---
_id: '46'
abstract:
- lang: eng
text: We analyze a disordered central spin model, where a central spin interacts
equally with each spin in a periodic one-dimensional (1D) random-field Heisenberg
chain. If the Heisenberg chain is initially in the many-body localized (MBL) phase,
we find that the coupling to the central spin suffices to delocalize the chain
for a substantial range of coupling strengths. We calculate the phase diagram
of the model and identify the phase boundary between the MBL and ergodic phase.
Within the localized phase, the central spin significantly enhances the rate of
the logarithmic entanglement growth and its saturation value. We attribute the
increase in entanglement entropy to a nonextensive enhancement of magnetization
fluctuations induced by the central spin. Finally, we demonstrate that correlation
functions of the central spin can be utilized to distinguish between MBL and ergodic
phases of the 1D chain. Hence, we propose the use of a central spin as a possible
experimental probe to identify the MBL phase.
acknowledgement: F.P. acknowledges the sup- port of the DFG Research Unit FOR 1807
through Grants No. PO 1370/2-1 and No. TRR80, the Nanosystems Initiative Munich
(NIM) by the German Excellence Initiative, and the European Research Council (ERC)
under the European Union’s Horizon 2020 research and innovation programme (Grant
Agreement No. 771537). N.Y.Y. acknowledges support from the NSF (PHY-1654740), the
ARO STIR program, and a Google research award.
article_number: '161122'
article_processing_charge: No
article_type: original
author:
- first_name: Daniel
full_name: Hetterich, Daniel
last_name: Hetterich
- first_name: Norman
full_name: Yao, Norman
last_name: Yao
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
- first_name: Frank
full_name: Pollmann, Frank
last_name: Pollmann
- first_name: Björn
full_name: Trauzettel, Björn
last_name: Trauzettel
citation:
ama: Hetterich D, Yao N, Serbyn M, Pollmann F, Trauzettel B. Detection and characterization
of many-body localization in central spin models. Physical Review B. 2018;98(16).
doi:10.1103/PhysRevB.98.161122
apa: Hetterich, D., Yao, N., Serbyn, M., Pollmann, F., & Trauzettel, B. (2018).
Detection and characterization of many-body localization in central spin models.
Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.98.161122
chicago: Hetterich, Daniel, Norman Yao, Maksym Serbyn, Frank Pollmann, and Björn
Trauzettel. “Detection and Characterization of Many-Body Localization in Central
Spin Models.” Physical Review B. American Physical Society, 2018. https://doi.org/10.1103/PhysRevB.98.161122.
ieee: D. Hetterich, N. Yao, M. Serbyn, F. Pollmann, and B. Trauzettel, “Detection
and characterization of many-body localization in central spin models,” Physical
Review B, vol. 98, no. 16. American Physical Society, 2018.
ista: Hetterich D, Yao N, Serbyn M, Pollmann F, Trauzettel B. 2018. Detection and
characterization of many-body localization in central spin models. Physical Review
B. 98(16), 161122.
mla: Hetterich, Daniel, et al. “Detection and Characterization of Many-Body Localization
in Central Spin Models.” Physical Review B, vol. 98, no. 16, 161122, American
Physical Society, 2018, doi:10.1103/PhysRevB.98.161122.
short: D. Hetterich, N. Yao, M. Serbyn, F. Pollmann, B. Trauzettel, Physical Review
B 98 (2018).
date_created: 2018-12-11T11:44:20Z
date_published: 2018-10-15T00:00:00Z
date_updated: 2023-09-11T12:55:03Z
day: '15'
department:
- _id: MaSe
doi: 10.1103/PhysRevB.98.161122
external_id:
arxiv:
- '1806.08316'
isi:
- '000448596500002'
intvolume: ' 98'
isi: 1
issue: '16'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1806.08316
month: '10'
oa: 1
oa_version: Preprint
publication: Physical Review B
publication_status: published
publisher: American Physical Society
publist_id: '8008'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Detection and characterization of many-body localization in central spin models
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 98
year: '2018'
...