A tuneable quantum gas for matter wave interferometry and soliton experiments

Student thesis: Doctoral Thesis

Abstract

The thesis reports on two strands of experiments in which we employ Bose-Einstein condensates of caesium atoms. Caesium provides favourable scattering properties due to a rich spectrum of magnetic Feshbach resonances at low fields. In particular, we take advantage of the tunability of the interaction strength to implement experiments to study matter-wave interferometry and solitons.In a first series of experiments, we employ a magnetic levitation scheme and the tunability of caesium BEC to measure micro-g accelerations by using atomic interferometry, demonstrating free-evolution times of 1 s. We analyse the intrinsic effects of the curvature of our force field due to the magnetic levitation, and we observe the effects of a phase-shifting element in the interferometer paths.In the second series of experiments, we exploit the tunability of our Bose-Einstein condensate to generate bright matter-wave solitons in quasi-1D geometry.We study the fundamental breathing mode frequency of a single matter-wave soliton by measuring its oscillation frequency as a function of the atom number and confinement strength and we observe signatures of the creation of secondorder solitons.Aside from introducing some general concepts of ultra-cold atomic collisions and BECs, I also present a brief overview of the experimental apparatus. This includes details of the vacuum setup, laser cooling, magnetic field coils and diagnostic procedures, and sequence for generating BECs of caesium atoms.
Date of Award17 Jan 2020
Original languageEnglish
Awarding Institution
  • University Of Strathclyde
SponsorsUniversity of Strathclyde
SupervisorElmar Haller (Supervisor) & Stefan Kuhr (Supervisor)

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