{"paper":{"title":"Nonlinear Static Screening of Positive Charges in an Electron Gas: Contact Hartree Energy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.other","authors_text":"A. X. Chen, G. Rodway-Gant, M. Sherafati","submitted_at":"2026-06-22T09:13:59Z","abstract_excerpt":"Electron screening of positive charges in metals is most strongly nonlinear in the static near-field regime. We revisit screening of a static single protonic charge in a homogeneous electron gas, focusing on the induced density and the contact Hartree energy $U_{\\text{H}}(0)$. Although evaluated at the impurity position, $U_{\\text{H}}(0)$ is not purely local: our formulation makes it explicit as a nonlocal quantity set by a radial moment of the full induced density, applicable to both linear-response and nonlinear density-functional-theory (DFT) descriptions. We compare Thomas--Fermi, Lindhard"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.23065","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.23065/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}