---
_id: '13278'
abstract:
- lang: eng
  text: We present a numerical analysis of spin-1/2 fermions in a one-dimensional
    harmonic potential in the presence of a magnetic point-like impurity at the center
    of the trap. The model represents a few-body analogue of a magnetic impurity in
    the vicinity of an s-wave superconductor. Already for a few particles we find
    a ground-state level crossing between sectors with different fermion parities.
    We interpret this crossing as a few-body precursor of a quantum phase transition,
    which occurs when the impurity "breaks" a Cooper pair. This picture is further
    corroborated by analyzing density-density correlations in momentum space. Finally,
    we discuss how the system may be realized with existing cold-atoms platforms.
article_number: '006'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Lukas
  full_name: Rammelmüller, Lukas
  last_name: Rammelmüller
- first_name: David
  full_name: Huber, David
  last_name: Huber
- first_name: Matija
  full_name: Čufar, Matija
  last_name: Čufar
- first_name: Joachim
  full_name: Brand, Joachim
  last_name: Brand
- first_name: Hans-Werner
  full_name: Hammer, Hans-Werner
  last_name: Hammer
- first_name: Artem
  full_name: Volosniev, Artem
  id: 37D278BC-F248-11E8-B48F-1D18A9856A87
  last_name: Volosniev
  orcid: 0000-0003-0393-5525
citation:
  ama: Rammelmüller L, Huber D, Čufar M, Brand J, Hammer H-W, Volosniev A. Magnetic
    impurity in a one-dimensional few-fermion system. <i>SciPost Physics</i>. 2023;14(1).
    doi:<a href="https://doi.org/10.21468/scipostphys.14.1.006">10.21468/scipostphys.14.1.006</a>
  apa: Rammelmüller, L., Huber, D., Čufar, M., Brand, J., Hammer, H.-W., &#38; Volosniev,
    A. (2023). Magnetic impurity in a one-dimensional few-fermion system. <i>SciPost
    Physics</i>. SciPost Foundation. <a href="https://doi.org/10.21468/scipostphys.14.1.006">https://doi.org/10.21468/scipostphys.14.1.006</a>
  chicago: Rammelmüller, Lukas, David Huber, Matija Čufar, Joachim Brand, Hans-Werner
    Hammer, and Artem Volosniev. “Magnetic Impurity in a One-Dimensional Few-Fermion
    System.” <i>SciPost Physics</i>. SciPost Foundation, 2023. <a href="https://doi.org/10.21468/scipostphys.14.1.006">https://doi.org/10.21468/scipostphys.14.1.006</a>.
  ieee: L. Rammelmüller, D. Huber, M. Čufar, J. Brand, H.-W. Hammer, and A. Volosniev,
    “Magnetic impurity in a one-dimensional few-fermion system,” <i>SciPost Physics</i>,
    vol. 14, no. 1. SciPost Foundation, 2023.
  ista: Rammelmüller L, Huber D, Čufar M, Brand J, Hammer H-W, Volosniev A. 2023.
    Magnetic impurity in a one-dimensional few-fermion system. SciPost Physics. 14(1),
    006.
  mla: Rammelmüller, Lukas, et al. “Magnetic Impurity in a One-Dimensional Few-Fermion
    System.” <i>SciPost Physics</i>, vol. 14, no. 1, 006, SciPost Foundation, 2023,
    doi:<a href="https://doi.org/10.21468/scipostphys.14.1.006">10.21468/scipostphys.14.1.006</a>.
  short: L. Rammelmüller, D. Huber, M. Čufar, J. Brand, H.-W. Hammer, A. Volosniev,
    SciPost Physics 14 (2023).
date_created: 2023-07-24T10:48:23Z
date_published: 2023-01-24T00:00:00Z
date_updated: 2023-12-13T11:39:32Z
day: '24'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.21468/scipostphys.14.1.006
external_id:
  arxiv:
  - '2204.01606'
  isi:
  - '001000325800008'
file:
- access_level: open_access
  checksum: ffdb70b9ae7aa45ea4ea6096ecbd6431
  content_type: application/pdf
  creator: dernst
  date_created: 2023-07-31T08:44:38Z
  date_updated: 2023-07-31T08:44:38Z
  file_id: '13328'
  file_name: 2023_SciPostPhysics_Rammelmueller.pdf
  file_size: 1163444
  relation: main_file
  success: 1
file_date_updated: 2023-07-31T08:44:38Z
fulldoi: https://doi.org/10.21468/scipostphys.14.1.006
has_accepted_license: '1'
intvolume: '        14'
isi: 1
issue: '1'
keyword:
- General Physics and Astronomy
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
publication: SciPost Physics
publication_identifier:
  issn:
  - 2542-4653
publication_status: published
publisher: SciPost Foundation
quality_controlled: '1'
scopus_import: '1'
status: public
title: Magnetic impurity in a one-dimensional few-fermion system
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 14
year: '2023'
...