中国物理B ›› 2013, Vol. 22 ›› Issue (11): 116803-116803.doi: 10.1088/1674-1056/22/11/116803

所属专题: TOPICAL REVIEW — Magnetism, magnetic materials, and interdisciplinary research

• SPECIAL TOPIC --- Non-equilibrium phenomena in soft matters • 上一篇    下一篇

High-mobility two-dimensional electron gases at oxide interfaces:Origin and opportunities

陈允忠a, Nini Prydsa, 孙继荣b, 沈保根b, Søren Linderotha   

  1. a Department of Energy Conversion and Storage, Technical University of Denmark, Risø Campus, Roskilde 4000, Denmark;
    b Beijing National Laboratory for Condensed Matter Physics, State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2013-09-02 出版日期:2013-09-28 发布日期:2013-09-28

High-mobility two-dimensional electron gases at oxide interfaces:Origin and opportunities

Chen Yun-Zhong (陈允忠)a, Nini Prydsa, Sun Ji-Rong (孙继荣)b, Shen Bao-Gen (沈保根)b, Søren Linderotha   

  1. a Department of Energy Conversion and Storage, Technical University of Denmark, Risø Campus, Roskilde 4000, Denmark;
    b Beijing National Laboratory for Condensed Matter Physics, State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2013-09-02 Online:2013-09-28 Published:2013-09-28
  • Contact: Chen Yun-Zhong E-mail:yunc@dtu.dk

摘要: Our recent experimental work on metallic and insulating interfaces controlled by interfacial redox reactions in SrTiO3-based heterostructures is reviewed along with a more general background of two-dimensional electron gas (2DEG) at oxide interfaces. Due to the presence of oxygen vacancies at the SrTiO3 surface, metallic conduction can be created at room temperature in perovskite-type interfaces when the overlayer oxide ABO3 has Al, Ti, Zr, or Hf elements at the B sites. Furthermore, relying on interface-stabilized oxygen vacancies, we have created a new type of 2DEG at the heterointerface between SrTiO3 and a spinel γ-Al2O3 epitaxial film with compatible oxygen ion sublattices. This 2DEG exhibits an electron mobility exceeding 100000 cm2·V-1·s-1, more than one order of magnitude higher than those of hitherto investigated perovskite-type interfaces. Our findings pave the way for the design of high-mobility all-oxide electronic devices and open a route toward the studies of mesoscopic physics with complex oxides.

关键词: oxide interfaces, two-dimensional electron gas (2DEG), SrTiO3, oxygen vacancies

Abstract: Our recent experimental work on metallic and insulating interfaces controlled by interfacial redox reactions in SrTiO3-based heterostructures is reviewed along with a more general background of two-dimensional electron gas (2DEG) at oxide interfaces. Due to the presence of oxygen vacancies at the SrTiO3 surface, metallic conduction can be created at room temperature in perovskite-type interfaces when the overlayer oxide ABO3 has Al, Ti, Zr, or Hf elements at the B sites. Furthermore, relying on interface-stabilized oxygen vacancies, we have created a new type of 2DEG at the heterointerface between SrTiO3 and a spinel γ-Al2O3 epitaxial film with compatible oxygen ion sublattices. This 2DEG exhibits an electron mobility exceeding 100000 cm2·V-1·s-1, more than one order of magnitude higher than those of hitherto investigated perovskite-type interfaces. Our findings pave the way for the design of high-mobility all-oxide electronic devices and open a route toward the studies of mesoscopic physics with complex oxides.

Key words: oxide interfaces, two-dimensional electron gas (2DEG), SrTiO3, oxygen vacancies

中图分类号:  (Oxide surfaces)

  • 68.47.Gh
73.20.-r (Electron states at surfaces and interfaces) 81.15.Fg (Pulsed laser ablation deposition)