Gate-tunable giant nonreciprocal charge transport in noncentrosymmetric oxide interfaces

Daeseong Choe, Mi Jin Jin, Shin Ik Kim, Hyung Jin Choi, Junhyeon Jo, Inseon Oh, Jungmin Park, Hosub Jin, Hyun Cheol Koo, Byoung Chul Min, Seokmin Hong, Hyun Woo Lee, Seung Hyub Baek, Jung Woo Yoo

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1 Citation (Scopus)

Abstract

A polar conductor, where inversion symmetry is broken, may exhibit directional propagation of itinerant electrons, i.e., the rightward and leftward currents differ from each other, when time-reversal symmetry is also broken. This potential rectification effect was shown to be very weak due to the fact that the kinetic energy is much higher than the energies associated with symmetry breaking, producing weak perturbations. Here we demonstrate the appearance of giant nonreciprocal charge transport in the conductive oxide interface, LaAlO3/SrTiO3, where the electrons are confined to two-dimensions with low Fermi energy. In addition, the Rashba spin–orbit interaction correlated with the sub-band hierarchy of this system enables a strongly tunable nonreciprocal response by applying a gate voltage. The observed behavior of directional response in LaAlO3/SrTiO3 is associated with comparable energy scales among kinetic energy, spin–orbit interaction, and magnetic field, which inspires a promising route to enhance nonreciprocal response and its functionalities in spin orbitronics.

Original languageEnglish
Article number4510
JournalNature communications
Volume10
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Choe, D., Jin, M. J., Kim, S. I., Choi, H. J., Jo, J., Oh, I., Park, J., Jin, H., Koo, H. C., Min, B. C., Hong, S., Lee, H. W., Baek, S. H., & Yoo, J. W. (2019). Gate-tunable giant nonreciprocal charge transport in noncentrosymmetric oxide interfaces. Nature communications, 10(1), [4510]. https://doi.org/10.1038/s41467-019-12466-1