Resonant tunnelling in a quantum oxide superlattice

Woo Seok Choi; Sang A. Lee; Jeong Ho You; Suyoun Lee; Ho Nyung Lee

doi:10.1038/ncomms8424

Resonant tunnelling in a quantum oxide superlattice

Woo Seok Choi, Sang A. Lee, Jeong Ho You, Suyoun Lee, Ho Nyung Lee

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

Abstract

Resonant tunnelling is a quantum mechanical process that has long been attracting both scientific and technological attention owing to its intriguing underlying physics and unique applications for high-speed electronics. The materials system exhibiting resonant tunnelling, however, has been largely limited to the conventional semiconductors, partially due to their excellent crystalline quality. Here we show that a deliberately designed transition metal oxide superlattice exhibits a resonant tunnelling behaviour with a clear negative differential resistance. The tunnelling occurred through an atomically thin, lanthanum σ-doped SrTiO₃ layer, and the negative differential resistance was realized on top of the bipolar resistance switching typically observed for perovskite oxide junctions. This combined process resulted in an extremely large resistance ratio (∼10⁵) between the high and low-resistance states. The unprecedentedly large control found in atomically thin σ-doped oxide superlattices can open a door to novel oxide-based high-frequency logic devices.

Original language	English
Article number	7424
Journal	Nature Communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms8424
State	Published - Jun 24 2015

Funding

We thank In Rok Hwang, Taekjib Choi, Cheol Seong Hwang and Shinbuhm Lee for valuable discussions. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (W.S.C. and H.N.L.). The work on leakage current analysis was in part supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and future Planning (NRF-2014R1A2A2A01006478, W.S.C.) and by the Ministry of Education (NRF-2013R1A1A2057523, S.A.L.). S.L. was supported by KIST Institutional Program (Project No. 2E25440).

Funders	Funder number
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering
Ministry of Education	NRF-2013R1A1A2057523
Ministry of Science, ICT and Future Planning	NRF-2014R1A2A2A01006478
Korea Institute of Science and Technology	2E25440
National Research Foundation of Korea

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Resonant tunnelling in a quantum oxide superlattice

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