Near-single-domain superconducting aluminum films on GaAs(111)A with exceptional crystalline quality for scalable quantum circuits

• URL: http://arxiv.org/abs/2602.17249v1
• Date: Thu, 19 Feb 2026 10:52:42 GMT
• Title: Near-single-domain superconducting aluminum films on GaAs(111)A with exceptional crystalline quality for scalable quantum circuits
• Authors: Hsien-Wen Wan, Yi-Ting Cheng, Chao-Kai Cheng, Jui-Min Chia, Chien-Ting Wu, Sheng-Shiuan Yeh, Chia-Hung Hsu, Jueinai Kwo, Minghwei Hong,
• Abstract summary: We have reproducibly grown near-single-domain superconducting aluminum (Al) films on GaAs (111)A wafers using molecular beam epitaxy.<n> Synchrotron X-ray diffraction revealed twin-domain ratios of 0.00005 and 0.0003 for 19.4-nm- and 9.6-nm-thick films, respectively.<n>The films exhibit critical temperatures approaching bulk values, establishing a materials platform for scalable, high-coherence superconducting qubits.
• Score: 1.1139778052366875
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We have reproducibly grown near-single-domain superconducting aluminum (Al) films on GaAs(111)A wafers using molecular beam epitaxy. Synchrotron X-ray diffraction revealed twin-domain ratios of 0.00005 and 0.0003 for 19.4-nm- and 9.6-nm-thick films, respectively-the lowest reported for Al on any substrate and long considered unattainable for practical device platforms. Azimuthal scans across off-normal Al{$11\bar{1}$} reflections exhibit narrow full width at half maximum (FWHM) values down to $0.55^\circ$, unmatched by epi-Al grown by any other method. Normal scans showed a well-defined (111) orientation with pronounced Pendellösung fringes, and $θ$-rocking-curve FWHM values down to $0.018^\circ$; the former indicates abrupt film-substrate and oxide-film interfaces. Electron backscatter diffraction mapping confirms macroscopic in-plane uniformity and the absence of $Σ$3 twin domains. Atomic force microscopy and scanning transmission electron microscopy confirmed atomically smooth surfaces and abrupt heterointerfaces. The films exhibit critical temperatures approaching bulk values, establishing a materials platform for scalable, high-coherence superconducting qubits.

Related papers

• Magnetic and structural properties of epitaxial Er-substituted yttrium iron garnet films grown by pulsed laser deposition [0.0]
  Er-substituted yttrium iron garnet (Er:YIG) holds the potential of combining the low magnetic damping of YIG with the telecom-band optical transitions.<n>X-ray diffraction, reciprocal space mapping, and scanning transmission electron microscopy confirm single-phase, fully coherent growth with atomically sharp interfaces.
  arXiv  Detail & Related papers  (2025-11-09T10:59:44Z)
• Controlled growth of rare-earth-doped TiO$_{2}$ thin films on III-V semiconductors for hybrid quantum photonic interfaces [0.0]
  Quantum photonic networks require two distinct functionalities: bright single-photon sources and long-lived quantum memories.<n>Here we demonstrate low-temperature pulsed laser deposition of Er$3+$-doped TiO$_2$ thin films directly on GaAs and GaSb substrates.<n>Our results establish a materials platform for monolithically integrating rare-earth quantum memories with semiconductor photon sources.
  arXiv  Detail & Related papers  (2025-11-05T23:42:09Z)
• Microstructural and preliminary optical and microwave characterization of erbium doped CaMoO$_4$ thin films [0.8242237634917229]
  This work explores erbium-doped calcium molybdate (CaMoO$_4$) thin films grown on silicon and yttria stabilized zirconia (YSZ) substrates as a potential solid state system for C-band.
  arXiv  Detail & Related papers  (2025-08-20T23:10:06Z)
• Layered semiconductors integrated with polyimide thin films for high-quality valleytronic and quantum-photonic systems [1.0291559330120414]
  Dielectric integration of layered semiconductors is a prerequisite for fabricating high-quality optoelectronic, valleytronic, and quantum-photonic devices.<n>This work demonstrates the formation of high optical-quality excitons in two widely explored layered semiconductors.
  arXiv  Detail & Related papers  (2025-04-21T09:29:43Z)
• Two superconducting thin films systems with potential integration of different quantum functionalities [0.0]
  Cobalt (Co) thin films grown on silicon (Si) were found to be superconducting.<n>Superconductivity of a hybrid Co film followed by the superconductivity of a CoSi$$ film.<n>Magnetic field scan as a function of $T_c$ shows a monotonic increase in intensity of this peak with temperature.
  arXiv  Detail & Related papers  (2024-12-27T07:23:20Z)
• First Sub-MeV Dark Matter Search with the QROCODILE Experiment Using Superconducting Nanowire Single-Photon Detectors [51.550188330599525]
  We present the first results from the Quantum Resolution-d Cryogenic Observatory for Dark matter Incident at Low Energy (QROCODILE)<n>The QROCODILE experiment uses a microwire-based superconducting nanowire single-photon detector (SNSPD) as a target and sensor for dark matter scattering and absorption.<n>We report new world-leading constraints on the interactions of sub-MeV dark matter particles with masses as low as 30 keV.
  arXiv  Detail & Related papers  (2024-12-20T19:00:00Z)
• Single photon emitters in monolayer semiconductors coupled to transition metal dichalcogenide nanoantennas on silica and gold substrates [49.87501877273686]
  Transition metal dichalcogenide (TMD) single photon emitters offer numerous advantages to quantum information applications. Traditional materials used for the fabrication of nanoresonators, such as silicon or gallium phosphide (GaP), often require a high refractive index substrate. Here, we use nanoantennas (NAs) fabricated from multilayer TMDs, which allow complete flexibility with the choice of substrate.
  arXiv  Detail & Related papers  (2024-08-02T07:44:29Z)
• Sub-meV Linewidths in Polarized Low-Temperature Photoluminescence of 2D PbS Nanoplatelets [0.0]
  Two-dimensional (2D) PbS nanoplatelets (NPLs) exhibiting excitonic emission at 720 nm (1.7 eV) We present the first comprehensive analysis of low-temperature PL from this material class. At 4K, we observe unique PL features in single PbS NPLs, including narrow zero-phonon lines with line widths down to 0.6 meV and a linear degree of polarization up to 90%.
  arXiv  Detail & Related papers  (2024-05-30T08:28:57Z)
• Site-Controlled Purcell-Induced Bright Single Photon Emitters in Hexagonal Boron Nitride [62.170141783047974]
  Single photon emitters hosted in hexagonal boron nitride (hBN) are essential building blocks for quantum photonic technologies that operate at room temperature. We experimentally demonstrate large-area arrays of plasmonic nanoresonators for Purcell-induced site-controlled SPEs. Our results offer arrays of bright, heterogeneously integrated quantum light sources, paving the way for robust and scalable quantum information systems.
  arXiv  Detail & Related papers  (2024-05-03T23:02:30Z)
• Van der Waals Materials for Applications in Nanophotonics [49.66467977110429]
  We present an emerging class of layered van der Waals (vdW) crystals as a viable nanophotonics platform. We extract the dielectric response of 11 mechanically exfoliated thin-film (20-200 nm) van der Waals crystals, revealing high refractive indices up to n = 5. We fabricate nanoantennas on SiO$$ and gold utilizing the compatibility of vdW thin films with a variety of substrates.
  arXiv  Detail & Related papers  (2022-08-12T12:57:14Z)
• Developing a Chemical and Structural Understanding of the Surface Oxide in a Niobium Superconducting Qubit [46.6940373636939]
  We conduct a detailed assessment of the surface oxide that forms in ambient conditions for transmon test devices patterned from a niobium film. In terms of structural analysis, we find that the Nb$ 1-2$O$_5$ region is semicrystalline in nature. We observe that amorphous regions are more likely to contain oxygen vacancies and exhibit weaker bonds between the niobium and oxygen atoms.
  arXiv  Detail & Related papers  (2022-03-16T16:00:57Z)
• Spectral multiplexing of telecom emitters with stable transition frequency [68.8204255655161]
  coherent emitters can be entangled over large distances using photonic channels. We observe around 100 individual erbium emitters using a Fabry-Perot resonator with an embedded 19 micrometer thin crystalline membrane. Our results constitute an important step towards frequency-multiplexed quantum-network nodes operating directly at a telecommunication wavelength.
  arXiv  Detail & Related papers  (2021-10-18T15:39:07Z)
• Discovery of Nb hydride precipitates in superconducting qubits [37.69303106863453]
  We report the first evidence of the formation of niobium hydrides within niobium films on silicon in superconducting qubits fabricated at Rigetti Computing. High-resolution transmission electron microscopy (HRTEM) analyses are performed at room and cryogenic temperatures (106 K) on superconducting qubit niobium film areas. Our findings highlight a new previously unknown source of decoherence in superconducting qubits, contributing to both quasi and two-level system (TLS) losses.
  arXiv  Detail & Related papers  (2021-08-23T20:01:38Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.