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 and Jung-Woo Yoo ()
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Daeseong Choe: Ulsan National Institute of Science and Technology
Mi-Jin Jin: Ulsan National Institute of Science and Technology
Shin-Ik Kim: Korea Institute of Science and Technology
Hyung-Jin Choi: Korea Institute of Science and Technology
Junhyeon Jo: Ulsan National Institute of Science and Technology
Inseon Oh: Ulsan National Institute of Science and Technology
Jungmin Park: Ulsan National Institute of Science and Technology
Hosub Jin: Ulsan National Institute of Science and Technology
Hyun Cheol Koo: Korea Institute of Science and Technology
Byoung-Chul Min: Korea Institute of Science and Technology
Seokmin Hong: Korea Institute of Science and Technology
Hyun-Woo Lee: Pohang University of Science and Technology
Seung-Hyub Baek: Korea Institute of Science and Technology
Jung-Woo Yoo: Ulsan National Institute of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-12466-1

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