高等研究院Institute forAdvanced Study

学术讲座七十七

报告题目：Exploring Mesoscale Materials Physics with Non-equilibrium Statistical Mechanics

报告人   ：Dr. Nan Wang

                   Physics department, McGill University

报告时间：2018年1月23日9:30-10:30

报告地址：办公楼628会议室（原620-12会议室）

About the Speaker

Nan Wang received his Physics Ph.D. from Northeastern University, Boston, in 2012. He did his postdoc research in Nuclear Engineering at Purdue University and Materials Science and Engineering at Pennsylvania State University before his current appointment as a Research Associate in the Physics department of McGill University.

Talk Introduction

Many interesting materials behaviors that are important to macroscopic functionality begin to manifest not at atomic or nanoscale but mesoscale. Theoretical and computational understanding of mesoscale material physics received increasing attention in the last decade. Derived from statistical mechanics, phase-field and phase-field-crystal methods are well-known for their capability in solving mesoscale materials problems. In this talk, I will give a brief introduction of phase-field and phase-field-crystal methods, and demonstrate how they can help us to understand mesoscale materials behavior. I will start with a traditional topic of alloy strengthening and discuss a new two-mode theory of grain-boundary precipitate interaction that is validated using a phase-field-crystal model. In the second example, I will show the formulation and validation of a new phase-field model for Vapor-Liquid-Solid nanowire growth. Towards the end, I will present a recently developed phase-field-crystal model that bridges our knowledge of electromigration on electron level and continuum scale.