Towards faster Production of Strongly Interacting Bose Gases. Optical Gray Molasses Cooling of Potassium-39

Maximilian Sohmen

• Publisher: GRIN Verlag
• Edition: 1
• Year: 2019
• Topic: Physical Sciences
• Subtopic: Physics
• eBook ISBN:
  9783668983670
• Index: Physics

Venture into the quantum realm where matter behaves in ways that defy everyday intuition. This groundbreaking study unlocks the secrets of ultracold ³⁹K Bose gases, exploring their exotic properties and pushing the boundaries of atomic physics. Delve into the unitary regime, where interatomic interactions reach their maximum, giving rise to fascinating phenomena such as the Efimov effect and complex three-body correlations. Witness the direct measurement of contact densities C2 and C3, providing a quantitative understanding of these intricate quantum relationships. Observe the hydrodynamic behavior of a unitary thermal Bose gas as it undergoes rapid changes, revealing unexpected deviations from established theoretical models at high phase-space densities, hinting at the need for a deeper understanding of these systems. Beyond theoretical explorations, discover a novel and highly efficient technique for fast cooling of potassium atoms using optical gray molasses. This innovative approach enables the rapid cooling of approximately 2 x 10¹⁰ atoms from 350 ?K to an astonishing 8 ?K in a mere 10 milliseconds, opening new avenues for the creation and manipulation of ultracold quantum matter. Explore the intricate details of this cooling process, including the critical role of laser frequency detuning and light intensity. Follow the journey as these ultracold atoms are prepared for further experimentation through optical pumping, magnetic transport, and trapping in an optical dipole trap. This research not only advances our fundamental understanding of ultracold Bose gases but also provides valuable tools and techniques for future explorations in quantum science and technology. Ideal for researchers and students alike, this work provides critical insights into ultracold physics, quantum many-body physics, and the exciting possibilities of manipulating matter at the quantum level. Discover the power of optical gray molasses cooling and its potential to revolutionize the field of ultracold atomic physics, paving the way for groundbreaking discoveries in areas such as quantum computing and precision measurement. Explore the intricate dance of atoms in the unitary regime, where the Efimov effect reigns supreme and three-body correlations shape the destiny of ultracold Bose gases.

Table of contents

• Abstract
• Acknowledgements
• Cold Atoms, and why they are Interesting—An Introduction
• Atom–Light Interactions
• Atom–Atom Interactions: A Plaidoyer for K-39
• Quantum Many-Body Physics with K-39
• Gray-Molasses Cooling
• Experimental Realisation of the D1-Cooling System
• Current Work: From the MOT Chamber to the Science Cell
• Conclusion & Outlook
• Appendix