A Single Atom Thermometer for Ultracold Gases
| Autor: | Artur Widera, Farina Kindermann, Daniel Mayer, Tobias Lausch, Michael Hohmann, Felix Schmidt |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Atomic Physics (physics.atom-ph) Quantum gas Monte Carlo method FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas Physics - Atomic Physics Quantum Gases (cond-mat.quant-gas) Thermometer 0103 physical sciences Thermal Atom Physics::Atomic and Molecular Clusters Physics::Atomic Physics Atomic physics 010306 general physics Condensed Matter - Quantum Gases |
| Zdroj: | Web of Science |
| Popis: | We use single or few Cs atoms as thermometer for an ultracold, thermal Rb cloud. Observing the thermometer atoms' thermalization with the cold gas using spatially resolved fluorescence detection, we find an interesting situation, where a fraction of thermometer atoms thermalizes with the cloud while the other fraction remains unaffected. We compare release-recapture measurements of the thermometer atoms to Monte-Carlo simulations while correcting for the non-thermalized fraction, and recover the cold cloud's temperature. The temperatures obtained are verified by independent time-of-flight measurements of the cold cloud's temperature. We also check the reliability of our simulations by first numerically modelling the unperturbed in-trap motion of single atoms in absence of the cold cloud, and second by performing release-recapture thermometry on the cold cloud itself. Our findings pave the way for local temperature probing of quantum systems in non-equilibrium situations. |
| Databáze: | OpenAIRE |
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