# Optical conductivity and band gap in the double-Weyl candidate <math>  <msub>    <mi>SrSi</mi>    <mn>2</mn>  </msub></math> at ambient pressure

https://mdr.nims.go.jp/datasets/66c57531-bb33-498f-ae83-f52977b0b8a2

## Files

- [SrSi2.pdf](https://mdr.nims.go.jp/filesets/13feb1af-2384-49d8-be0d-849dfe97c414/download) ([Detail](https://mdr.nims.go.jp/filesets/13feb1af-2384-49d8-be0d-849dfe97c414.md))

## Id

66c57531-bb33-498f-ae83-f52977b0b8a2

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-10-21T04:26:23.441077Z

## Updated at

2025-10-23T23:30:08.598737Z

## Published at

2025-10-23T23:18:41.073791Z

## Doi

https://doi.org/10.48505/nims.5822

## First published url

https://doi.org/10.1103/y1gj-67wz

## Date published

2025-10-20

## Recorded date published

2025-10

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: "Optical conductivity and band gap in the double-Weyl candidate \n<mml:math
    xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:msub><mml:mi>SrSi</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>\n
    at ambient pressure"
  title_type: original
  lang: en

## Description

- description: We probe the possible double-Weyl state in cubic SrSi2 using optical
    spectroscopy. The complex optical conductivity was measured in a frequency range
    from 70 cm−1 to 22 000 cm−1 at temperatures down to 10 K at ambient pressure.
    The optical response of SrSi2 can be well separated into the intraband (free carriers)
    and interband contributions. Additionally, four infrared-active phonons are detected.
    As follows from the optical spectra, the free-carrier density decreases with decreasing
    temperature, consistent with an activation behaviour. Experimental interband conductivity
    juxtaposed with ab initio calculations shows that conventional density-functional
    theory fails to describe the electronic structure of SrSi2 in the vicinity of
    the Fermi level. A semi-local exchange-correlation potential allows a much better
    agreement with the experiment, resulting in the trivial (gapped) band structure
    of SrSi2. The direct gap estimated from the measurements is approximately 40 meV.
  description_type: abstract
  lang: und

## Creator

- name: L. Z. Maulana
  role: author
  orcid: https://orcid.org/0000-0003-3320-0298
- name: A. A. Tsirlin
  role: author
  orcid: https://orcid.org/0000-0001-6916-8256
- name: E. Uykur
  role: author
  orcid: https://orcid.org/0000-0001-7253-4579
- name: Y. Saito
  role: author
  orcid: https://orcid.org/0000-0003-2844-7245
- name: M. Dressel
  role: author
  orcid: https://orcid.org/0000-0003-1907-052X
- name: M. Imai
  role: author
  orcid: https://orcid.org/0000-0002-5848-113X
- name: A. V. Pronin
  role: author
  orcid: https://orcid.org/0000-0003-2585-7476

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: silicide
  schema: not_defined
- subject: semiconductor
  schema: not_defined
- subject: optical conductivity
  schema: not_defined

## Rights

- description: "©2025 American Physical Society"
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Physical Review B
  issn: '24699950'
  volume: '112'
  issue: '15'
  article_number: '155209'

## Conference



## Related item



## Funding

- identifier: DR228/51-3
  funder_name: Deutsche Forschungsgemeinschaft
- identifier: JP22H00268
  funder_name: Japan Society for the Promotion of Science

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



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## Fileset

- id: 13feb1af-2384-49d8-be0d-849dfe97c414
  filename: SrSi2.pdf
  content_type: application/pdf
  size: 5287347
  md5: fc087fbc4e51c21545423154938036d0

## Thumbnail

fileset_id: 13feb1af-2384-49d8-be0d-849dfe97c414
filename: SrSi2.pdf