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Magnetic polarons at finite temperature: One-hole spectroscopy study

Toni Guthardt1, Markus Scheb1, Jan von Delft1,2, Annabelle Bohrdt1,2,3, and Fabian Grusdt1,2

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Phys. Rev. B 112, 205117 – Published 14 November, 2025

DOI: https://doi.org/10.1103/4588-hpc2

Abstract

The physics of strongly correlated fermions described by Hubbard or t−J models in the underdoped regime—relevant for high-temperature superconductivity in cuprate compounds—remains a subject of ongoing debate. In particular, the nature of charge carriers in this regime is poorly understood, in part due to the unusual properties of their spectral function. In this Letter, we present unbiased numerical results for the one-hole spectral function in a t−J model at finite temperatures. Our study provides valuable insights into the underlying physics of magnetic (or spin-) polaron formation in a doped antiferromagnet (AFM). For example, we find how the suppression of spectral weight outside the magnetic Brillouin zone—a precursor of Fermi arc formation–disappears with increasing temperature, revealing nearly-deconfined spinon excitations of the undoped AFM. The pristine setting we consider can be directly explored using quantum simulators. Our calculations demonstrate that coherent quasiparticle peaks associated with magnetic polarons can be observed up to temperatures T>J above the spin-exchange J, routinely obtained in such experiments. This paves the way for future studies of the fate of magnetic polarons in the pseudogap phase.

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Finite-temperature real-time properties of magnetic polarons in two-dimensional quantum antiferromagnets

Toni Guthardt, Markus Scheb, Jan von Delft, Fabian Grusdt, and Annabelle Bohrdt
Phys. Rev. B 112, 205118 (2025)

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Phys. Rev. B 112, 205117– Published 14 November, 2025
  • Received 14 April 2025
  • Revised 24 September 2025
  • Accepted 7 October 2025
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