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AuthorNandi, Gerritdc.contributor.author
Date of accession2016-03-14T13:39:45Zdc.date.accessioned
Available in OPARU since2016-03-14T13:39:45Zdc.date.available
Year of creation2007dc.date.created
AbstractIn this thesis, we study the dynamics of ultracold quantum gases with respect to micro-gravity experiments, discuss interferometric applications and aspects on collective scattering. We describe the dynamics of an ultracold quantum gas in a long-distance free-fall experiment, which is of relevance for the present QUANTUS experiment. We develop the quantum field theoretical description of a trapped, interacting degenerate quantum gas in a drop experiment in an inertial frame, the corotating frame of the Earth and the comoving frame of the drop capsule. This formalism provides us with an efficient description of the experiment, especially for numerical studies. Moreover, we review the ideas of gravitational sensing with the help of an interferometric setup. We show that in case of a spatially quasi-homogeneous condensate the same results as in single-atom interferometry can be obtained even in the presence of a nonlinear time evolution. A decline of the contrast in an interferogram is found, though. In addition, we propose a rotational sensor based on a superposition of a non-rotating state and a quantized vortex in a Bose-Einstein condensate. As an application for an interferometric experiment in a micro-gravity environment, we establish a number filter for matter waves. Our number filter allows for a number stabilization, i.e. after passing the filter, the number uncertainty is less than before. This can be achieved by using a nonlinear matter wave interferometer for a two-component BEC. An asymmetric splitting is required in order to observe the effect. Finally, we examine the collective scattering of a superfluid droplet impinging on a two-component Bose-Einstein condensate. We demonstrate that this mesoscopic scenario matches the microscopic setup for Feshbach scattering of two particles. We obtain resonant scattering phase shifts from a linear response theory. We find an energy-dependent transmission coefficient that is controllable between 0 and 100%.dc.description.abstract
Languageendc.language.iso
PublisherUniversität Ulmdc.publisher
LicenseStandard (Fassung vom 03.05.2003)dc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v1dc.rights.uri
KeywordBogoliubov modesdc.subject
KeywordDegenerate quantum gasesdc.subject
KeywordInertial sensingdc.subject
KeywordMatter wave interferometrydc.subject
KeywordMicro-gravitydc.subject
KeywordNumber squeezingdc.subject
KeywordNumber stabilizationdc.subject
KeywordRotational sensingdc.subject
KeywordUltracold quantum gasesdc.subject
KeywordVortex: Physicsdc.subject
Dewey Decimal GroupDDC 530 / Physicsdc.subject.ddc
LCSHBose-Einstein condensationdc.subject.lcsh
LCSHInterferometrydc.subject.lcsh
TitleDynamics of Ultracold Quantum Gases and Interferometry with Coherent Matter Wavesdc.title
Resource typeDissertationdc.type
DOIhttp://dx.doi.org/10.18725/OPARU-505dc.identifier.doi
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-vts-59483dc.identifier.urn
GNDFeshbach-Resonanzdc.subject.gnd
FacultyFakultät für Naturwissenschaftenuulm.affiliationGeneral
Date of activation2007-07-04T09:09:40Zuulm.freischaltungVTS
Peer reviewneinuulm.peerReview
Shelfmark print versionZ: J-H 11.699 ; W: W-H 9.899uulm.shelfmark
DCMI TypeTextuulm.typeDCMI
VTS ID5948uulm.vtsID
CategoryPublikationenuulm.category
Bibliographyuulmuulm.bibliographie


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