Distinguishing Majorana zero modes from trivial defect states on the surface of the iron-based superconductor Fe(Te,Se)

Dongfei Wang; Freek Massee; Genda Gu; Jon Ortuzar; Roland Wiesendanger; Ruidan Zhong; Wende Xiao; Yugui Yao

arxiv: 2606.17499 · v1 · pith:QHXBUXDAnew · submitted 2026-06-16 · ❄️ cond-mat.supr-con · cond-mat.mes-hall· cond-mat.mtrl-sci

Distinguishing Majorana zero modes from trivial defect states on the surface of the iron-based superconductor Fe(Te,Se)

Dongfei Wang , Jon Ortuzar , Freek Massee , Ruidan Zhong , Genda Gu , Wende Xiao , Yugui Yao , Roland Wiesendanger This is my paper

Pith reviewed 2026-06-26 22:32 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con cond-mat.mes-hallcond-mat.mtrl-sci

keywords Majorana zero modesFe(Te,Se)Yu-Shiba-Rusinov statesscanning tunneling spectroscopytopological superconductorspin-polarized tunnelingdefect states

0 comments

The pith

Spin-polarized tunneling shows zero-energy states on Fe(Te,Se) are trivial defects, not Majorana modes.

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

The paper examines localized states near zero energy on the surface of the iron-based superconductor Fe(Te,Se). It finds that states at structural defects like step edges and line defects are topologically trivial Yu-Shiba-Rusinov states, identified through their spin polarization and response to magnetic fields. Even in defect-free regions, the zero-energy bound states do not match the expected behavior of Majorana zero modes based on spatial and field-dependent spin-resolved spectra. This work highlights the need for careful verification to avoid misidentifying trivial states as Majorana candidates in the search for topological quantum computation platforms.

Core claim

Near-zero-energy localized states at multiple structural defects on the Fe(Te,Se) surface are Yu-Shiba-Rusinov states, and zero-energy states without defects cannot be attributed to Majorana bound states based on combined spatial and magnetic field dependent spin-resolved tunneling spectra.

What carries the argument

Spin-polarized scanning tunneling spectroscopy measuring the spin dependence of tunneling spectra along with spatial and magnetic field dependence to distinguish state origins.

If this is right

Trivial defect states can produce near-zero-energy peaks that mimic Majorana signatures in energy alone.
Spin-resolved measurements plus magnetic field dependence are required to rule out trivial origins.
Regions without surface defects still host zero-energy states whose origin is not Majorana.
Careful spin-dependent studies are necessary when pursuing Majorana zero modes in this compound.

Where Pith is reading between the lines

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

Prior claims of Majorana modes in Fe(Te,Se) that relied only on zero-bias peaks may require re-examination with spin data.
The same combined spatial-plus-field spin analysis could be applied to other candidate topological superconductors to reduce false positives.
It implies spin polarization serves as a practical experimental discriminator between trivial and topological zero modes.

Load-bearing premise

The observed spin polarization, spatial dependence, and magnetic field response of the zero-energy states are incompatible with the signatures expected for Majorana bound states in this material.

What would settle it

Observation of zero-energy states whose spin polarization and magnetic field response match the theoretical predictions for Majorana bound states in Fe(Te,Se).

read the original abstract

Majorana zero modes, which obey non-Abelian exchange statistics, are promising candidates for topological quantum computation due to their robustness against environmental perturbations. The iron-based superconductor Fe(Te,Se) has been identified as an intrinsic topological superconductor, possibly hosting Majorana zero modes. In this paper, we report the observation of near-zero-energy localized states at multiple structural defects on the Fe(Te,Se) surface, which could be misidentified as Majorana zero modes without additional verification. By using spin-polarized scanning tunneling spectroscopy, we demonstrate that the near-zero-energy localized states on step edges and line defects originate from topologically trivial Yu-Shiba-Rusinov states. In addition, zero-energy bound states are also observed for regions without surface defects. A combined spatial and magnetic field dependent analysis of the spin-resolved tunneling spectra in these regions reveals that this type of zero-energy states cannot be attributed to the presence of Majorana bound states. These findings emphasize the importance of spin-dependent studies of low-energy states for pursuing Majorana zero modes.

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.

Desk Editor's Note private letter to a colleague

This paper uses spin-polarized STS to classify zero-energy states at defects in Fe(Te,Se) as YSR and to rule out Majorana bound states in clean regions via spatial and field dependence.

read the letter

The main takeaway is that zero-energy states on the Fe(Te,Se) surface are not Majorana bound states. Spin-polarized scanning tunneling spectroscopy shows the states at step edges and line defects carry the spin signature of Yu-Shiba-Rusinov states, while states in defect-free areas deviate from Majorana expectations in both spatial profile and magnetic-field evolution.

The work applies the standard spin-resolved method to this specific material and covers both defect and clean regions in one study. That combination supplies concrete data on a candidate topological superconductor where misidentification has been a known risk. The paper does a straightforward job of documenting the observations and drawing the distinction without introducing new theory.

The soft spots are limited. The strength of the clean-region exclusion rests on how clearly the measured spin and field responses differ from predicted Majorana behavior; the abstract states incompatibility but the figures will determine how definitive that is. No internal contradictions or unreported controls stand out from the description, and the method matches what the field already uses for this comparison.

This paper is for experimentalists doing STM on iron-based superconductors or tracking Majorana searches in similar systems. A reader who needs practical checks on zero-bias state identification will find the results directly useful.

It deserves a serious referee because the measurements address a real experimental concern with appropriate tools and the claims are grounded in observable data rather than fitting or circular arguments. I would send it out for review.

Referee Report

0 major / 3 minor

Summary. The manuscript reports spin-polarized scanning tunneling spectroscopy measurements on Fe(Te,Se) surfaces, identifying near-zero-energy localized states at structural defects (step edges and line defects) as topologically trivial Yu-Shiba-Rusinov states. It further observes zero-energy bound states in defect-free regions and uses combined spatial and magnetic-field-dependent analysis of the spin-resolved spectra to conclude that these states cannot be attributed to Majorana bound states.

Significance. If the experimental conclusions hold, the work provides a clear demonstration that spin-resolved STS combined with spatial and field dependence is required to rule out trivial origins for zero-bias states in Fe(Te,Se). This strengthens the methodological standard for identifying candidate Majorana zero modes in iron-based topological superconductors and supplies concrete counter-examples of states that could otherwise be misidentified.

minor comments (3)

Abstract: the phrase 'multiple structural defects' is used without quantifying the number or distribution of defects examined; adding a brief statement on sample statistics would improve reproducibility.
The manuscript would benefit from an explicit statement (perhaps in the discussion section) of the expected spin-polarization and spatial-decay signatures for a true Majorana zero mode in this material, against which the observed data are compared.
Figure captions and axis labels should consistently report the spin-polarization direction and the precise magnetic-field values used in the field-dependent maps.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of our manuscript, accurate summary of the key results, and recommendation for minor revision. The significance statement correctly identifies the methodological implications of our spin-resolved measurements. No major comments were listed in the report.

Circularity Check

0 steps flagged

No significant circularity; experimental claims rest on direct observations

full rationale

The paper presents experimental STS data on zero-energy states in Fe(Te,Se). Claims that certain states are YSR (not Majorana) and that defect-free zero-bias states are incompatible with Majorana rest on measured spatial profiles, spin polarization, and magnetic-field evolution. No equations, parameter fits, or derivations appear; no self-citation chain is invoked to justify the central inference. The analysis is self-contained against external benchmarks (standard spin-resolved STS methods in the literature) and does not reduce any prediction to its own inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Review based on abstract only; no free parameters, axioms, or invented entities are identifiable from the provided text.

pith-pipeline@v0.9.1-grok · 5760 in / 1121 out tokens · 45860 ms · 2026-06-26T22:32:56.774006+00:00 · methodology

discussion (0)

Reference graph

Works this paper leans on

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2015