PreprintCC BY 4.0arXiv
Exact solutions for kinematics across interaction-deformed Fermi surfaces
Abstract
Luttinger's theorem fixes the volume of the Fermi sea of a Fermi liquid, but not how interactions redistribute occupation around its surface. For an interaction switched on and tuned at fixed density, we derive the exact rates of change of the occupation deficit inside the interacting Fermi surface and of the surplus outside it. Each is the weight swept by the deforming surface plus a change of Luttinger's integrand at fixed momentum; the difference of the surface terms is flux of incoherent weight 1 − Zk⃗. These identities hold with or without the Luttinger theorem.
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BibTeX
@misc{kruchkov2026exact,
title = {{Exact solutions for kinematics across interaction-deformed Fermi surfaces}},
author = {Alexander Kruchkov and F. Duncan M. Haldane},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.08921},
eprint = {2610.08921},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.08921},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Exact solutions for kinematics across interaction-deformed Fermi surfaces
AU - Alexander Kruchkov
AU - F. Duncan M. Haldane
PY - 2026
DA - 2026/10/06
PB - arXiv
DO - 10.48550/arxiv.2610.08921
UR - https://arxiv.org/abs/2610.08921
AB - Luttinger's theorem fixes the volume of the Fermi sea of a Fermi liquid, but not how interactions redistribute occupation around its surface. For an interaction switched on and tuned at fixed density, we derive the exact rates of change of the occupation deficit inside the interacting Fermi surface and of the surplus outside it. Each is the weight swept by the deforming surface plus a change of Luttinger's integrand at fixed momentum; the difference of the surface terms is flux of incoherent weight 1 − Z_k⃗. These identities hold with or without the Luttinger theorem.
ER -