This is a past event.

Bumho Kim of University of Pennsylvania will present at this Tuesday Physics Colloquium. Bumho Kim's presentation is titled "Customizing Artificial Quantum Materials For Information Technology". 

The seminar will be presented at 11:00 a.m. on Tuesday (Mar. 11) in Fisher 325. 

Abstract  To enable new properties beyond natural materials, metamaterials organize structural units, known as meta-atoms, at scales around a hundred nanometers. However, truly modifying intrinsic material properties requires control at the atomic scale, down to a few ångströms. In this study, we present an innovative approach to engineering lattice symmetries at the atomic scale. Specifically, we twisted and stacked individual van der Waals (vdW) monolayers into redesigned lattice structures, leading to the creation of an artificialquasicrystal [1]. The resulting artificial quasicrystal exhibits unique optical nonlinearity and selectivity, distinct from those observed in natural vdW materials. In addition, we developed an advanced synthesis technique to grow ultraclean vdW crystals with defect densities two orders of magnitude lower than those in previous studies [2]. These advances in material design and synthesis pave the way for customizing artificial quantum materials with precisely tailored spin, electronic, and thermal properties. We will explore how these materials could potentially overcome performance limitations in ultrafast, low-power, and/or quantum computing technologies.

References  [1] Bumho Kim, Jicheng Jin, Zhi Wang, Li He, Thomas Christensen, Eugene J.Mele, and Bo Zhen, Nature Photonics 18, 91-98 (2024). [2] Bumho Kim, Yue Luo, Daniel Rhodes, Yusong Bai, Jue Wang, Song Liu, Abraham Jordan, Baili Huang, Zhaochen Li, Takashi Taniguchi, Kenji Watanabe, Jonathan Owen, Stefan Strauf, Katayun Barmak, Xiaoyang Zhu, and James Hone, ACS Nano 16, 140-147 (2022).

Bio  Bumho Kim received his B.S. and M.S. in Materials Science and Engineering at Seoul National University. Subsequently, he received a Ph.D. in Mechanical Engineering at Columbia University, where he worked with Professor James Hone on the synthesis and characterization of vdW quantum materials. Currently, he is a postdoctoral researcher at the University of Pennsylvania, working with Professor Bo Zhen on twisted vdW materials and ultrafast optical spectroscopy. His research focuses on developing artificial quantum materials for nextgeneration computing applications.