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arxiv: 1907.00134 · v1 · pith:TVKL4L6Xnew · submitted 2019-06-29 · ❄️ cond-mat.mes-hall · quant-ph

Regaining a spatial dimension: Mechanically transferrable two-dimensional InAs nanofins grown by selective area epitaxy

J. Seidl , J.G. Gluschke , X. Yuan , S. Naureen , N. Shahid , H.H. Tan , C. Jagadish , A.P. Micolich
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P. Caroff
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Pith reviewed 2026-05-25 13:22 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall quant-ph
keywords InAs nanofinsselective area epitaxymechanical transferHall mobilityquantum interferencesurface accumulationnanowiresfield-effect mobility
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The pith

InAs nanofins grown by selective-area epitaxy can be mechanically transferred flat to form devices with Hall mobilities up to 1200 cm²/Vs and quantum interference at 20 K.

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

The paper describes growing rectangular InAs nanofins with controlled length, width and height using dielectric-templated selective-area epitaxy, then mechanically transferring them to lie flat on a new substrate. This regains a third spatial dimension for device layout while keeping the advantages of bottom-up epitaxial growth over top-down patterning. Transferred nanofins are fabricated into multi-contact devices with global back-gates and local top-gates that show 3D electron densities of 2.5-5 × 10^17 cm^{-3} matching surface accumulation layers seen in InAs nanowires. Measured Hall mobilities reach 1200 cm²/Vs and field-effect mobilities reach 4400 cm²/Vs, with clear quantum interference persisting to 20 K. The work positions these structures as building blocks for more complex devices that could include patterned superconductor contacts for quantum information uses.

Core claim

Rectangular InAs nanofins with deterministic dimensions are produced as freestanding structures by dielectric-templated selective-area epitaxy and can be mechanically transferred to lie flat on a separate substrate. Devices fabricated from the transferred nanofins, incorporating multiple contacts for Hall and four-terminal measurements plus global and local gates, exhibit electron densities of 2.5-5 × 10^17 cm^{-3} (corresponding to surface accumulation densities of 3-6 × 10^12 cm^{-2}), Hall mobilities as high as 1200 cm²/Vs, field-effect mobilities as high as 4400 cm²/Vs, and quantum interference features visible at temperatures up to 20 K.

What carries the argument

Dielectric-templated selective-area epitaxy that produces freestanding rectangular InAs nanofins which are then mechanically transferred to lie flat, regaining a third dimension for device geometry.

If this is right

  • Multiple ohmic contacts, global back-gates and local top-gates can be added to control density in planar layouts.
  • Patterned superconductor contacts can be incorporated on the transferred fins for hybrid quantum devices.
  • The structures retain bottom-up growth quality while supporting device designs not feasible with upright nanowires.
  • Quantum interference remains observable at 20 K, enabling mesoscopic studies at relatively accessible temperatures.
  • Electron density values consistent with prior InAs nanowire surface accumulation confirm the material behavior carries over after transfer.

Where Pith is reading between the lines

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

  • The flat transfer geometry could allow easier optical or scanning-probe access to the channel compared with vertical nanowires.
  • The method might extend to other III-V materials where selective-area epitaxy is established, enabling similar dimensional flexibility.
  • Dimensional crossover studies become possible by varying nanofin width while keeping the transferred flat orientation.
  • Integration with non-epitaxial substrates or additional 2D layers could be tested by choosing the target transfer substrate.

Load-bearing premise

The mechanical transfer step does not introduce defects or scattering centers that would degrade the reported transport properties.

What would settle it

A side-by-side measurement of mobility or visibility of quantum interference on the same nanofin structure before versus after the transfer step that shows clear degradation after transfer.

Figures

Figures reproduced from arXiv: 1907.00134 by A.P. Micolich, C. Jagadish, H.H. Tan, J.G. Gluschke, J. Seidl, N. Shahid, P. Caroff, S. Naureen, X. Yuan.

Figure 1
Figure 1. Figure 1: Templated growth of 2D nanofin structures a - c Scanning electron micro￾graphs of 2D nanofins post-growth and prior to transfer to a device substrate: a wide-frame showing a large array of identical rectangular structures, b zoom-in of the field in a showing finer detail, and c zoom-in on a single nanofin to highlight the hexagonal structure featuring two large {110} and four smaller {110} facets on the si… view at source ↗
Figure 2
Figure 2. Figure 2: Exerting control over structure via template structure a Overhead (top) and angled (bottom) SEM images of the growth outcome for a sequence of rectangular openings (blue dashed line) at 0◦ , 5◦ , 10◦ , 15◦ , 20◦ , 25◦ and 30◦ relative to the h110i substrate direction (green arrow). The h112i direction (red arrow) is shown for reference. b/c Angled SEM images of growth outcome for b different opening length… view at source ↗
Figure 3
Figure 3. Figure 3: Fabrication of nanofin devices for Hall effect and local gating studies a false-color SEM and b AFM image of a device for Hall effect studies (Device 1) featuring a nanofin (green), source, drain and a pair of Hall contacts H1 and H2 (yellow). c Schematic and false-color SEM and d AFM image of a patterned top-gate device (Device 2) featuring nanofin (green), set of six contacts contacts (yellow), and a HfO… view at source ↗
Figure 4
Figure 4. Figure 4: Electrical characterisation of nanofin Hall device a Source-drain current ISD vs back-gate voltage VBG as a function of temperature T obtained for the ‘normal’ configu￾ration. The ‘rotated’ configuration data appears in Supplementary Fig. S8/9 as discussed in the text. Consecutive traces are offset upwards by 3 nA as T is increased for clarity (lowest T trace has zero offset). b zero-field-scaled longitudi… view at source ↗
Figure 5
Figure 5. Figure 5: Electrical characterisation of dual-gated nanofin device a Source-drain conductance GSD = ISD/VSD vs gate voltage VG for the back-gate with top-gate grounded (blue), top-gate with back-gate grounded (red), and both gates biased together (orange). b GSD vs top-gate voltage VT G at fixed back-gate voltage VBG obtained at VBG = +2 V (brown, top trace), +1 V, 0 V (red), −0.5 V, −1 V, −1.5 V, −2 V and −3 V (gre… view at source ↗
read the original abstract

We report a method for growing rectangular InAs nanofins with deterministic length, width and height by dielectric-templated selective-area epitaxy. These freestanding nanofins can be transferred to lay flat on a separate substrate for device fabrication. A key goal was to regain a spatial dimension for device design compared to nanowires, whilst retaining the benefits of bottom-up epitaxial growth. The transferred nanofins were made into devices featuring multiple contacts for Hall effect and four-terminal resistance studies, as well as a global back-gate and nanoscale local top-gates for density control. Hall studies give a 3D electron density $2.5~-~5 \times 10^{17}$ cm$^{-3}$, corresponding to an approximate surface accumulation layer density $3~-~6 \times 10^{12}$ cm$^{-2}$ that agrees well with previous studies of InAs nanowires. We obtain Hall mobilities as high as $1200$ cm$^{2}$/Vs, field-effect mobilities as high as $4400$ cm$^{2}$/Vs and clear quantum interference structure at temperatures as high as $20$ K. Our devices show excellent prospects for fabrication into more complicated devices featuring multiple ohmic contacts, local gates and possibly other functional elements, e.g., patterned superconductor contacts, that may make them attractive options for future quantum information applications.

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

1 major / 1 minor

Summary. The manuscript reports a method to grow rectangular InAs nanofins of controlled dimensions by dielectric-templated selective-area epitaxy. These freestanding structures are mechanically transferred onto a separate substrate and fabricated into multi-terminal devices incorporating a global back-gate and local top-gates. Hall and four-terminal measurements on the transferred nanofins yield 3D electron densities of 2.5–5 × 10^{17} cm^{-3} (corresponding to surface accumulation densities of 3–6 × 10^{12} cm^{-2}), Hall mobilities up to 1200 cm²/Vs, field-effect mobilities up to 4400 cm²/Vs, and quantum interference features visible at temperatures up to 20 K. The surface density is noted to agree with prior InAs nanowire studies.

Significance. If the mechanical transfer step preserves epitaxial quality without introducing dominant scattering, the approach successfully regains a planar spatial dimension for device design while retaining bottom-up growth advantages. This could enable more complex mesoscopic devices with multiple ohmic contacts, local gates, and possibly superconducting elements for quantum information applications. The reported mobilities and coherence lengths, together with the density agreement with established nanowire literature, would constitute a useful experimental platform if transfer-induced degradation is shown to be negligible.

major comments (1)
  1. [Results (transport measurements)] Results section (transport data): All reported Hall mobilities, field-effect mobilities, and quantum interference data are obtained exclusively after mechanical transfer. No pre-transfer reference measurements on the as-grown nanofins, same-growth-run controls, or quantitative metrics (e.g., mobility ratio or coherence length change) are provided to demonstrate that the transfer step does not introduce additional scattering centers that would account for the observed values. This comparison is load-bearing for the central claim that the transferred nanofins retain device-quality transport properties.
minor comments (1)
  1. [Abstract] Abstract: the density range is written as '2.5~-~5'; replace the tilde construction with a conventional en-dash for typographic consistency.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading and for identifying this important point about the transfer step. We address the comment directly below.

read point-by-point responses

  1. Referee: [Results (transport measurements)] Results section (transport data): All reported Hall mobilities, field-effect mobilities, and quantum interference data are obtained exclusively after mechanical transfer. No pre-transfer reference measurements on the as-grown nanofins, same-growth-run controls, or quantitative metrics (e.g., mobility ratio or coherence length change) are provided to demonstrate that the transfer step does not introduce additional scattering centers that would account for the observed values. This comparison is load-bearing for the central claim that the transferred nanofins retain device-quality transport properties.

    Authors: We agree that a direct pre-/post-transfer comparison on the same structures would provide the strongest possible evidence that mechanical transfer does not introduce dominant scattering. Such measurements were not performed because the as-grown nanofins are vertically oriented and embedded within the dielectric template; fabricating reliable multi-terminal contacts to these freestanding structures prior to transfer is technically impractical without first releasing and flattening them. The transfer process was developed specifically to minimize damage, and the reported 3D densities (2.5–5 × 10^17 cm^{-3}) and mobilities are consistent with the range of values obtained in prior InAs nanowire studies using comparable growth methods. In the revised manuscript we will add an explicit paragraph in the Results section stating that all transport data are post-transfer, noting the experimental constraints on pre-transfer measurements, and presenting the literature agreement as supporting (though indirect) evidence that transfer-induced degradation is not the dominant factor. We believe this revision accurately reflects the experimental situation while strengthening the discussion of the central claim. revision: yes

Circularity Check

0 steps flagged

Purely experimental report with no derivations or model predictions

full rationale

This is a materials-growth and device-measurement paper. The abstract and full text describe selective-area epitaxy growth of InAs nanofins, mechanical transfer to a new substrate, fabrication of Hall-bar and gated devices, and direct extraction of 3D/2D densities plus Hall and field-effect mobilities from measured resistances and gate sweeps. No equations, ansatzes, or fitted parameters are introduced whose outputs are then re-labeled as predictions; the only numerical comparisons are to independent prior nanowire literature. Consequently there are no load-bearing steps that reduce by construction to the paper's own inputs, and the circularity score is 0.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

This is an experimental materials-growth and device-characterization paper. No mathematical derivations, fitted model parameters, or postulated physical entities are introduced; the reported carrier densities are direct experimental outputs from Hall measurements.

pith-pipeline@v0.9.0 · 5822 in / 1320 out tokens · 32018 ms · 2026-05-25T13:22:15.491250+00:00 · methodology

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Reference graph

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