期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.253201
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We present, and derive analytic expressions for, a fundamental limit to the sympathetic cooling of ions in radio-frequency traps using cold atoms. The limit arises from the work done by the trap electric field during a long-range ion-atom collision and applies even to cooling by a zero-temperature atomic gas in a perfectly compensated trap. We conclude that in current experimental implementations, this collisional heating prevents access to the regimes of single-partial-wave atom-ion interaction or quantized ion motion. We determine conditions on the atom-ion mass ratio and on the trap parameters for reaching the s-wave collision regime and the trap ground state. DOI: 10.1103/PhysRevLett.109.253201
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