Work

Finite temperature dopant-induced spin reorganization explored via tensor networks in the two-dimensional t − J model

Year: 2026

Type: article

Abstract: We study the two-dimensional t − J model at finite temperature directly in the thermodynamic limit using purification represented by an infinite projected entangled-pair state (iPEPS). We reach temperatures down to T / t = 0.1 and hole concentrations up to 1 − n ≃ 0.25 , and provide benchmark thermodynamic-limit results for the specific heat, uniform susceptibility, and charge compressibility. We identify a susceptibility maximum T * that tracks the buildup of short-range antiferromagnetism and a shallow compressibility enhancement upon cooling in the same doping window. To expose the underlying microscopic mechanism, we introduce dopant-conditioned multipoint correlators that quantify how holes reorganize nearby exchange: Single holes weaken adjacent antiferromagnetic bonds, while nearest-neighbor hole pairs produce a cooperative response that reinforces antiferromagnetism on the parallel plaquette edge. Over the same parameter window, d -wave pairing correlations remain short-ranged. These results provide experiment-compatible thermodynamic-limit benchmarks and establish dopant-conditioned correlators as incisive probes of finite-temperature spin-texture reorganization in doped Mott insulators.

Source: Physical review. B./Physical review. B

DOI: 10.1103/6pcg-qq4p

Authors: Yintai Zhang, Aritra Sinha, Marek M. Rams, Jacek Dziarmaga

Institutions: Jagiellonian University, Max Planck Institute for the Physics of Complex Systems

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Alexander von Humboldt-Stiftung, Narodowe Centrum Nauki, Infrastruktura PL-Grid, Academic Computer Centre Cyfronet, AGH University of Science and Technology

Awards: G3321963724, G5816665975, G8399338319