An-Ping Li

An-Ping Li

Distinguished Research Staff

Dr. Li is the Leader for Scanning Tunneling Microscopy Group, and the Leader for Heterogeneities in Quantum Materials Theme in Center for Nanophase Materials Sciences (CNMS) division at the US Department of Energy’s (DOE) Oak Ridge National Laboratory. He received his Ph.D. degree in Condensed Matter Physics in Peking University in 1997 where his dissertation research emphasized the optoelectronic properties of nanomaterials. He then went to Max-Plank-Institute in Halle, Germany as a MPI Fellow to work on self-assembly of ordered nanostructures. In 1999, he joined the Center for Sensor Materials in Michigan State University as a visiting scholar to develop thin film growth of crystalline diamond.  After a brief stint in a start-up company, Galian Photonics in Vancouver, Canada trying to commercializing photonic crystal technologies, he came back to USA and joined the Oak Ridge National Lab in 2002. He moved through the ranks from Research Associate, Research Staff, Senior Research Staff, to Distinguished Staff. In the meantime, he holds joint appointments with the Department of Physics and Astronomy of the University of Tennessee in Knoxville, first as a Adjunct Associate Professor and then a Joint Faculty Professor. An-Ping published many highly impactful papers in topics ranging from fundamental material science through condensed matter physics. 

His primary interests have been the science-driven synthesis and the fundamental physical properties of low-dimensional and quantum materials. The research activities have involved in experimental determinations of structural, electronic, transport, magnetic, and optical properties for energy and quantum information applications. Techniques employed are scanning tunneling microscopy (single-tip and multiple-tip), molecular beam epitaxy, self-assembly, and controlled on-surface chemical reactions.

Research topics include:

1. Electronic and Transport Properties in Low-Dimensional Quantum Materials. He performs both STM and transport measurements on the same sample areas to establish the structure-transport relations down to the atomic scale. New methodologies, such as spin-polarized STM, scanning tunneling potentiometry, and scanning tunneling thermopower microcopy are implemented to probe electronic and spin density of states, electrochemical potentials and thermoelectric voltages on material surfaces.

2. Controlled Synthesis of Low-Dimensional Materials. He synthesizes 2D materials, thin films, and nanostructures, using chemical vapor deposition, molecular beam epitaxy, and a variety of substrate assisted- and self-assembly processes. He then characterizes these materials and study their electronic, magnetic, optical, and transport properties.

3. Magnetism and Electronic Inhomogeneity in Correlated Electronic Materials. He images and manipulates competing electronic phases near the critical transitional points of magnetic, topological, and superconducting materials, and examine the quantum transport in correlation with band topology, symmetry breaking, quantum confinement, electronic instability from mesoscopic down to the atomic scale.

AVS Fellow, 2017

Performance Award, ORNL, 2015

Significant Event Award for Outstanding Research (SEA), ORNL, 2014

CNMS (inaugural) Division Award for Distinguished User Research, ORNL, 2014

Performance Award, ORNL, 2013

Max Planck Society Fellowship, Max Plank Society, Germany, 1997

"Method for Error Correction in Scanning Tunneling Microscope Data” Xiaoguang Zhang, An-Ping Li, Yunmei Chen, Hao Zhang, Xianqi Li”, US Patent, US 10,670,625, June 2020.

“In-situ Scanning Tunneling Microscope Tip Treatment Device for Spin Polarization Imaging,” An-Ping Li, Jianxing Ma, and Jian Shen, US patent, US 7,361,893, 2008.