title: Collective Behavior in Few-Fermion Systems
creator: Brandstetter, Sandra Anna
subject: ddc-500
subject: 500 Natural sciences and mathematics
subject: ddc-530
subject: 530 Physics
description: This thesis reports on the exploration of collective behavior in a system of few fermionic atoms.  Access to both real- and momentum space observables in combination with a high degree of  control over both particle number and interaction strength allows us to explore the emergence  of collective behavior from the bottom up - atom by atom.  Inspired by observations in high-energy physics, where hydrodynamic behavior is present in  absence of a separation of scales, we explore interaction-driven elliptic flow which is commonly  considered a smoking-gun of hydrodynamic behavior. Our measurements reveal elliptic flow in  systems of only six constituents.  Motivated by the formation of pairs of fermionic particles in system with broken translational  symmetry (such as atomic nuclei or ’dirty’ superconductors), where BCS theory does not apply,  we investigate how a spatially varying potential affects pair formation. By altering interaction  strength and particle number, we observe a transition from a regime in which pair formation  is determined by the discrete level structure of the potential to a regime in which the potential  only influences pairing by altering the local density.
date: 2025
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserver/36739/1/thesis.pdf
identifier: DOI:10.11588/heidok.00036739
identifier: urn:nbn:de:bsz:16-heidok-367395
identifier:   Brandstetter, Sandra Anna  (2025) Collective Behavior in Few-Fermion Systems.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/36739/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng