Imaging and tuning polarity at SrTiO 3 domain walls

Yiftach Frenkel, Noam Haham, Yishai Shperber, Christopher Bell, Yanwu Xie, Zhuoyu Chen, Yasuyuki Hikita, Harold Y. Hwang, Ekhard K.H. Salje, Beena Kalisky

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Electrostatic fields tune the ground state of interfaces between complex oxide materials. Electronic properties, such as conductivity and superconductivity, can be tuned and then used to create and control circuit elements and gate-defined devices. Here we show that naturally occurring twin boundaries, with properties that are different from their surrounding bulk, can tune the LaAlO 3 /SrTiO 3 interface 2DEG at the nanoscale. In particular, SrTiO 3 domain boundaries have the unusual distinction of remaining highly mobile down to low temperatures, and were recently suggested to be polar. Here we apply localized pressure to an individual SrTiO3 twin boundary and detect a change in LaAlO3 /SrTiO3 interface current distribution. Our data directly confirm the existence of polarity at the twin boundaries, and demonstrate that they can serve as effective tunable gates. As the location of SrTiO3 domain walls can be controlled using external field stimuli, our findings suggest a novel approach to manipulate SrTiO3 -based devices on the nanoscale.

Original languageEnglish
Pages (from-to)1203-1208
Number of pages6
JournalNature Materials
Volume16
Issue number12
DOIs
StatePublished - 1 Dec 2017

Bibliographical note

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© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.

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