Harnessing GeSn semiconductors for tomorrow's quantum world

October 6, 2025 The GIST Harnessing GeSn semiconductors for tomorrow's quantum world by Tohoku University edited by Lisa Lock, reviewed by Robert Egan Lisa Lock scientific editor Meet our editorial team Behind our editorial process Robert Egan associate editor Meet our editorial team Behind our editorial process Editors' notes This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: fact-checked peer-reviewed publication trusted source proofread (a) Atomic image of a high-quality GeSn/Ge semiconductor quantum well structure (b) Transistor device fabricated in this study. Credit: Tohoku University An international team of researchers from Forschungszentrum Jülich (Germany), Tohoku University (Japan), and École Polytechnique de Montréal (Canada) has made a significant discovery in semiconductor science by revealing the remarkable spin-related material properties of Germanium-Tin (GeSn) semiconductors. Semiconductors control the flow of electricity that power everyday technology all around us (such as cars and computers). However, technology is progressing at such a breakneck speed that it is straining current semiconductor technologies. "Semiconductors are approaching their physical and energy-efficiency limits in terms of speed, performance, and power consumption," says Makoto Kohda from Tohoku University. "This is a huge issue because we need semiconductors that can keep up as we shift to more demanding needs such as 5G/6G networks and the increased use of artificial intelligence." To overcome these challenges, scientists are turning to new classes of semiconductors, named group IV alloys, that can deliver capabilities beyond what silicon and germanium alone can deliver. The goal is not only to maintain compatibility with the existing silicon-based technology platform, which underpins the global electronics and photonics industry, but also to introduce entirely new functionalities—from faster processing and a lower energy footprint to integration with photonic and quantum technologies. (a) Shubnikov-de Haas oscillations and the quantum Hall effect (b) Temperature dependence of the weak anti-localization effect. Credit: Tohoku University One particularly promising frontier is spintronics, an approach that goes beyond traditional electronics by using the quantum property of the electron's intrinsic angular momentum, commonly known as spin, rather than relying solely on its electrical charge. The new work, published in Communication Materials on October 2, 2025, unravels the material properties of silicon-integrated GeSn alloy, underlining their low in-plane heavy hole effective mass, a large g-factor, and its anisotropy. A hole in a semiconductor is the absence of an electron, which acts like a tiny positive charge. In quantum computing, holes are useful because they can store and process quantum information—allowing fast operations and long coherence times within existing semiconductor platforms. In particular, the team confirmed high spin splitting energy, indicating that GeSn semiconductors may have considerable advantages over conventional materials such as Si and Ge. In addition, it is a highly promising route for qubits and low-power spintronic devices. Importantly, GeSn alloys are compatible with complementary metal-oxide semiconductors (CMOS), positioning this achievement as a critical step toward revolutionary advances in quantum information processing and next-generation electronic devices. Beyond quantum and spintronics, GeSn also provides major advantages in integrated lasing, thermoelectric, and electronic applications. Its unique band structure enables efficient light emission, making it a strong candidate for on-chip lasers and photonics. At the same time, its favorable thermal and electronic properties open possibilities for better thermoelectric energy conversion and more efficient transistors. This versatility makes GeSn not just a material for quantum research, but a multifunctional semiconductor platform that could transform multiple industries. "Future efforts will focus on refining the device designs, scaling down components, and exploring new applications," says Kohda, "This international collaboration further supports GeSn alloys as a game-changing semiconductor that could form the backbone of future technologies." More information: Prateek Kaul et al, GeSn quantum wells as a platform for spin-resolved hole transport, Communications Materials (2025). DOI: 10.1038/s43246-025-00934-9 Journal information: Communications Materials Provided by Tohoku University Citation: Harnessing GeSn semiconductors for tomorrow's quantum world (2025, October 6) retrieved 24 October 2025 from https://phys.org/news/2025-10-harnessing-gesn-semiconductors-tomorrow-quantum.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. 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