Rice University

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Seminar

Physics & Astronomy

Speaker: Je-Geun Park
Seoul National University

Condensed Matter - FEW SURPRISES OF 2D MAGNETISM: From Magnon Breakdown to Magnetic Graphene

Friday, March 10, 2017
4:00 PM  to 5:00 PM

200  Brockman Hall for Physics
Rice University
6100 Main St
Houston, Texas, USA

Materials we are familiar with display amazingly beautiful phenomena. Despite the apparent complexity, however we also know that the underlying basic principles of three-dimensional materials, except for some rare cases, are in fact well accounted for by a couple of simple concepts like quasiparticles and scaling. But it works only up to a point. For example, these comfortable ideas begin to breakdown when one reduces the dimension of materials. In this talk, I will discuss how we have discovered the breakdown of magnon, which is otherwise a stable quasiparticles of magnetic systems [1,2]. And I will also sketch some of potentials offered by a new class of two-dimensional magnetic van der Waals materials [3-5]. [1] Joosung Oh, et al., Phys. Rev. Lett. 111, 257202 (2013) [2] Joosung Oh, et al., Nature Communications 7, 13146 (2016) [3] [Viewpoint] Je-Geun Park, J. Phys. Condens. Matter 28, 301001 (2016) [4] Cheng-Tai Kuo, et al., Scientific Reports 6, 20904 (2016) [5] Jae-Ung Lee, et al., Nano Lett. 16, 7433 (2016)

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