Pith Number

pith:JLOFVP66

pith:2026:JLOFVP66UFWMCENRZHDXJOJ733

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Ultrafast Critical Slowing of Spin Dynamics and Emergent Nonequilibrium Fano Interference in Fe3GeTe2

Anamitra Mukherjee, Anupama Chauhan, Mintu Mondal, N. Kamaraju, Satyabrata Bera, Siddhartha Lal, Sidhanta Sahu, Tuhin Debnath

In Fe3GeTe2, time-resolved reflectivity shows spin relaxation slowing critically near the Curie temperature with an exponent near 0.3, while an A1g phonon Fano asymmetry emerges and grows in the paramagnetic phase.

arxiv:2605.13121 v1 · 2026-05-13 · cond-mat.mtrl-sci

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Claims

C1strongest claim

The slowest component displays pronounced critical slowing down with an exponent of ~ 0.3, revealing non-universal relaxation dynamics associated with intralayer spin correlations. Furthermore, we observe an emergent nonequilibrium A1g phonon Fano asymmetry that is suppressed in the ferromagnetic phase but anomalously enhanced in the paramagnetic regime, driven by thermally activated anharmonic decay pathways that bridge the kinematic gap to a hot electronic continuum.

C2weakest assumption

The intermediate relaxation anomaly near Tc is attributed to enhanced interlayer spin-lattice interactions and the Fano asymmetry enhancement is driven specifically by thermally activated anharmonic decay pathways bridging to the electronic continuum; these mechanistic assignments rest on the tri-exponential decomposition and temperature-dependent amplitude trends without direct verification of the decay channels.

C3one line summary

Pump-probe reflectivity on Fe3GeTe2 reveals critical slowing of spin dynamics with exponent ~0.3 and an emergent nonequilibrium A1g phonon Fano asymmetry enhanced in the paramagnetic phase due to anharmonic decay.

References

67 extracted · 67 resolved · 0 Pith anchors

[1] Z. Fei, B. Huang, P . Malinowski, W. Wang, T. Song, J. Sanchez, W. Y ao, D. Xiao, X. Zhu, A. F. May, et al., Two-dimensional itinerant ferromagnetism in atomically thin Fe 3GeTe2, Nat. Mater. 17, 778 2018

[2] B. Liu, S. Liu, L. Y ang, Z. Chen, E. Zhang, Z. Li, J. Wu, X. Ruan, F. Xiu, W. Liu, et al., Light-tunable ferromagnetism in atomically thin Fe 3GeTe2 driven by femtosecond laser pulse, Phys. Rev. Lett 2020

[4] R. Roemer, C. Liu, and K. Zou, Robust ferromagnetism in wafer-scale monolayer and multilayer Fe3GeTe2, npj 2D Mater. Appl. 4, 33 (2020) 2020

[5] Y . Wu, S. Zhang, J. Zhang, W. Wang, Y . L. Zhu, J. Hu, G. Yin, K. Wong, C. Fang, C. Wan, et al., Néel- type skyrmion in WTe2/Fe3GeTe2 van der Waals heterostructure, Nat. Commun. 11, 3860 (2020) 2020

[6] M. T. Birch, L. Powalla, S. Wintz, O. Hovorka, K. Litzius, J. C. Loudon, L. A. Turnbull, V . Nehruji, 12 K. Son, C. Bubeck, et al., History-dependent domain and skyrmion formation in 2D van der Waals 2022

Receipt and verification

First computed	2026-05-18T03:08:57.980660Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4adc5abfdea16cc111b1c9c774b93fdeece4ec334dbe95c4f6b362247846d190

Aliases

arxiv: 2605.13121 · arxiv_version: 2605.13121v1 · doi: 10.48550/arxiv.2605.13121 · pith_short_12: JLOFVP66UFWM · pith_short_16: JLOFVP66UFWMCENR · pith_short_8: JLOFVP66

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/JLOFVP66UFWMCENRZHDXJOJ733 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 4adc5abfdea16cc111b1c9c774b93fdeece4ec334dbe95c4f6b362247846d190

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "66cdfb72efeab4d88d888ce6de58467f46fec7130c710d4a7cde986d4fc0d925",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cond-mat.mtrl-sci",
    "submitted_at": "2026-05-13T07:47:50Z",
    "title_canon_sha256": "b0016811ba814543ee990708a16255ee8a8623db8fcc47f1ce3e6edacd70e3e3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13121",
    "kind": "arxiv",
    "version": 1
  }
}