Optical spatial dispersion via Wannier interpolation
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866908325492293632 |
|---|---|
| author | Urru, Andrea Souza, Ivo Ocaña, Óscar Pozo Tsirkin, Stepan S. Vanderbilt, David |
| author_facet | Urru, Andrea Souza, Ivo Ocaña, Óscar Pozo Tsirkin, Stepan S. Vanderbilt, David |
| contents | We present a numerical implementation, based on Wannier interpolation, of a Kubo-Greenwood formalism for computing the spatially dispersive optical conductivity in crystals at first order in the wave vector of light. This approach is more efficient than direct $\textit{ab initio}$ methods because, with less computational cost, it allows for a much finer sampling of reciprocal space, resulting in better resolved spectra. Moreover, Wannier interpolation avoids errors arising from truncation of the sums over conduction bands when evaluating the spatially dispersive optical matrix elements. We validate our method by computing the optical activity spectrum of selected crystals, both polar (GaN) and chiral (trigonal Te, trigonal Se, and $α$-quartz), and comparing with existing literature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_09742 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optical spatial dispersion via Wannier interpolation Urru, Andrea Souza, Ivo Ocaña, Óscar Pozo Tsirkin, Stepan S. Vanderbilt, David Materials Science We present a numerical implementation, based on Wannier interpolation, of a Kubo-Greenwood formalism for computing the spatially dispersive optical conductivity in crystals at first order in the wave vector of light. This approach is more efficient than direct $\textit{ab initio}$ methods because, with less computational cost, it allows for a much finer sampling of reciprocal space, resulting in better resolved spectra. Moreover, Wannier interpolation avoids errors arising from truncation of the sums over conduction bands when evaluating the spatially dispersive optical matrix elements. We validate our method by computing the optical activity spectrum of selected crystals, both polar (GaN) and chiral (trigonal Te, trigonal Se, and $α$-quartz), and comparing with existing literature. |
| title | Optical spatial dispersion via Wannier interpolation |
| topic | Materials Science |
| url | https://arxiv.org/abs/2504.09742 |