[행사/세미나] [Seminar] Jan. 5(Thur.) Antiferromagnetic van der Waals materials studied with optical spectroscopy
- 물리학과
- 조회수3691
- 2023-01-02
양자물질초전도연구실에서 서강대학교 정현식 교수님을 초청하여 아래와 같이 세미나를 개최합니다.
학과 구성원 여러분의 많은 참여를 부탁 드립니다.
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○ Topic: Antiferromagnetic van der Waals materials studied with optical spectroscopy
○ Speaker: 정 현 식 교수님 (서강대학교)
○ Date/time: 2023. 1. 5. (Thur.) 4:30 PM
○ Place: General Studies(51), Room No. 51306
○ Abstract: Two-dimensional magnetic van der Waals materials have attracted much interest recently. Magnetism in low dimensional systems is an interesting topic for the fundamental physics, and atomically thin magnetic materials are promising candidates for novel spintronic devices. Antiferromagnetic 2-dimensional materials are particularly interesting both for fundamental physics and also for antiferromagnetism-based spintronic devices. However, traditional research tools such as neutron scattering to probe antiferromagnetic ordering cannot be employed for atomically thin materials due to the small sample volume. Although magneto-optical Kerr effect measurements can be used to monitor the magnetic ordering in ferromagnetic materials, the lack of net magnetization precludes the use of the Kerr effect in probing antiferromagnetic ordering. Optical spectroscopy is becoming increasingly important for the study of antiferromagnetic 2-dimensional materials. Raman spectroscopy, for example, has been established as an invaluable tool to probe the magnetic transition in antiferromagnetic van der Waals materials. Furthermore, recent spectroscopic studies revealed a novel coherent state and a low-energy magnon-like excitation in NiPS3, a typical XXZ-type antiferromagnetic layered material, stabilized by the antiferromagnetic ordering. In this presentation, I will review recent results in the study of antiferromagnetism in 2 dimensions using optical spectroscopy.