유전체물성연구소

아래와 같이 세미나를 개최하오니, 많은 관심과 참석을 부탁드립니다.

* 일시 : 2026.03.20(금) 11:00~

* 장소 : 공동연구기기동 310(세미나실)

* 연사 : 송만석 교수(동아대)

* 제목 :  Topotactic Mutual-Exchange Growth of Magnetic Zintl Phases from III?V Semiconductors

* 초록 : 

The synthesis of advanced materials with controlled composition, structure, and functionality continues to expand the field of materials science. Here, a topotactic mutual-exchange growth method is presented, transforming III-V semiconductor nanowires and thin films into exotic magnetic Zintl compounds via molecular beam epitaxy (MBE). This unique mechanism involves solid-state exchange of Europium (Eu) and Indium (In), forming single-crystalline Zintl phases while preserving the original semiconductor lattice motifs. Wurtzite InAs nanowires are topotactically converted into Eu₃In₂As₄ nanowires, exhibiting antiferromagnetic transitions and classified as C₂T axion insulators with chiral hinge modes and Dirac surface states. Zincblende InAs(Sb) nanowires similarly convert to Eu₅In₂As₆, featuring distinct antiferromagnetic phases around 7 K and 16 K, classified as antiferromagnets as well as potential altermagnets for spintronic applications. This growth mechanism has been extended to thin-films and has enabled the exploration of new combinations of Zintl compounds using other III-V semiconductor materials, such as GaAs and InP. Furthermore, this topotactic mutual-exchange approach offers new avenues for designing magnetic, thermoelectric, and topological materials, significantly advancing applications in spintronics, quantum computing, and electronics.

감사합니다.

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