OQE Seminar
Bevin Huang
University of Washington
Wednesday, September 16, 2020
11:00 AM
Via Zoom (link at the bottom of this announcement)
Title: Emergent phenomena in two-dimensional magnetic crystals
Abstract: The recent discovery of 2D van der Waals (vdW) magnets brings new and exciting opportunities to explore 2D magnetism by harnessing the unique features of atomically thin materials, such as electrostatic gating for magnetoelectronics and flexible heterostructure engineering for emergent interfacial phenomena. In this talk, I will focus on the magneto-optical discoveries enabled by one of these vdW magnets, the magnetic insulator chromium triiodide (CrI3). I will begin by introducing the layered antiferromagnetic properties of CrI3 and its tunability using electric fields. Then, I will discuss the host of magneto-optical phenomena that arise from symmetry-breaking in this 2D magnetic insulator: electrical generation of Kerr signal in an antiferromagnet; giant polarization rotation and magnetoelectrical switching of phonon Raman activity; and discrete angular momentum conservation and its imprint on 2D magnon optical selection rules. At the end, I will provide brief highlights of the progress over the field of magnetic vdW materials and survey the vdW heterostructures that have been realized using these 2D vdW magnets.
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