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arxiv: 2507.00128 · v3 · submitted 2025-06-30 · ❄️ cond-mat.mes-hall

Majorana zero modes in semiconductor-superconductor hybrid structures: Defining topology in short and disordered nanowires through Majorana splitting

Pith reviewed 2026-05-19 06:27 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall
keywords Majorana zero modestopological superconductivitydisordered nanowiresMajorana splittingsemiconductor-superconductor hybridsfinite-size effects
0
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The pith

Disorder even weaker than the gap suppresses exponential Majorana protection in short nanowires

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper calculates the energy splitting between paired Majorana zero modes at the ends of finite-length, disordered nanowires in realistic semiconductor-superconductor models. It finds that the exponential-small-splitting regime, which supplies topological protection, exists only in a narrow window of parameters and vanishes once disorder reaches values somewhat below the topological gap. A sympathetic reader would care because this directly limits how unambiguously one can claim topological character for zero-bias peaks seen in current experiments. The work concludes that topology itself becomes context-dependent rather than a global property of the wire.

Core claim

In experimentally relevant short disordered nanowires, the exponential regime of Majorana splitting is highly constrained and is suppressed for disorder somewhat less than the topological superconducting gap. Consequently, topology in finite disordered wires may not be uniquely defined without a careful, parameter-specific analysis.

What carries the argument

Majorana splitting energy produced by overlap of end-localized modes whose localization length is set by the topological gap and modified by disorder scattering.

If this is right

  • Exponential topological protection holds only when both wire length greatly exceeds the localization length and disorder remains well below the gap.
  • Zero-bias conductance peaks observed in short disordered devices cannot be automatically interpreted as topologically protected Majorana modes.
  • Experimental searches must map splitting versus disorder and length to determine whether a given sample sits inside the protected regime.
  • Topology in finite wires becomes a quantitative, context-dependent statement rather than a binary label.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Longer, cleaner wires will be required before the exponential regime becomes routinely accessible.
  • New diagnostics that do not rely solely on splitting energy may be needed to certify topological character under realistic disorder.
  • Current experimental claims based on short wires may need re-evaluation once the disorder threshold is taken into account.

Load-bearing premise

The calculations rely on realistic models of nanowires currently being used experimentally that accurately capture the combined effects of finite length and disorder on Majorana splitting.

What would settle it

A measurement or simulation in which the splitting energy stays exponentially small even when disorder strength approaches or exceeds the topological gap would directly contradict the claimed constraint.

Figures

Figures reproduced from arXiv: 2507.00128 by Haining Pan, Sankar Das Sarma.

Figure 1
Figure 1. Figure 1: FIG. 1. Band structure as a function of Zeeman field [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. The disorder-averaged maximal MZM splitting en [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. The distribution of the maximal MZM splitting [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. The disorder-averaged maximal MZM splitting en [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. The disorder-average gap size [PITH_FULL_IMAGE:figures/full_fig_p008_6.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. The distribution of the gap size ∆ [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. The quenched average [PITH_FULL_IMAGE:figures/full_fig_p009_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Localization length [PITH_FULL_IMAGE:figures/full_fig_p010_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Band structure as a function of Zeeman field [PITH_FULL_IMAGE:figures/full_fig_p015_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10. Band structure as a function of Zeeman field [PITH_FULL_IMAGE:figures/full_fig_p015_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. The disorder-averaged maximal MZM splitting [PITH_FULL_IMAGE:figures/full_fig_p015_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: FIG. 12. Band structure as a function of [PITH_FULL_IMAGE:figures/full_fig_p016_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: FIG. 13. Band structure as a function of [PITH_FULL_IMAGE:figures/full_fig_p016_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: FIG. 14. Band structure as a function of [PITH_FULL_IMAGE:figures/full_fig_p016_14.png] view at source ↗
read the original abstract

Majorana zero modes (MZMs) are bound midgap topological excitations at the ends of a 1D topological superconductor, which must come in pairs. If the two MZMs in the pair are sufficiently well-separated by a distance much larger than their individual localization lengths, then the MZMs behave as non-Abelian anyons which can be braided to carry out fault-tolerant topological quantum computation. In this `topological' regime of well-separated MZMs, their overlap is exponentially small, leading to exponentially small Majorana splitting, thus enabling the MZMs to be topologically protected by the superconducting gap. In real experimental samples, however, the existence of disorder and the finite length of the 1D wire considerably complicate the situation, leading to ambiguities in defining `topology' since the Majorana splitting between the two end modes may not necessarily be small in disordered wires of short length. We theoretically study this situation by calculating the splitting in experimentally relevant short disordered wires, and explicitly investigating the applicability of the `exponential protection' constraint as a function of disorder, wire length, and other system parameters in realistic models of nanowires currently being used experimentally. We find that the exponential regime is highly constrained, and is suppressed for disorder somewhat less than the topological superconducting gap. We provide detailed results and discuss the implications of our theory for the currently active experimental search for MZMs in superconductor-semiconductor hybrid platforms. A general consequence of our work is that `topology' in finite disordered wires may not be uniquely defined, necessitating a careful analysis which depends on the context.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript numerically computes Majorana splitting energies in short, disordered semiconductor-superconductor hybrid nanowires using realistic models. It concludes that the exponential-protection regime is highly constrained and is suppressed already for disorder strengths somewhat less than the topological superconducting gap, implying that topology cannot be uniquely defined in finite disordered wires without additional context-dependent analysis.

Significance. If the central numerical result holds, the work supplies concrete, experimentally relevant bounds on when exponential protection can be expected in current nanowire platforms. The explicit parameter scan over disorder and length in realistic models is a positive feature that directly addresses ambiguities in defining topology for finite systems.

major comments (2)
  1. The load-bearing claim that the exponential regime is suppressed for disorder 'somewhat less than the topological superconducting gap' requires explicit definition of the gap employed. It is unclear whether the reference gap is the clean-system value or the disorder-renormalized minigap extracted from the density of states or lowest bulk eigenvalue. Because disorder reduces the effective bulk gap, this choice directly affects the reported suppression threshold and the robustness of the constrained-regime conclusion.
  2. Details on the numerical methods, basis sets, convergence criteria, and error estimates for the splitting calculations are not provided. Given that the findings rest on explicit computation of splitting versus disorder and length rather than an analytic reduction, these technical specifications are necessary to assess the reliability of the reported thresholds.
minor comments (2)
  1. Notation for the splitting energy and the localization length should be defined once at first use and used consistently thereafter.
  2. A brief discussion of how the topological gap is extracted in the disordered case (e.g., from the bulk spectrum or local density of states) would improve clarity even if placed in the methods or supplementary material.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the constructive comments. We address each major point below and have revised the manuscript accordingly to improve clarity and reproducibility.

read point-by-point responses
  1. Referee: The load-bearing claim that the exponential regime is suppressed for disorder 'somewhat less than the topological superconducting gap' requires explicit definition of the gap employed. It is unclear whether the reference gap is the clean-system value or the disorder-renormalized minigap extracted from the density of states or lowest bulk eigenvalue. Because disorder reduces the effective bulk gap, this choice directly affects the reported suppression threshold and the robustness of the constrained-regime conclusion.

    Authors: We thank the referee for identifying this important ambiguity. In our calculations the topological superconducting gap is the clean-system value, which defines the scale for exponential protection in the ideal topological regime. We agree that disorder reduces the effective minigap and that this distinction matters for interpreting the suppression threshold. In the revised manuscript we will explicitly state that the comparison uses the clean gap, add a brief discussion of the disorder-renormalized minigap (extracted from the lowest bulk eigenvalue), and include a supplementary panel showing the minigap versus disorder strength to demonstrate that our central conclusion remains robust under either reference. revision: yes

  2. Referee: Details on the numerical methods, basis sets, convergence criteria, and error estimates for the splitting calculations are not provided. Given that the findings rest on explicit computation of splitting versus disorder and length rather than an analytic reduction, these technical specifications are necessary to assess the reliability of the reported thresholds.

    Authors: We agree that these technical details are essential for assessing reliability and reproducibility. The calculations employ a real-space tight-binding discretization of the Bogoliubov–de Gennes Hamiltonian on a one-dimensional chain. In the revised manuscript we will add a dedicated methods paragraph (or appendix) specifying the lattice spacing, basis size, convergence tolerance on the lowest eigenvalues, and error estimation procedure (standard deviation over an ensemble of disorder realizations). These additions will directly address the referee’s request without altering any results. revision: yes

Circularity Check

0 steps flagged

No circularity detected; results from explicit numerical calculations

full rationale

The paper's central claims derive from direct computation of Majorana splitting as a function of disorder strength, wire length, and other parameters in realistic nanowire models. The finding that the exponential regime is highly constrained and suppressed for disorder somewhat less than the topological superconducting gap is presented as an outcome of these calculations rather than any self-referential definition, fitted parameter renamed as a prediction, or load-bearing self-citation chain. No equations or steps reduce by construction to the inputs; the work is self-contained against external benchmarks through explicit simulation of finite-length disordered systems.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard condensed-matter modeling of hybrid nanowires with parameters for length and disorder explored rather than fitted; no new entities are introduced.

free parameters (2)
  • disorder strength
    Key variable scanned to locate the boundary of the exponential regime
  • wire length
    Varied to study short-wire effects on splitting
axioms (2)
  • standard math Majorana zero modes appear in pairs at the ends of a 1D topological superconductor and their overlap produces a finite splitting energy
    Standard property invoked to define the topological regime
  • domain assumption The nanowire is described by a Bogoliubov-de Gennes Hamiltonian incorporating superconducting pairing and disorder
    Standard modeling choice for semiconductor-superconductor hybrids

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discussion (0)

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Reference graph

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