Pith Number

pith:XNL4V4Q5

pith:2025:XNL4V4Q5GIG2E2SDGKZFBVW72Z

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Ultrafast Stiffening of the Lattice Potential and Metastable State Formation in 1$T$-TiSe$_2$

Bo Chen, Chen Zhang, Chuan-Cun Shu, Hai-Yun Liu, Hao Liu, Jian-Qiao Meng, Peter M. Oppeneer, Qi-Yi Wu, Xiao-Fang Tang, Xue-Qing Ye, Yu-Xia Duan

The CDW amplitude mode in 1T-TiSe2 hardens with increasing pump fluence, revealing ultrafast restoration of the bare lattice potential through carrier screening.

arxiv:2512.02595 v2 · 2025-12-02 · cond-mat.str-el

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Claims

C1strongest claim

The CDW amplitude mode exhibits anomalous hardening (frequency upshift) with increasing pump fluence. We establish this hardening as the direct signature of an ultrafast restoration of the bare lattice potential.

C2weakest assumption

That the observed frequency upshift of the CDW amplitude mode is caused primarily by screening of long-range electron-phonon interactions by the photoexcited carrier plasma rather than by transient heating, nonlinear phonon interactions, or changes in the electronic structure that are not directly measured.

C3one line summary

In 1T-TiSe2, increasing pump fluence hardens the CDW amplitude phonon mode as a signature of ultrafast bare lattice potential restoration via carrier screening, while crossing a critical fluence triggers a photoinduced metastable metallic state.

References

52 extracted · 52 resolved · 0 Pith anchors

[1] H. Noh, J. Jeong, E. Cho, K. Kim, B. I. Min, and B. Park, Ex- perimental Realization of Type-II Dirac Fermions in a PdTe 2 Superconductor, Phys. Rev. Lett.119, 016401 (2017) 2017

[2] S. Manzeli, D. Ovchinnikov, D. Pasquier, O. V . Yazyev, and A. Kis, 2D transition metal dichalcogenides, Nat. Rev. Mater.2, 17033 (2017) 2017

[3] A. Jindal, A. Saha, Z. Li, T. Taniguchi, K. Watanabe, J.C. Hone, T. Birol, R. M. Fernandes, C. R. Dean, A. N. Pasupathy, and D. A. Rhodes, Coupled ferroelectricity and superconductivity in bilayerT d- 2023

[4] K. Rossnagel, On the origin of charge-density waves in select layered transition-metal dichalcogenides, J. Phys.: Condens. Matter23, 213001 (2011) 2011

[5] J. Hwang, W. Ruan, Y . Chen, S. Tang, M. F. Crommie, Z. Shen, and S. Mo, Charge density waves in two-dimensional transition metal dichalcogenides, Rep. Prog. Phys.87, 044502 (2024) 2024

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Receipt and verification

First computed	2026-06-02T01:03:38.990714Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bb57caf21d320da26a4332b250d6dfd67600a1a6c7588c75a82d82a2bec00d1b

Aliases

arxiv: 2512.02595 · arxiv_version: 2512.02595v2 · doi: 10.48550/arxiv.2512.02595 · pith_short_12: XNL4V4Q5GIG2 · pith_short_16: XNL4V4Q5GIG2E2SD · pith_short_8: XNL4V4Q5

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/XNL4V4Q5GIG2E2SDGKZFBVW72Z \
  | 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: bb57caf21d320da26a4332b250d6dfd67600a1a6c7588c75a82d82a2bec00d1b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c52e294af0b418822bcc7921fb64b07ae56c86c23757668d838fa0c32aebfdd1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cond-mat.str-el",
    "submitted_at": "2025-12-02T10:02:41Z",
    "title_canon_sha256": "0278e4fd655cd2ca7177353ba0c6731a50318bd59d05c6ad08ca4f7f083076f3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2512.02595",
    "kind": "arxiv",
    "version": 2
  }
}