摘要

Two-dimensional (2D) hexagonal materials provide a promising platform for valleytronics devices, owing to the convenient generation and manipulation of valley qubits. However, efficient generation of valley information carriers with long valley lifetime is difficult to achieve in single material due to intrinsic valley relaxation channels. Here we show that, such intrinsic limit can be overcome through combining two materials into a van der Waals heterostructure; and report both near-perfect generation efficiency of valley information carriers, as well as record-high valley lifetime. Furthermore, we demonstrate generation, transport, and spatial-temporal imaging of the valley currents in a single device, which opens up new exciting opportunities to realize novel spintronic and valleytronic applications.

报告人简介

EDUCATION:

B. S. in Physics: Peking University, Beijing, China                                  2008.09 ~ 2012.06    

Ph.D. in Physics: University of California at Berkeley, California, U.S.   2012.08 ~ 2017.05

HONORS AND AWARDS：

Leo KoGuan Scholarship                                                                       2010

National Scholarship: twice                                                                   2009, 2011

Outstanding Graduates of Beijing                                                        2012

Lars Commins Memorial Award in Experimental Physics                     2017

RESEARCH EXPERIENCE：

Research Assistant                                                                                2013.01 ~ 2018.6