「不可能な物質」の融合に成功(Scientists Merge Two “Impossible” Materials Into New Artificial Structure)

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2025-04-01 ラトガース大学

ラトガース大学の研究チームは、これまで不可能とされていた2種類の合成材料を融合させ、全く新しい量子構造「人工量子サンドイッチ」を作製した。この構造は、空気に触れずに成膜・解析を行う専用マシンで合成され、電子・化学特性を高精度で評価可能。従来は共存できないとされていたトポロジカル絶縁体と超伝導体の特性を併せ持つことで、量子コンピューティングの中核となる新材料開発に道を開くと期待されている。研究は量子物性の理解を深め、超高速・低消費電力の未来技術実現に貢献する可能性がある。

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パイロクロア界面をエピタキシャルに安定化させたウェイル半金属とスピンアイス Epitaxial Stabilization of a Pyrochlore Interface between Weyl Semimetal and Spin Ice

Mikhail Kareev,Xiaoran Liu,Michael Terilli,Fangdi Wen,Tsung-Chi Wu,Dorothy Doughty,Hongze Li,Jianshi Zhou,Qinghua Zhang,Lin Gu,and Jak Chakhalian
Nano Letters  Published: January 2, 2025
DOI:https://doi.org/10.1021/acs.nanolett.4c03969

Abstract

「不可能な物質」の融合に成功(Scientists Merge Two “Impossible” Materials Into New Artificial Structure)

Pyrochlore materials are known for their exotic magnetic and topological phases arising from complex interactions among electron correlations, band topology, and geometric frustration. Interfaces between different pyrochlore crystals characterized by complex many-body ground states hold immense potential for novel interfacial phenomena due to the strong interactions between these phases. However, the realization of such interfaces has been severely hindered by limitations in material synthesis methods. In this study, we discover a robust synthesis method that produces the previously unexplored epitaxial pyrochlore interface between spin ice Dy2Ti2O7 and Weyl semimetal Eu2Ir2O7. The method relies on an ultrahigh supersaturation regime during deposition aided by directional IR-laser-driven thermal gradients, transforming amorphous covalent networks into nearly perfectly ordered, atomically sharp interfaces with a chemically ideal arrangement of ions. The novel pyrochlore interface enables the study of interactions between relativistic Weyl fermions and spin ice magnetic monopoles, opening a path to designing diverse pyrochlore interfaces.

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