---
_id: '5886'
abstract:
- lang: eng
  text: Problems involving quantum impurities, in which one or a few particles are
    interacting with a macroscopic environment, represent a pervasive paradigm, spanning
    across atomic, molecular, and condensed-matter physics. In this paper we introduce
    new variational approaches to quantum impurities and apply them to the Fröhlich
    polaron–a quasiparticle formed out of an electron (or other point-like impurity)
    in a polar medium, and to the angulon–a quasiparticle formed out of a rotating
    molecule in a bosonic bath. We benchmark these approaches against established
    theories, evaluating their accuracy as a function of the impurity-bath coupling.
article_processing_charge: No
author:
- first_name: Xiang
  full_name: Li, Xiang
  id: 4B7E523C-F248-11E8-B48F-1D18A9856A87
  last_name: Li
- first_name: Giacomo
  full_name: Bighin, Giacomo
  id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
  last_name: Bighin
  orcid: 0000-0001-8823-9777
- first_name: Enderalp
  full_name: Yakaboylu, Enderalp
  id: 38CB71F6-F248-11E8-B48F-1D18A9856A87
  last_name: Yakaboylu
  orcid: 0000-0001-5973-0874
- first_name: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
citation:
  ama: 'Li X, Bighin G, Yakaboylu E, Lemeshko M. Variational approaches to quantum
    impurities: from the Fröhlich polaron to the angulon. <i>Molecular Physics</i>.
    2019. doi:<a href="https://doi.org/10.1080/00268976.2019.1567852">10.1080/00268976.2019.1567852</a>'
  apa: 'Li, X., Bighin, G., Yakaboylu, E., &#38; Lemeshko, M. (2019). Variational
    approaches to quantum impurities: from the Fröhlich polaron to the angulon. <i>Molecular
    Physics</i>. Taylor and Francis. <a href="https://doi.org/10.1080/00268976.2019.1567852">https://doi.org/10.1080/00268976.2019.1567852</a>'
  chicago: 'Li, Xiang, Giacomo Bighin, Enderalp Yakaboylu, and Mikhail Lemeshko. “Variational
    Approaches to Quantum Impurities: From the Fröhlich Polaron to the Angulon.” <i>Molecular
    Physics</i>. Taylor and Francis, 2019. <a href="https://doi.org/10.1080/00268976.2019.1567852">https://doi.org/10.1080/00268976.2019.1567852</a>.'
  ieee: 'X. Li, G. Bighin, E. Yakaboylu, and M. Lemeshko, “Variational approaches
    to quantum impurities: from the Fröhlich polaron to the angulon,” <i>Molecular
    Physics</i>. Taylor and Francis, 2019.'
  ista: 'Li X, Bighin G, Yakaboylu E, Lemeshko M. 2019. Variational approaches to
    quantum impurities: from the Fröhlich polaron to the angulon. Molecular Physics.'
  mla: 'Li, Xiang, et al. “Variational Approaches to Quantum Impurities: From the
    Fröhlich Polaron to the Angulon.” <i>Molecular Physics</i>, Taylor and Francis,
    2019, doi:<a href="https://doi.org/10.1080/00268976.2019.1567852">10.1080/00268976.2019.1567852</a>.'
  short: X. Li, G. Bighin, E. Yakaboylu, M. Lemeshko, Molecular Physics (2019).
date_created: 2019-01-27T22:59:10Z
date_published: 2019-01-18T00:00:00Z
date_updated: 2023-09-07T13:16:42Z
day: '18'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1080/00268976.2019.1567852
ec_funded: 1
external_id:
  isi:
  - '000474641400008'
file:
- access_level: open_access
  checksum: 178964744b636a6f036372f4f090a657
  content_type: application/pdf
  creator: dernst
  date_created: 2019-01-29T08:32:57Z
  date_updated: 2020-07-14T12:47:13Z
  file_id: '5896'
  file_name: 2019_MolecularPhysics_Li.pdf
  file_size: 1309966
  relation: main_file
file_date_updated: 2020-07-14T12:47:13Z
has_accepted_license: '1'
isi: 1
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
month: '01'
oa: 1
oa_version: Published Version
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: P29902
  name: Quantum rotations in the presence of a many-body environment
- _id: 25681D80-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '291734'
  name: International IST Postdoc Fellowship Programme
publication: Molecular Physics
publication_identifier:
  issn:
  - '00268976'
publication_status: published
publisher: Taylor and Francis
quality_controlled: '1'
related_material:
  record:
  - id: '8958'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: 'Variational approaches to quantum impurities: from the Fröhlich polaron to
  the angulon'
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: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
year: '2019'
...