
• Imaging of s and d partial-wave interference in quantum scattering of identical bosonic atoms
• Enhancement of variation of fundamental constants in ultracold atom and molecule systems near Feshbach resonances
• Feshbach Spectroscopy of a Shape Resonance
• A Quantum Scattering Interferometer
• Feshbach resonances in Cesium at Ultra-low Static Magnetic Fields
• Sensitivity to alpha-variation in ultracold atomic-scattering experiments
• Quantum Scattering of Distinguishable Bosons using an Ultracold Atom Collider
• Direct Observation of Resonant Scattering Phase Shifts and their Energy Dependence

Cited by in corpus (4)

• Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks
• Tailored single-atom collisions at ultra-low energies
• Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers
• High-precision analysis of Feshbach resonances in a Mott insulator