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Oscillating ultracold gases – experimental observation of a Lee-Huang-Yang fluid

PhD defence, monday, 27 September 2021. Thomas Guldager Skov.

2021.09.27 | Karen Konradi

Thomas Guldager Skov

Schematic representation of a Bose-Einstein condensate undergoing monopole oscillations. The condensate is trapped in the focus of three crossing laser beams and the orange coils supply the surrounding magnetic field.

During his PhD studies, Thomas Guldager Skov researched the collective behavior of ultracold atomic gases. When an atomic gas is cooled to extremely low temperatures, the quantum mechanical nature of the atoms reveals itself and they can form a Bose-Einstein condensate where a large number of particles occupy the quantum mechanical ground state of the system. By making the system oscillate and measuring the resulting frequency, Thomas Guldager Skov investigated how the internal interactions of the condensate influences its collective dynamics. The research focused on a particular example, called a Lee-Huang-Yang fluid, where the interactions are governed by so-called quantum fluctuations and their effect was observable in the oscillation frequency.

The results contribute to an increased understanding of quantum mechanical many-body systems and pave the way for new experiments utilizing the special interactions of the Lee-Huang-Yang fluid.

The PhD study was completed at Department of Physics and Astronomy, Faculty of Natural Sciences, Aarhus University.

This summary was prepared by the PhD student.

Time: Monday, 27 September 2021 at 11:00
Place:  Building 1532, room 116, Lecture Theatre G1, Department of Mathematics, Aarhus University, Ny Munkegade 118, 8000 Aarhus C.    
Title of PhD thesis: Observation of a Lee-Huang-Yang Fluid

Contact information: Thomas Guldager Skov, e-mail: tg.skov@phys.au.dk, tel.: +45 60216734

Members of the assessment committee:

Associate Professor Marco Fattori, European Laboratory for Non-Linear Spectroscopy, University of Florence, Italy

Dr. Tim Langen, 5th Institute of Physics, University of Stuttgart, Germany

Professor Steen Hannestad (chairman), Department of Physics and Astronomy, Aarhus University, Denmark

Main supervisor:
Associate Professor Jan Joachim Arlt, Department of Physics and Astronomy, Aarhus University, Denmark

Language: The PhD dissertation will be defended in English

The defence is public.
Due to the coronavirus situation, the PhD thesis will not be available for reading at the offices of the PhD administration. Instead, interested parties may send an e-mail to gradschool.nat@au.dk to receive a digital copy of the PhD thesis. Please note, it may in certain cases be necessary to make an individual arrangement to read the PhD thesis.

PhD defence
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