eprintid: 36739
rev_number: 12
eprint_status: archive
userid: 9090
dir: disk0/00/03/67/39
datestamp: 2025-06-18 13:15:39
lastmod: 2025-06-18 13:16:16
status_changed: 2025-06-18 13:15:39
type: doctoralThesis
metadata_visibility: show
creators_name: Brandstetter, Sandra Anna
title: Collective Behavior in Few-Fermion Systems
subjects: ddc-500
subjects: ddc-530
divisions: i-130200
adv_faculty: af-13
abstract: 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
id_scheme: DOI
id_number: 10.11588/heidok.00036739
own_urn: urn:nbn:de:bsz:16-heidok-367395
date_accepted: 2025-06-05
advisor: HASH(0x55caa0e72d50)
language: eng
bibsort: BRANDSTETTCOLLECTIVE2025
full_text_status: public
place_of_pub: Heidelberg
citation:   Brandstetter, Sandra Anna  (2025) Collective Behavior in Few-Fermion Systems.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/36739/1/thesis.pdf