title: Visualization of a ferromagnetic metallic edge state in manganite strips.
abstract: Recently, broken symmetry effect induced edge states in two-dimensional electronic systems have attracted great attention. However, whether edge states may exist in strongly correlated oxides is not yet known. In this work, using perovskite manganites as prototype systems, we demonstrate that edge states do exist in strongly correlated oxides. Distinct appearance of ferromagnetic metallic phase is observed along the edge of manganite strips by magnetic force microscopy. The edge states have strong influence on the transport properties of the strips, leading to higher metal-insulator transition temperatures and lower resistivity in narrower strips. Model calculations show that the edge states are associated with the broken symmetry effect of the antiferromagnetic charge-ordered states in manganites. Besides providing a new understanding of the broken symmetry effect in complex oxides, our discoveries indicate that novel edge state physics may exist in strongly correlated oxides beyond the current two-dimensional electronic systems.
authors: State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors: Kai
authors: K
authors: Du
authors: State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors: Kai
authors: K
authors: Zhang
authors: Department of Physics, Southeast University, Nanjing 211189, China.
authors: Shuai
authors: S
authors: Dong
authors: 1] State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China [2] College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050024, China.
authors: Wengang
authors: W
authors: Wei
authors: State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors: Jian
authors: J
authors: Shao
authors: 1] State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China [2] Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100080, China.
authors: Jiebin
authors: J
authors: Niu
authors: State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors: Jinjie
authors: J
authors: Chen
authors: State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors: Yinyan
authors: Y
authors: Zhu
authors: State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors: Hanxuan
authors: H
authors: Lin
authors: Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska Lincoln, Lincoln, Nebraska 68588-0299, USA.
authors: Xiaolu
authors: X
authors: Yin
authors: Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska Lincoln, Lincoln, Nebraska 68588-0299, USA.
authors: Sy-Hwang
authors: SH
authors: Liou
authors: 1] State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China [2] Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors: Lifeng
authors: L
authors: Yin
authors: 1] State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China [2] Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors: Jian
authors: J
authors: Shen