journal article·2019-10-09

Real-Space Imaging of Orbital Selectivity on SrTiO3(001) Surface

Chuangye Song, Xuanyi Li, Ying Jiang, Xi Wang, Jiannian Yao, Sheng Meng, Jinxing Zhang

ACS Applied Materials & Interfaces· Volume 11· Issue 40
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Abstract

Real-space access of the orbital degree of freedom in complex oxides is still challenging due to intricate electronic hybridization. Here, we report a direct observation of reproducible orbital-selective tunneling on a novel SrTiO3(001) surface by scanning tunneling microscopy. The electronic structures reversibly switch between two different sets of symmetries depending on the sample bias, which is accompanied by a remarkable change in energy-dependent spectroscopy data. Tunneling spectrum combined with density functional theory calculations elucidates that symmetry-breaking at the surface determines the crystal-splitting field of eg/t2g orbitals with a strong in-plane anisotropy so that electrons alternatingly fill eg and t2g orbitals during the imaging process with different biases. This surface superstructure provides a new strategy toward understanding orbital textures and orbital selectivity in complex oxides.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Semiconductor materials and devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Beijing Normal University, Beijing 100875, China

Institute of Physics, Chinese Academic of Science, Beijing 100190, China

School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China

International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China

Key Laboratory of Luminescence and Optical Information, Ministry of Education, Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, China

Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China

Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Science, Beijing 100190, China

Funding

Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Chinese Academy of Sciences

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