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arxiv: 2312.04353 · v1 · submitted 2023-12-07 · ❄️ cond-mat.mes-hall · cond-mat.mtrl-sci· cond-mat.supr-con

Interface-Induced Superconductivity in Magnetic Topological Insulator-Iron Chalcogenide Heterostructures

Hemian Yi , Yi-Fan Zhao , Ying-Ting Chan , Jiaqi Cai , Ruobing Mei , Xianxin Wu , Zi-Jie Yan , Ling-Jie Zhou
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Ruoxi Zhang Zihao Wang Stephen Paolini Run Xiao Ke Wang Anthony R. Richardella John Singleton Laurel E. Winter Thomas Prokscha Zaher Salman Andreas Suter Purnima P. Balakrishnan Alexander J. Grutter Moses H. W. Chan Nitin Samarth Xiaodong Xu Weida Wu Chao-Xing Liu Cui-Zu Chang
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Pith reviewed 2026-05-24 04:47 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall cond-mat.mtrl-scicond-mat.supr-con
keywords interface superconductivitymagnetic topological insulatorFeTe heterostructureschiral topological superconductivityferromagnetismMajorana physicsmolecular beam epitaxy
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The pith

Heterostructures of ferromagnetic topological insulator and FeTe induce superconductivity at their interface while preserving ferromagnetism and topological bands in the TI layer.

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

The paper shows that molecular beam epitaxy creates stacks of a ferromagnetic topological insulator and an antiferromagnetic iron chalcogenide FeTe. These stacks develop superconductivity that appears only at the interface between the two materials. The magnetic TI layer keeps both its ferromagnetism and its topological band structure after the stack is formed. Together these features supply the three ingredients required for chiral topological superconductivity. Such structures offer a wafer-scale platform with sharp interfaces for studying Majorana physics.

Core claim

We discover emergent interface-induced superconductivity in magnetic TI/FeTe heterostructures and demonstrate the trifecta occurrence of superconductivity, ferromagnetism, and topological band structure in the magnetic TI layer, the three essential ingredients of chiral TSC. The unusual coexistence of ferromagnetism and superconductivity is attributed to the high upper critical magnetic field exceeding the Pauli paramagnetic limit.

What carries the argument

The interface between the ferromagnetic topological insulator and the antiferromagnetic FeTe, which induces superconductivity while allowing the TI layer to retain its magnetic and topological properties.

If this is right

  • The heterostructures provide an ideal wafer-scale platform for the exploration of chiral TSC and Majorana physics.
  • The robust superconductivity and atomically sharp interfaces enable study of the coexistence of ferromagnetism and superconductivity.
  • The high upper critical field explains how ferromagnetism and superconductivity can coexist.
  • These structures constitute an important step toward scalable topological quantum computation.

Where Pith is reading between the lines

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

  • The interface mechanism could be tested by varying the thickness of the TI layer to see if superconductivity persists only when the interface is present.
  • Similar heterostructures with other iron chalcogenides might yield different topological phases.
  • Device fabrication on these wafers could allow electrical control of the topological superconductivity.
  • The preservation of topology suggests the possibility of observing chiral edge modes coupled to the superconductivity.

Load-bearing premise

The observed superconductivity is caused by the interface itself rather than by defects or contributions from the bulk of either material.

What would settle it

Absence of superconductivity in control samples consisting of the individual materials grown separately or in heterostructures with a non-magnetic buffer layer inserted at the interface.

read the original abstract

When two different electronic materials are brought together, the resultant interface often shows unexpected quantum phenomena, including interfacial superconductivity and Fu-Kane topological superconductivity (TSC). Here, we use molecular beam epitaxy (MBE) to synthesize heterostructures formed by stacking together two magnetic materials, a ferromagnetic topological insulator (TI) and an antiferromagnetic iron chalcogenide (FeTe). We discover emergent interface-induced superconductivity in these heterostructures and demonstrate the trifecta occurrence of superconductivity, ferromagnetism, and topological band structure in the magnetic TI layer, the three essential ingredients of chiral TSC. The unusual coexistence of ferromagnetism and superconductivity can be attributed to the high upper critical magnetic field that exceeds the Pauli paramagnetic limit for conventional superconductors at low temperatures. The magnetic TI/FeTe heterostructures with robust superconductivity and atomically sharp interfaces provide an ideal wafer-scale platform for the exploration of chiral TSC and Majorana physics, constituting an important step toward scalable topological quantum computation.

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

0 major / 2 minor

Summary. The manuscript reports MBE growth of heterostructures stacking a ferromagnetic topological insulator with antiferromagnetic FeTe. It claims emergent interface-induced superconductivity together with preserved ferromagnetism and topological band structure in the magnetic TI layer—the three ingredients required for chiral TSC—supported by transport, magnetic, and spectroscopic measurements that also show an upper critical field exceeding the Pauli limit.

Significance. If the central experimental claims hold, the work supplies a wafer-scale, atomically sharp platform for exploring chiral topological superconductivity and Majorana physics, directly addressing a key materials bottleneck toward scalable topological quantum computation. The reported coexistence of robust superconductivity with ferromagnetism is a notable experimental result.

minor comments (2)
  1. [Abstract] The abstract states that the magnetic TI layer retains both ferromagnetism and topological band structure, but the main text should explicitly cross-reference the specific figures (e.g., magnetization loops and ARPES spectra) that demonstrate these properties remain unchanged after heterostructure formation.
  2. [Discussion] Transport data establishing interface-induced (rather than bulk or defect) superconductivity would benefit from an additional control sample or thickness-dependent study; if already present, it should be highlighted in the discussion section.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive summary of our work on emergent interface superconductivity in magnetic TI/FeTe heterostructures and for recommending minor revision. The assessment correctly identifies the key claims regarding coexistence of superconductivity, ferromagnetism, and topological band structure.

Circularity Check

0 steps flagged

No significant circularity

full rationale

This is a purely experimental paper reporting MBE growth of heterostructures, transport and magnetic measurements, and ARPES data to observe interface superconductivity coexisting with ferromagnetism and topological bands. No derivations, first-principles calculations, fitted parameters renamed as predictions, or self-citation chains are present in the abstract or described claims. All load-bearing assertions (interface origin of SC, preservation of FM and topology) rest on direct experimental controls and data rather than internal definitions or prior self-citations that reduce to the target result.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Experimental report with no free parameters, invented entities, or non-standard axioms; relies on established MBE growth and standard superconductivity measurement techniques.

axioms (1)
  • standard math Standard assumptions of molecular beam epitaxy growth and low-temperature transport measurements in condensed matter physics
    The abstract invokes established experimental methods without introducing new assumptions.

pith-pipeline@v0.9.0 · 5828 in / 1103 out tokens · 20030 ms · 2026-05-24T04:47:06.033586+00:00 · methodology

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Reference graph

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