Pith Number

pith:OHK27WHH

pith:2026:OHK27WHH6ZB3ZZNQ2DQA7EEYYR

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Collective amplification and anisotropic narrowing of alignment signals in cesium vapor under strong spin exchange near zero magnetic field

Anton K. Vershovskii, Mikhail V. Petrenko

Ultra-narrow alignment resonances in cesium vapor arise predominantly from quadrupole anisotropy due to spontaneous transverse orientation under strong spin exchange.

arxiv:2605.13466 v1 · 2026-05-13 · quant-ph · physics.atom-ph · physics.optics

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Claims

C1strongest claim

The experimentally observed ultra-narrow alignment resonances may originate predominantly from quadrupole anisotropy associated with spontaneous transverse orientation projected onto the detection axis.

C2weakest assumption

That the spontaneous polarization effects arising under strong spin exchange are sufficient to produce the observed anisotropy, bistability, and memory without requiring additional fitted parameters or post-hoc adjustments to the model.

C3one line summary

Cesium vapor under strong spin exchange shows direction-dependent ultra-narrow Hanle resonances whose widths switch between classical spin-exchange and SERF regimes, accompanied by concentration-driven bistability and long-term memory that a qualitative model traces to spontaneous quadrupole order.

References

42 extracted · 42 resolved · 0 Pith anchors

[1] In processing these, we relied on the theory of [25], which fully and reliably describes the alignment signals in the classical case. The upper rows of Figs. 2, 3 show the maps obtained by scanning th

[2] Linearly polarized pumping (E∥x) emptiesF= 3 manifold and creates negative alignment along the xaxis in theF= 4manifold, and therefore positive alignment in the transverse0yzplane

[3] Under strong SE conditions, this transverse anisotropy serves as a seed for spontaneous polar- ization (SP) inside local spin-exchange domains

[4] A pos- sible reason is the ellipticity introduced into the beam by the rotating alignment components

[5] The spontaneous orientation initially appears as the componentP z, while the experimentally rel- evant componentP y is subsequently generated through ordinary Larmor precession in the fieldBx

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-18T02:44:41.633431Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

71d5afd8e7f643bce5b0d0e00f9098c47752260caa4a5763266beb915b58129b

Aliases

arxiv: 2605.13466 · arxiv_version: 2605.13466v1 · doi: 10.48550/arxiv.2605.13466 · pith_short_12: OHK27WHH6ZB3 · pith_short_16: OHK27WHH6ZB3ZZNQ · pith_short_8: OHK27WHH

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/OHK27WHH6ZB3ZZNQ2DQA7EEYYR \
  | 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: 71d5afd8e7f643bce5b0d0e00f9098c47752260caa4a5763266beb915b58129b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0affcd50ec3f9b20ca3ad7b1092c83c0f8c26b788c70f1dfc63cae50b5596ae0",
    "cross_cats_sorted": [
      "physics.atom-ph",
      "physics.optics"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2026-05-13T12:55:13Z",
    "title_canon_sha256": "814650e85783965b15e9ab80fc4a2d3109b30a190236df0c7102604c423194e8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13466",
    "kind": "arxiv",
    "version": 1
  }
}