Pith Number

pith:LEZ2GYAM

pith:2026:LEZ2GYAMN3TNIFPBJI54YFAJX5

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Observation of a Mott quantum spin Hall insulator in twisted WSe2

Aoqian Zhang, Ivana Wong, Kaifei Kang, Kenji Watanabe, Nan Zhang, Ning Wang, Takashi Taniguchi, Tze Kin Cheung, Ulf Lampe, Yaqi Ma, Yifei Jin

A magnetic-field-stabilized Mott insulator at half filling in twisted WSe2 carries quantum spin Hall edge transport with the same number of helical channels as a conventional topological insulator.

arxiv:2605.17335 v1 · 2026-05-17 · cond-mat.mes-hall

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The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

We report the observation of QSH edge transport in a magnetic-field-stabilized Mott insulating state at half filling of the second moire band in a 2.29 degree twisted WSe2 device. This state exhibits a resistance plateau identical to that of the single-particle QSH state at full filling of the first moire valence band, indicating the same number of helical edge channels.

C2weakest assumption

The assumption that the observed resistance plateau, nonlocal transport, and negative magnetoconductance unambiguously demonstrate helical edge conduction rather than bulk leakage, contact effects, or other non-topological mechanisms in the half-filled Mott state. This interpretive step appears in the abstract's description of the transport data.

C3one line summary

Reports helical edge transport with nearly quantized resistance in a magnetic-field-stabilized Mott insulating state at half filling of the second moire band in twisted WSe2.

References

2 extracted · 2 resolved · 0 Pith anchors

[1] Foutty, B.A. et al. Mapping twist-tuned multiband topology in bilayer WSe. Science 384, 343–347 (2024). 20. Kang, K.F. et al. Evidence of the fractional quantum spin Hall effect in moiré MoTe2. Nature 2024

[2] ". We found that 𝑅#$ is suppressed to below 3% of 𝑅 2024

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-05-20T00:03:52.773074Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5933a3600c6ee6d415e14a3bcc1409bf683263fa590dae14069031f058e46953

Aliases

arxiv: 2605.17335 · arxiv_version: 2605.17335v1 · doi: 10.48550/arxiv.2605.17335 · pith_short_12: LEZ2GYAMN3TN · pith_short_16: LEZ2GYAMN3TNIFPB · pith_short_8: LEZ2GYAM

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/LEZ2GYAMN3TNIFPBJI54YFAJX5 \
  | 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: 5933a3600c6ee6d415e14a3bcc1409bf683263fa590dae14069031f058e46953

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c4a9b1ef2815e4baf67094321cb6e1aea386f8147aa9ed239a7efb139467d179",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cond-mat.mes-hall",
    "submitted_at": "2026-05-17T09:04:28Z",
    "title_canon_sha256": "a12eecb0324a126f31875fcc1738a4eba2803dfec6166e676d4078ebe491accd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.17335",
    "kind": "arxiv",
    "version": 1
  }
}