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Proceedings Paper

Spin-orbit coupled superconductivity at the interface of LaAlO3/SrTiO3
Author(s): Chi‐Sheng Li; Akhilesh Kr. Singh; Ming-Yuan Song; Wei-Li Lee
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Paper Abstract

We have grown few unit cells of epitaxial LaAlO3 (LAO) on TiO2 terminated SrTiO3 (STO) substrates using oxide MBE technique, which shows an interface superconductivity below about 0.3 K. By fabricating a back gate electrode via the STO substrate, the superconductor-to-insulator transition was observed by applying gate voltages on a macroscopic size of the two-dimensional electron liquid (2DEL) at the interface of LAO/STO. From the superconducting critical field anisotropy measurements, a sizable spin-orbit coupling is found to present in the superconducting phase, where the upper limit of the spin-orbit coupling strength can be largely tuned by gate voltages. In addition, magnetotransport anomaly was observed when depleting the electron density and thus driving the 2DEL into insulating phase, suggesting an inhomogeneous density distribution and also a possible multiband conduction in the 2DEL.

Paper Details

Date Published: 8 March 2017
PDF: 7 pages
Proc. SPIE 10105, Oxide-based Materials and Devices VIII, 101051T (8 March 2017);
Show Author Affiliations
Chi‐Sheng Li, Institute of Physics, Academia Sinica (Taiwan)
Akhilesh Kr. Singh, Institute of Physics, Academia Sinica (Taiwan)
Ming-Yuan Song, Institute of Physics, Academia Sinica (Taiwan)
Wei-Li Lee, Institute of Physics, Academia Sinica (Taiwan)

Published in SPIE Proceedings Vol. 10105:
Oxide-based Materials and Devices VIII
Ferechteh H. Teherani; David C. Look; David J. Rogers, Editor(s)

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