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PreprintCC BY 4.0arXiv

An Energy Integration Free Kubo-Bastin Formula Decomposition

  • Ousmane Ly
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Abstract

Kubo formulae play a central role in modern spintronics and condensed matter physics, serving as the foundational ground for studying transport responses in the linear regime. In this work, we propose a reformulation of the widely used Kubo-Bastin decompositions that eliminates the need for numerical energy integration. By performing these integrations analytically for generic periodic systems, our approach significantly reduces computational cost and simplifies the calculation of transport coefficients, while maintaining a clear distinction between the relevant Fermi-surface and Fermi-sea transport components. Our formulation suggests that the Fermi-surface term can be attributed to a pure intraband contribution. In contrast to widely used energy integration free expressions that are strictly limited to zero temperature, the present formulation remains valid at arbitrary temperatures.

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Cite

BibTeXRIS
BibTeX
@misc{ly2026energy,
  title = {{An Energy Integration Free Kubo-Bastin Formula Decomposition}},
  author = {Ousmane Ly},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2605.19670},
  eprint = {2605.19670},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.19670},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - An Energy Integration Free Kubo-Bastin Formula Decomposition
AU  - Ousmane Ly
PY  - 2026
DA  - 2026/10/01
PB  - arXiv
DO  - 10.48550/arxiv.2605.19670
UR  - https://arxiv.org/abs/2605.19670
AB  - Kubo formulae play a central role in modern spintronics and condensed matter physics, serving as the foundational ground for studying transport responses in the linear regime. In this work, we propose a reformulation of the widely used Kubo-Bastin decompositions that eliminates the need for numerical energy integration. By performing these integrations analytically for generic periodic systems, our approach significantly reduces computational cost and simplifies the calculation of transport coefficients, while maintaining a clear distinction between the relevant Fermi-surface and Fermi-sea transport components. Our formulation suggests that the Fermi-surface term can be attributed to a pure intraband contribution. In contrast to widely used energy integration free expressions that are strictly limited to zero temperature, the present formulation remains valid at arbitrary temperatures.
ER  -