# Optical properties of orthorhombic germanium sulfide: unveiling the anisotropic nature of Wannier excitons

https://mdr.nims.go.jp/datasets/9e8bb37a-b367-49be-a56f-cd8bc5e1099c

## File

- [d3nr03168c.pdf](https://mdr.nims.go.jp/filesets/034402fa-cbb3-4f3c-b62c-1c53dc3f14e1/download) ([Detail](https://mdr.nims.go.jp/filesets/034402fa-cbb3-4f3c-b62c-1c53dc3f14e1.md))

## Id

9e8bb37a-b367-49be-a56f-cd8bc5e1099c

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-14T06:48:03.710449Z

## Updated at

2025-02-15T03:30:30.011511Z

## Published at

2025-02-15T03:30:30.128245Z

## Doi



## First published url

https://doi.org/10.1039/d3nr03168c

## Date published

2023-10-16

## Recorded date published

2023-11-2

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: 'Optical properties of orthorhombic germanium sulfide: unveiling the anisotropic
    nature of Wannier excitons'
  title_type: original
  lang: en

## Description

- description: We present an experimental and systematic theoretical study of the
    optical proper- ties of anisotropic excitons in GeS encapsulated in hexagonal
    BN with the aid of a com- prehensive approach that combines polarization-resolved
    and temperature-dependent photoluminescence (PL) measurements, ab initio calculations,
    and effective mass ap- proximation (EMA). Our results demonstrate that the Coulomb
    interaction included by the Bethe-Salpeter Equation (BSE) method significantly
    impacts and modifies the optical absorption spectra in GeS, highlighting the crucial
    role of excitonic effects on optical properties. Moreover, we show that the imaginary
    part of the dielectric function exhibits a significant dependence on the direction
    of polarization. By combining ab initio calculations with the EMA, we are able
    to study the quasi-hydrogenic exciton states, oscillator strength, and PL spectroscopy
    of GeS along both the zigzag and armchair axes. We demonstrate that, unlike the
    isotropic hydrogenic model, the perturbation induced by anisotropy reduces the
    symmetry of the system, resulting in the lift of degeneracy and a mixture of exciton
    states. Our theoretical modeling demon- strates a strong correlation with our
    experimental results, providing validation of our approach.
  description_type: abstract
  lang: und

## Creator

- name: Mehdi Arfaoui
  role: author
- name: Natalia Zawadzka
  role: author
- name: Sabrine Ayari
  role: author
- name: Zhaolong Chen
  role: author
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Adam Babiński
  role: author
- name: Maciej Koperski
  role: author
- name: Sihem Jaziri
  role: author
- name: Maciej R. Molas
  role: author

## Contact agent



## Publisher

organization: Royal Society of Chemistry (RSC)

## Managing organization



## Keyword

- subject: Anisotropic excitons
  schema: not_defined
- subject: GeS
  schema: not_defined
- subject: optical properties
  schema: not_defined

## Rights

- identifier: cc-by-3.0

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Nanoscale
  issn: '20403372'
  volume: '15'
  issue: '42'
  start_page: 17014
  end_page: 17028

## Conference



## Related item



## Funding

- identifier: 2017/27/B/ST3/00205
  funder_name: Narodowym Centrum Nauki
- identifier: 2018/31/B/ST3/02111
  funder_name: Narodowym Centrum Nauki
- identifier: C-33-18-279-V12
  funder_name: Ministry of Education - Singapore
- identifier: MOE-T2EP50122-0012
  funder_name: Ministry of Education - Singapore
- identifier: FA8655-21-1-7026
  funder_name: Air Force Office of Scientific Research
- identifier: 20H00354
  funder_name: Japan Society for the Promotion of Science
- identifier: 23H02052
  funder_name: Japan Society for the Promotion of Science
- funder_name: Ministry of Education, Culture, Sports, Science and Technology

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## Fileset

- id: 034402fa-cbb3-4f3c-b62c-1c53dc3f14e1
  filename: d3nr03168c.pdf
  content_type: application/pdf
  size: 4206469
  md5: be06bd489f8f5c14605f6273d059b176

## Thumbnail

fileset_id: 034402fa-cbb3-4f3c-b62c-1c53dc3f14e1
filename: d3nr03168c.pdf