讲座名称：Modern models of Electron Emission for 2D materials and its applications

讲座时间：2025年10月14日 下午 3:00

报告人：Lay Kee Ang教授  新加坡科技设计大学

校区：西安交通大学创新港校区

讲座地点：创新港躬行楼（3号巨构）3-2031

邀请人：孟国栋教授

Title: Modern models of Electron Emission for 2D materials and its applications

Time： 3:00 pm 14^th October 2025，

Venue：3-2031，Gongxing Building，I-harbor campus

Speaker：Professor Lay Kee Ang, Singapore University of Technology and Design, Singapore

Inviter：Professor Guodong Meng

报告摘要：Electron emission from a cathode through an interface to vacuum or another medium is a fundamental process in beam, plasma, gas ionization, and electrical contact. Depending on the energy used to produce the electrons, it can be broadly characterized into 3 processes: thermionic emission TE (thermal energy), field emission FE (quantum tunneling), and photoemission PE (photon absorption or optical tunneling). At high current regime, the emission current density will become the space charge limited emission (SCLE). Basic models for these emissions (TE, PE, PE, SCLE) for metals or traditional materials have been widely studied: Richardson law, Fowler-Nordheim (FN) law, Fowler-Dubridge (FD), Keldysh model, and Child-Langmuir (CL) law. With the development of two-dimensional (2D) materials, these classical emission models will require new revision to account for various new operating conditions. The effects of roughness of cathode cannot be ignored especially for ultrathin cathode like 2D materials. In this talk, we will present some recent emission models to account for 2D materials and cathode roughness based on fractional calculus. New scaling laws will be reported different from the traditional models.

报告人简介：Prof. Lay Kee (Ricky) Ang received his MSc and PhD degrees from the University of Michigan, USA. He is currently the Associate Provost (International Relations), Ng Teng Fong Chair Professor, and Professor of Science, Mathematics and Technology in the Singapore University of Technology and Design (SUTD). Before joining SUTD, he was a professor in the Division of Microelectronics, School of EEE, Nanyang Technological University, Singapore (2002-2011), and a LANL director postdoctoral fellow (1999-2001) in the Applied Physics division, Los Alamos National Laboratory (LANL). His current research interests are in the theoretical formulation of electron emission, charge transport, electrical contact, and light-matter interaction for applications in electronics, photonics and plasmas. For modeling, he is currently applying fractional calculus to analyze complicated and disordered systems. His research projects were/are funded by Singapore (MOE, ASTAR, SUTD) and USA (AFOSR and ONRG). He has 4 fellows: APS, IEEE, IOP and AAIA. He is a IEEE Distinguished Lecturer and Top 2% Scientist in Applied Physics.

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