Pith Number

pith:3KXK7BZM

pith:2026:3KXK7BZMQPXGSAM3FJPQHX4TZZ

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Radio-frequency reflectometry in silicon carbide large-area transistors

Alessandro Rossi, Alexander Zotov, Conor McGeough, Megan Powell

Large-area silicon carbide transistors show a gate-dependent RF reflectometry response that degrades and vanishes at low temperatures due to carrier freeze-out in the drift region.

arxiv:2605.15389 v1 · 2026-05-14 · cond-mat.mes-hall · physics.app-ph

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Claims

C1strongest claim

We observe a gate-dependent RF response which degrades and eventually vanishes as temperature is lowered, although MOSFET operation in DC transport is maintained down to deep cryogenic temperatures. We attribute this behaviour to impedance changes introduced by carrier freeze-out in the transistor drift region, and propose a modified circuit configuration designed to restore sensitivity under these conditions.

C2weakest assumption

The assumption that the observed degradation of the RF response is caused specifically by impedance changes from carrier freeze-out in the drift region rather than other temperature-dependent effects such as interface traps or contact resistance; this attribution is stated in the abstract but would require detailed impedance modeling or temperature-dependent measurements to confirm.

C3one line summary

Gate-based RF reflectometry on large-area SiC transistors shows gate-dependent response that degrades at cryogenic temperatures due to carrier freeze-out in the drift region, with a proposed modified circuit to restore sensitivity.

References

39 extracted · 39 resolved · 0 Pith anchors

[1] Our aluminium bond wires have a length ofl≈5 mm and diameter 50µm (r= 25µm), henceL bw ≈5 nH

[2] Substitutingl= 5 mm andr= 25µm givesR bw,dc ≈0.07 Ω

[3] Using a typical PCB trace in- ductance of order 1 nH/mm and measured trace lengths of approximately 10–15 mm yields inductance values re- ported in Table I

[4] Substitution givesC p ≈4 pF

[5] The values are taken atV DS = 0

Formal links

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Receipt and verification

First computed	2026-05-20T00:00:56.030533Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

daaeaf872c83ee69019b2a5f03df93ce64307684457608bf6f7f58077397f0d1

Aliases

arxiv: 2605.15389 · arxiv_version: 2605.15389v1 · doi: 10.48550/arxiv.2605.15389 · pith_short_12: 3KXK7BZMQPXG · pith_short_16: 3KXK7BZMQPXGSAM3 · pith_short_8: 3KXK7BZM

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/3KXK7BZMQPXGSAM3FJPQHX4TZZ \
  | 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: daaeaf872c83ee69019b2a5f03df93ce64307684457608bf6f7f58077397f0d1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b0a6df51d49dc9a0a3f41a08029d189a4565799b1589ccff8c420882aafae22d",
    "cross_cats_sorted": [
      "physics.app-ph"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cond-mat.mes-hall",
    "submitted_at": "2026-05-14T20:18:31Z",
    "title_canon_sha256": "1407c1b8ceaa8569cc093a6b4e32510626e4dce797e9a741be69fa8a51d358dc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.15389",
    "kind": "arxiv",
    "version": 1
  }
}