Feld-induced modulation of two-dimensional electron gas at LaAlO3/SrTiO3 interface by polar distortion of LaAlO3

Jinsol Seo, Hyungwoo Lee, Kitae Eom, Jinho Byun, Taewon Min, Jaekwang Lee, Kyoungjun Lee, Chang-Beom Eom and Sang Ho Oh ()
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Jinsol Seo: Korea Institute of Energy Technology (KENTECH)
Hyungwoo Lee: University of Wisconsin-Madison
Kitae Eom: University of Wisconsin-Madison
Jinho Byun: Korea Institute of Energy Technology (KENTECH)
Taewon Min: Pusan National University
Jaekwang Lee: Pusan National University
Kyoungjun Lee: University of Wisconsin-Madison
Chang-Beom Eom: University of Wisconsin-Madison
Sang Ho Oh: Korea Institute of Energy Technology (KENTECH)

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Since the discovery of two-dimensional electron gas at the LaAlO3/SrTiO3 interface, its intriguing physical properties have garnered significant interests for device applications. Yet, understanding its response to electrical stimuli remains incomplete. Our in-situ transmission electron microscopy analysis of a LaAlO3/SrTiO3 two-dimensional electron gas device under electrical bias reveals key insights. Inline electron holography visualized the field-induced modulation of two-dimensional electron gas at the interface, while electron energy loss spectroscopy showed negligible electromigration of oxygen vacancies. Instead, atom-resolved imaging indicated that electric fields trigger polar distortion in the LaAlO3 layer, affecting two-dimensional electron gas modulation. This study refutes the previously hypothesized role of oxygen vacancies, underscoring the lattice flexibility of LaAlO3 and its varied polar distortions under electric fields as central to two-dimensional electron gas dynamics. These findings open pathways for advanced oxide nanoelectronics, exploiting the interplay of polar and nonpolar distortions in LaAlO3.

Date: 2024
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DOI: 10.1038/s41467-024-48946-2

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