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Splitting and recombination of bright-solitary-matter waves [dataset] Open Access

This thesis presents the very first experimental realisation of splitting and recombination of robust bright-solitary-matter waves on a narrow repulsive potential barrier. This system has intrinsic interest for fundamental studies of soliton phase and for the realisation of a soliton interferometer. An upgraded imaging system is presented, which is capable of imaging the bright-solitary-matter waves in-situ and across a wide range of magnetic fields. The system uses a combination of an offset-locked imaging laser, a high-intensity probe beam and a microwave-transfer adiabatic rapid passage of the atoms to an auxiliary imaging state which has favourable transition properties. BECs of Rb-85 are created by direct evaporative cooling, using an upgraded crossed optical dipole trap. Condensates of up to 7000 atoms are created, with greater than 80% purity. We develop a wavefunction engineering protocol, which allows us to transfer the condensate into a quasi-1D potential and systematically demonstrate regions of interatomic interactions where bright-solitary-matter waves can be formed, as well as regions where condensate collapse or breathing-mode phenomena are observed. The bright-solitary-matter waves are very robust, propagating without measurable dispersion for over 20s. The splitting of a soliton into two daughter solitons on a narrow blue-detuned optical potential is presented. We demonstrate full control over the transmission coefficient by varying the barrier height. Velocity selection between the outgoing daughter solitons is observed and quantified, whereby the transmitted daughter soliton always has a higher centre of mass kinetic energy than the reflected daughter soliton. Velocity-selection-mediated recombination on a wide barrier is demonstrated, as well as interference-mediated recombination on a narrow barrier. We observe large shot-to-shot fluctuations for the narrow barrier which are fully consistent with independently-determined uncertainties in the barrier position. For the first time we explore this experimentally and theoretically, both with Gross-Pitaevskii simulations and analytical approximations, putting new limits on the required parameters for future phase-sensitive interferometric measurements.

Descriptions

Resource type
Dataset
Contributors
Creator: Wales, Oliver John 1
Contact person: Wales, Oliver John 1
Data collector: Wales, Oliver John 1
Data curator: Wales, Oliver John 1
Editor: Wales, Oliver John 1
1 Durham University, United Kingdom
Funder
Engineering and Physical Sciences Research Council
Research methods
Other description
Keyword
Soliton
Matter-waves
Bose Einstein Condensate
Soliton splitting
Soliton recombination
Interferometry
Subject
Physics
Quantum theory
Location
Language
Cited in
Identifier
ark:/32150/r13t945q78r
doi:10.15128/r13t945q78r
Rights
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA)

Publisher
Durham University
Date Created
November 2019

File Details

Depositor
O.J. Wales
Date Uploaded
Date Modified
27 November 2019, 10:11:46
Audit Status
Audits have not yet been run on this file.
Characterization
File format: zip (ZIP Format)
Mime type: application/zip
File size: 4310240
Last modified: 2019:11:26 19:40:11+00:00
Filename: Thesis data.zip
Original checksum: bca80d532cb3f1cc6ab9580f4acf8c46
Activity of users you follow
User Activity Date
User N. Syrotiuk has updated Splitting and recombination of bright-solitary-matter waves [dataset] 9 days ago
User O.J. Wales has updated Splitting and recombination of bright-solitary-matter waves [dataset] 13 days ago
User O.J. Wales has updated Splitting and recombination of bright-solitary-matter waves [dataset] 13 days ago
User O.J. Wales has updated Splitting and recombination of bright-solitary-matter waves [dataset] 13 days ago
User O.J. Wales has updated Splitting and recombination of bright-solitary-matter waves [dataset] 13 days ago
User O.J. Wales has deposited Thesis data.zip 13 days ago