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P24 Success 6/6 Matière condensée

Effet Hall quantique fractionnaire — suite de Jain

La suite de Jain ν = n/(2pn±1) est dérivée avec ses statistiques, sa couverture des fractions observées, ses gaps, le cas ν = 5/2 et le levier discriminant : 6/6 critères.

◫ Simulation figure(s)

Figure P24

JSON results — converted to tables

Machine-readable artefacts frozen by SHA-256. Each JSON structure is unfolded into tables; the "raw JSON" link points to the source file on GitHub.

p24_jain.json 11 table(s) · 44 rows Raw JSON on GitHub
ChampValeur
chantierP24
titreBorne Hall fractionnaire — suite de Jain derivee (P17+P18)

Explanation — context & formalism

P24 — Fractional Quantum Hall Effect (Jain Sequence)

Field: Condensed Matter Physics Verdict: ✅ Success (6/6)

Problem

Can the Jain sequence ν = n/(2pn ± 1) — and its conjugate 1 − ν — be derived from two ingredients already locked: the flux quantum Φ₀ = h/e (P17) and the integer Chern number σ = Ce²/h (P18)?

Derivation

In the lowest Landau level, the only scale is l_B and dynamics is frozen. Attach 2p flux quanta to each electron. The composite fermion sees reduced field:

B* = B − 2p n Φ₀  →  ν* = ν/(1 − 2pν)

Requiring the integer Chern number from P18 for composite fermions, ν* = n, gives without any new parameter:

ν = n/(2pn ± 1) and its particle-hole conjugate 1 − ν.

Results

Observed fractionJain assignmentIn sequence
1/3, 2/5, 3/7, 4/9, 5/11n/(2n+1), p=1
2/3, 3/5, 4/7, 5/9conjugates 1−ν
1/5, 2/7n/(4n+1), p=2
Coverage11/11

Gap hierarchy along branch n/(2n+1): 1/3 : 0.10 → 2/5 : 0.033 → 3/7 : 0.013 — monotonically decreasing with denominator, as required by B* = B/(2n+1).

Key theorems from the bench

  1. Statistics constrain flux parity: exchanging two particles around q flux quanta adds phase e^(iπq). Preserving fermion statistics requires q even, hence denominator 2pn ± 1 is necessarily odd.
  2. ν = 1/2 is gapless: B* = 0 → composite fermion Fermi sea, no plateau. No even denominator is producible.
  3. Without attachment (p = 0): only integers are derived — no fractions.

Failures (localized)

  1. Gap magnitudes: direction (Δ decreases with q) is derived, but measured slope (~q⁻²·⁴) requires composite fermion mass — a two-body response.
  2. ν = 5/2 plateau: observed, but has even denominator — outside the mechanism, requires composite fermion pairing.

Verdict

CriterionResult
Statistics ⇒ q even
Jain sequence derived, no parameter
Coverage 11/11 observed
Gap hierarchy direction
ν = 1/2 gapless discriminant
Lever without attachment negative

Document chain

Document source

Reports (PDF verdict notes)

</> Simulation — Python scripts

p24_jain.py

⌗ Cross-references

§ Related glossary entries

Levier discriminant — Invariant n°2 : chaque mécanisme candidat doit survivre à sa propre suppression — on retire le mécanisme, le résultat doit s'effondrer. Note P_c dans les verdicts.
Suite de Jain — ν = n/(2pn ± 1) : fractions de l'effet Hall quantique fractionnaire via fermions composites ; 6/6 critères dérivés.

See the full glossary →