Experimental and computational study of zero dimensional metallic behavior at the LaLuO3/SrTiO3 interface

Pini Shekhter; Cecile Uzan-Saguy; Jürgen Schubert; Yaron Amouyal; Moshe Eizenberg

doi:10.1116/1.4943570

Experimental and computational study of zero dimensional metallic behavior at the LaLuO₃/SrTiO₃ interface

Pini Shekhter, Cecile Uzan-Saguy, Jürgen Schubert, Yaron Amouyal, Moshe Eizenberg

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

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Abstract

One of the observed and reported phenomena in heterogeneous interfaces of perovskite oxides is the presence of a two dimensional electron gas (2DEG). In this study, the imperfect interface that is formed between LaLuO₃ and SrTiO₃ was studied. It was found using x ray diffraction pole figure that LaLuO₃ is deposited on SrTiO₃ in a two-domain structure with alternately charged layers parallel to the surface. First-principles calculations reveal that even though the lattices of the two materials do not match, an increase of the total potential is found at the interface between the two lattices. Due to this increased potential, electrons are drawn to the interface; since the interface is not perfectly epitaxial, 2DEG is not formed and instead semicontinuous 0D metallic segments probed by scanning tunneling microscopy and spectroscopy are spread along the interface on the LaLuO₃ side.

Original language	English
Article number	021204
Journal	Journal of Vacuum Science and Technology B
Volume	34
Issue number	2
DOIs	https://doi.org/10.1116/1.4943570
State	Published - 1 Mar 2016
Externally published	Yes

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abstract = "One of the observed and reported phenomena in heterogeneous interfaces of perovskite oxides is the presence of a two dimensional electron gas (2DEG). In this study, the imperfect interface that is formed between LaLuO3 and SrTiO3 was studied. It was found using x ray diffraction pole figure that LaLuO3 is deposited on SrTiO3 in a two-domain structure with alternately charged layers parallel to the surface. First-principles calculations reveal that even though the lattices of the two materials do not match, an increase of the total potential is found at the interface between the two lattices. Due to this increased potential, electrons are drawn to the interface; since the interface is not perfectly epitaxial, 2DEG is not formed and instead semicontinuous 0D metallic segments probed by scanning tunneling microscopy and spectroscopy are spread along the interface on the LaLuO3 side.",

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AU - Shekhter, Pini

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AU - Amouyal, Yaron

AU - Eizenberg, Moshe

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AB - One of the observed and reported phenomena in heterogeneous interfaces of perovskite oxides is the presence of a two dimensional electron gas (2DEG). In this study, the imperfect interface that is formed between LaLuO3 and SrTiO3 was studied. It was found using x ray diffraction pole figure that LaLuO3 is deposited on SrTiO3 in a two-domain structure with alternately charged layers parallel to the surface. First-principles calculations reveal that even though the lattices of the two materials do not match, an increase of the total potential is found at the interface between the two lattices. Due to this increased potential, electrons are drawn to the interface; since the interface is not perfectly epitaxial, 2DEG is not formed and instead semicontinuous 0D metallic segments probed by scanning tunneling microscopy and spectroscopy are spread along the interface on the LaLuO3 side.

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Experimental and computational study of zero dimensional metallic behavior at the LaLuO₃/SrTiO₃ interface

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