Phase-locking between different partial-waves in atom-ion spin-exchange collisions

Abstract

We present a joint experimental and theoretical study of spin dynamics of a single ${}^{88}$Sr${}^{+}$ ion colliding with an ultracold cloud of Rb atoms in various hyperfine states. While spin-exchange between the two species occurs after 9.1(6) Langevin collisions on average, spin-relaxation of the Sr${}^{+}$ ion Zeeman qubit occurs after 48(7) Langevin collisions which is significantly slower than in previously studied systems due to a small second-order spin-orbit coupling. Furthermore, a reduction of the endothermic spin-exchange rate was observed as the magnetic field was increased. Interestingly, we found that, while the phases acquired when colliding on the spin singlet and triplet potentials vary largely between different partial waves, the singlet-triplet phase difference, which determines the spin-exchange cross-section, remains locked to a single value over a wide range of partial-waves which leads to quantum interference effects.

5 pages, 5 figures and Supplemental Material

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Cited by in corpus (25)

• Cold hybrid ion-atom systems
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• Complete quantum coherent control of ultracold molecular collisions
• Ab initio electronic structure and prospects for the formation of ultracold calcium--alkali-metal-atom molecular ions
• Signature of the $s$-wave regime high above ultralow temperatures
• Quantum-Logic Detection of Chemical Reactions
• Impact of ion motion on atom-ion confinement-induced resonances in hybrid traps
• State-selective coherent motional excitation as a new approach for the manipulation, spectroscopy and state-to-state chemistry of single molecular ions
• Magnetic tuning of ultracold barrierless chemical reactions
• Ultracold ion-atom experiments: cooling, chemistry, and quantum effects
• Compound atom-ion Josephson junction: Effects of finite temperature and ion motion
• Rotational state-changing collisions between N${}_2^{+}$ and Rb at low energies
• Strong angular-momentum mixing in ultracold atom-ion excitation-exchange
• Ion loss events in a cold Rb-Ca${}^{+}$ hybrid trap: photodissociation, black-body radiation and non-radiative charge exchange
• Observation of the P-wave Shape Resonance
• Universality of Efimov states in highly mass-imbalanced cold-atom mixtures with van der Waals and dipole interactions
• Enhanced coupling of electron and nuclear spins by quantum tunneling resonances
• Quantum control of ion-atom collisions beyond the ultracold regime
• Selective quantum Zeno effect of ultracold atom-molecule scattering in dynamic magnetic fields
• Interactions and charge transfer dynamics of an Al${}^{+}$ ion immersed in ultracold Rb and Sr atoms
• Cold collisions between alkali and alkaline-earth hetero nuclear atom-ion system Li + Ba${}^{+}$
• Near-threshold scaling of resonant inelastic collisions at ultralow temperatures
• Quantum suppression of cold reactions far from the s-wave energy limit
• Thermal Atom-Ion Collisions in K-Yb${}^{+}$ Hybrid System
• Rigorous quantum calculations for atom-molecule chemical reactions in electric fields: from single to multiple partial wave regimes