Electric field control of the LaAlO3/SrTiO3 interface ground state
By A. Caviglia, S. Gariglio, N. Reyren, D. Jaccard, T. Schneider, M. Gabay, S. Thiel, G. Hammerl, J. Mannhart, J. Triscone. Nature, 2008
1,027 citations recorded by the source corpus.
Interfaces between complex oxides are emerging as one of the most interesting systems in condensed matter physics. In this special setting, in which translational symmetry is artificially broken, a variety of new and unusual electronic phases can be promoted. Theoretical studies predict complex phase diagrams and suggest the key role of the charge carrier density in determining the systems’ ground states. A particularly fascinating system is the conducting interface between the band insulators LaAlO3 and SrTiO3 (ref. 3). Recently two possible ground states have been experimentally identified: a magnetic state and a two-dimensional superconducting condensate. Here we use the electric field effect to explore the phase diagram of the system. The electrostatic tuning of the carrier density allows an on/off switching of superconductivity and drives a quantum phase transition between a two-dimensional superconducting state and an insulating state. Analyses of the magnetotransport properties in the insulating state are consistent with weak localization and do not provide evidence for magnetism. The electric field control of superconductivity demonstrated here opens the way to the development of new mesoscopic superconducting circuits.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/adc3158213b96c61394bb8c3f472a7aece87ad0d
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Citations in the corpus
- Fermi Surface of the Most Dilute Superconductor (2012, background): “Before attaining such a low carrier density, the superconducting ground state is destroyed by a superconductor-to-insulator transition [34], which occurs when kF‘ 1.”
- Origin of the Two-Dimensional Electron Gas at LaAlO 3 /SrTiO 3 Interfaces: The Role of Oxygen Vacancies and Electronic Reconstruction (2013, background): “This result agrees with previous reports [16,37].”
- Nanoscale Phenomena in Oxide Heterostructures (2014, background): “Again, a characteristic superconducting dome has been observed as a function of carrier density (Figure 5a) (98),”