报告人: 任伟 博士
Institute for Nanoscience and Engineering and Physics Department, University of Arkansas, Fayetteville, Arkansas, USA
Abstract
Electronic transport of charge and spin can be controlled by external electric and magnetic fields.
One of the most remarkable transport phenomena at mesoscale and nanoscale is the universal conductance fluctuation.
Because of quantum interference, the amplitude of such fluctuation stays constant independently of the average conductance and sample details.
Based on a variety of nanomaterials, we will show results from perspectives of the electron's intrinsic charge and spin properties.
Then we discuss multiferroic materials that possess both ferroelectric and magnetic orderings,
such that the electric field can control magnetic properties and vice versa.
Particularly, we focus on the formation and characteristics of vortex in some perovskite oxide nanostructures.
The computational and theoretical methods employed in these studies will be introduced.
参考文献:
1. Universal Spin-Hall Conductance Fluctuations in Two Dimensions, Wei Ren, Zhenhua Qiao, Jian Wang, Qingfeng Sun, and Hong Guo, Phys. Rev. Lett. 97, 066603 (2006).
2. Prediction of the magnetotoroidic effect from atomistic simulations, Wei Ren and L. Bellaiche, Phys. Rev. Lett., 107, 127202 (2011).
3. Enhanced electric conductivity at ferroelectric vortex cores in BiFeO3, N. Balke, B. Winchester, W. Ren, Y.H. Chu, A.N. Morozovska, E. Eliseev,
M. Huijben, R.K. Vasudevan, V. Nagarajan, P. Maksymovych, J. Britson, S. Jesse,
I. Kornev, R. Ramesh, L. Bellaiche, L.Q. Chen, and S. V. Kalinin, Nature Physics, 8, 81 (2012).
时间: 2012年5月2日 星期三 下午15:00
地点: 四川大学(望江校区)物理馆三楼323学术报告厅
四川大学物理科学与技术学院