Pith Number

pith:3VBPNAK7

pith:2026:3VBPNAK7YRHTU2KDFEANE2Q3ND

not attested not anchored not stored refs resolved

Nature of point defects in bulk hexagonal diamond

Chen-Min Dai, Chunlan Ma, Guliqinayi Alimu, Ling Zhu, Xuanxuan Zhang, Zenghua Cai

First-principles calculations show carbon vacancies dominate intrinsic conductivity in hexagonal diamond while boron and nitrogen dopants enable p-type and n-type behavior.

arxiv:2604.22393 v2 · 2026-04-24 · cond-mat.mtrl-sci · physics.comp-ph

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\usepackage{pith}
\pithnumber{3VBPNAK7YRHTU2KDFEANE2Q3ND}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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Claims

C1strongest claim

VC dominates intrinsic conductivity, while Ci is unstable. Among extrinsic dopants, boron acts as a benign acceptor enhancing p-type conductivity, whereas nitrogen and phosphorus serve as effective donors for n-type conductivity. VC, MgC and XV defect complexes display multiple spin and charge states within the HD band gap.

C2weakest assumption

The first-principles calculations (likely DFT) accurately predict formation energies, charge states, and stability of defects in HD without major errors from functional choice, supercell size, or lack of experimental benchmarks.

C3one line summary

DFT study finds vacancy defects dominate conductivity in hexagonal diamond, identifies boron as p-type dopant and nitrogen/phosphorus as n-type, and highlights defect complexes as potential color centers.

References

29 extracted · 29 resolved · 0 Pith anchors

[1] S. Lai, X. Yang, J. Shi, S. Liu, Y . Guo, L. Yan, J. Zang, Z. Zhang, Q. Jia, J. Sun, S. Cheng, and C. Shan, Bulk hexagonal diamond, Nature 651, 621-625 (2026) 2026

[2] L. Yang, K. C. Lau, Z. Zeng, D. Zhang, H. Tang, B. Yan, G. Niu, H. Gou, Y . Yang, W. Yang, D. Luo, and H. K. Mao, Synthesis of bulk hexagonal diamond, Nature 644, 370-375 (2025) 2025

[3] L. Qingkun, S. Yi, L. Zhiyuan, and Z. Yu, Lonsdaleite – A material stronger and stiffer than diamond, Scr. Mater. 65, 229-232 (2011) 2011

[4] K. A. Abdelghafar, D. S. Choi, and K. A. Askar, Luminescence lineshapes of nitrogen vacancy center in lonsdaleite and dual structure of diamond/lonsdaleite: a DFT study, Sci. Rep. 15, 15334 (2025) 2025

[5] R. J. Narayan, R. D. Boehm, and A. V . Sumant, Medical applications of diamond particles & surfaces, Mater. Today 14, 154-163 (2011) 2011

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-20T00:00:39.385862Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

dd42f6815fc44f3a69432900d26a1b68df2d9d401c2909879ce029ab29ac200d

Aliases

arxiv: 2604.22393 · arxiv_version: 2604.22393v2 · doi: 10.48550/arxiv.2604.22393 · pith_short_12: 3VBPNAK7YRHT · pith_short_16: 3VBPNAK7YRHTU2KD · pith_short_8: 3VBPNAK7

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/3VBPNAK7YRHTU2KDFEANE2Q3ND \
  | 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: dd42f6815fc44f3a69432900d26a1b68df2d9d401c2909879ce029ab29ac200d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f311dd0ada8b8d813751ea8df5edb01d2ca0c618702f34bbf2b8439bd5e453f1",
    "cross_cats_sorted": [
      "physics.comp-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cond-mat.mtrl-sci",
    "submitted_at": "2026-04-24T09:32:14Z",
    "title_canon_sha256": "fe30658bdc69afb4d41d3204e4f1455058098072ece5bfbb2d550dd08c98fd59"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.22393",
    "kind": "arxiv",
    "version": 2
  }
}