报告题目：Strain engineering of graphene - Resonator, Quantum Dot and Nanobubble
报告人：齐泽南，波士顿大学
时间：8月12日（周一）下午4:00
地点：力一楼239多媒体教室
邀请研究生和本科生们积极参加并交流。齐泽南是我系2010届本科毕业生，现为美国波士顿大学博士研究生。
Abstract：Since its recent discovery as the simplest two-dimensional crystal structure, graphene has attracted intense attention not only for its unusual physical properties, but also for its potential as the basic building block for nanoelectromechanical systems (NEMS) by strain engineering. However, there exist key limitations that appear to restrict its application : one is that pristine graphene is well known to be a semi-metal with no band gap, a highly active field of study has recently emerged based on the idea of applying mechanical strain to generate a bandgap or transport gaps in graphene; Another one is its low quality (Q)-factor as a sensing component. Moreover, recently Q-factor studies are all on pristine graphene from scotch-tape method. In following sections, we used Molecular Dynamics (MD), Tight
Bind (TB) and quantum transport to first study the impact of CVD-induced grain boundary on Q factor, then hexagonal pseudo-magnetic field (PMF) quantum dot by two dimensional tri-axial strain, and lastly investigate PMF distributions of graphene nanobubbles by three dimensional inflation.
About the speaker：Zenan Qi is currently a PhD candidate of Prof. Harold S.Park's group in Mechanical Engineering Department of Boston University. He received Master of Science from Boston University in 2012 and Bachelor of Science from University of Science and Technology of China in 2010. His research interests include computational mechanics spanning continuum mechanics, molecular dynamics, tight binding, multi-scale modeling and mechanical-electronic coupling of nano-materials. At present, Zenan is actively working on "strain engineering" of graphene, MoS2 and other 2D materials, such as wrinkling, bubbles, pseudo magnetic field, nano-resonator, etc.
Publication List：
1. Jiang, JW; Z.N. Qi; Park, Harold; Rabczuk, Timon, Elastic Bending Modulus of Single-Layer Molybdenum Disulphide (MoS2): Finite Thickness Effect, Submitted. arXiv:1307.7509
2. Z.N. Qi, P. Cao, H.S. Park, Density Functional Theory Calculation of Edge Stresses in Monolayer MoS2, Submitted.
3. Z.N. Qi, D.A. Bahamon, V.M. Pereira, H.S. Park, D.K. Campbell and A.H. Castro Neto, Resonant Tunneling in Graphene Pseudomagnetic Quantum Dots, Nano Letters 2013, 13 (6), pp 2692–2697.
4. A.L. Kitt, Z.N. Qi, S. Remi, H.S. Park, A.K. Swan and B.B. Goldberg. How Graphene Slides: Measurement and Theory of Frictional Forces Between Graphene and SiO2, Nano Letters 2013, 13 (6), pp 2605–2610.
5. Z.N. Qi, HS Park, Intrinsic energy dissipation in CVD-grown graphene nanoresonators, Nanoscale 2012, 4(11), 3460-3465.
6. Z.N. Qi, F Zhao, X Zhou, Z Sun, HS Park, H Wu, A molecular simulation analysis of producing monatomic carbon chains by stretching ultranarrow graphene nanoribbons, Nanotechnology 2010, 21 (26), 265702.