Creation of High Mobility Two-Dimensional Electron Gases via Strain Induced Polarization at an Otherwise Nonpolar Complex Oxide Interface

Yunzhong Chen; Felix Trier; Takeshi Kasama; Dennis Valbjørn Christensen; Nicolas Emile Bovet; Zoltan Imre Balogh; Li Han; Karl Tor Sune Thydén; Wei Zhang; Sadegh Yazdi; Poul Norby; Nini Pryds; Søren Linderoth

doi:10.1021/nl504622w

Creation of High Mobility Two-Dimensional Electron Gases via Strain Induced Polarization at an Otherwise Nonpolar Complex Oxide Interface

Yunzhong Chen, Felix Trier, Takeshi Kasama, Dennis Valbjørn Christensen, Nicolas Emile Bovet, Zoltan Imre Balogh, Li Han, Karl Tor Sune Thydén, Wei Zhang, Sadegh Yazdi, Poul Norby, Nini Pryds, Søren Linderoth

University of Copenhagen

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Abstract

The discovery of two-dimensional electron gases (2DEGs) in SrTiO₃-based heterostructures provides new opportunities for nanoelectronics. Herein, we create a new type of oxide 2DEG by the epitaxial-strain-induced polarization at an otherwise nonpolar perovskite-type interface of CaZrO₃/SrTiO₃. Remarkably, this heterointerface is atomically sharp and exhibits a high electron mobility exceeding 60 000 cm2 V⁻¹ s⁻¹ at low temperatures. The 2DEG carrier density exhibits a critical dependence on the film thickness, in good agreement with the polarization induced 2DEG scheme.

Original language	English
Journal	Nano Letters
Volume	15
Issue number	3
Pages (from-to)	1849–1854
ISSN	1530-6984
DOIs	https://doi.org/10.1021/nl504622w
Publication status	Published - 2015

Keywords

Complex oxide interfaces
Oxide electronics
Two-dimensional electron gases
Strain induced polarization

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Chen, Y., Trier, F., Kasama, T., Christensen, D. V., Bovet, N. E., Balogh, Z. I., Han, L., Thydén, K. T. S., Zhang, W., Yazdi, S., Norby, P., Pryds, N., & Linderoth, S. (2015). Creation of High Mobility Two-Dimensional Electron Gases via Strain Induced Polarization at an Otherwise Nonpolar Complex Oxide Interface. Nano Letters, 15(3), 1849–1854. https://doi.org/10.1021/nl504622w

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title = "Creation of High Mobility Two-Dimensional Electron Gases via Strain Induced Polarization at an Otherwise Nonpolar Complex Oxide Interface",

abstract = "The discovery of two-dimensional electron gases (2DEGs) in SrTiO3-based heterostructures provides new opportunities for nanoelectronics. Herein, we create a new type of oxide 2DEG by the epitaxial-strain-induced polarization at an otherwise nonpolar perovskite-type interface of CaZrO3/SrTiO3. Remarkably, this heterointerface is atomically sharp and exhibits a high electron mobility exceeding 60 000 cm2 V−1 s−1 at low temperatures. The 2DEG carrier density exhibits a critical dependence on the film thickness, in good agreement with the polarization induced 2DEG scheme.",

keywords = "Complex oxide interfaces, Oxide electronics, Two-dimensional electron gases, Strain induced polarization",

author = "Yunzhong Chen and Felix Trier and Takeshi Kasama and Christensen, {Dennis Valbj{\o}rn} and Bovet, {Nicolas Emile} and Balogh, {Zoltan Imre} and Li Han and Thyd{\'e}n, {Karl Tor Sune} and Wei Zhang and Sadegh Yazdi and Poul Norby and Nini Pryds and S{\o}ren Linderoth",

year = "2015",

doi = "10.1021/nl504622w",

language = "English",

volume = "15",

pages = "1849–1854",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "3",

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Chen, Y, Trier, F, Kasama, T, Christensen, DV, Bovet, NE, Balogh, ZI, Han, L, Thydén, KTS, Zhang, W, Yazdi, S, Norby, P , Pryds, N & Linderoth, S 2015, 'Creation of High Mobility Two-Dimensional Electron Gases via Strain Induced Polarization at an Otherwise Nonpolar Complex Oxide Interface', Nano Letters, vol. 15, no. 3, pp. 1849–1854. https://doi.org/10.1021/nl504622w

TY - JOUR

T1 - Creation of High Mobility Two-Dimensional Electron Gases via Strain Induced Polarization at an Otherwise Nonpolar Complex Oxide Interface

AU - Chen, Yunzhong

AU - Trier, Felix

AU - Kasama, Takeshi

AU - Christensen, Dennis Valbjørn

AU - Bovet, Nicolas Emile

AU - Balogh, Zoltan Imre

AU - Han, Li

AU - Thydén, Karl Tor Sune

AU - Zhang, Wei

AU - Yazdi, Sadegh

AU - Norby, Poul

AU - Pryds, Nini

AU - Linderoth, Søren

PY - 2015

Y1 - 2015

N2 - The discovery of two-dimensional electron gases (2DEGs) in SrTiO3-based heterostructures provides new opportunities for nanoelectronics. Herein, we create a new type of oxide 2DEG by the epitaxial-strain-induced polarization at an otherwise nonpolar perovskite-type interface of CaZrO3/SrTiO3. Remarkably, this heterointerface is atomically sharp and exhibits a high electron mobility exceeding 60 000 cm2 V−1 s−1 at low temperatures. The 2DEG carrier density exhibits a critical dependence on the film thickness, in good agreement with the polarization induced 2DEG scheme.

AB - The discovery of two-dimensional electron gases (2DEGs) in SrTiO3-based heterostructures provides new opportunities for nanoelectronics. Herein, we create a new type of oxide 2DEG by the epitaxial-strain-induced polarization at an otherwise nonpolar perovskite-type interface of CaZrO3/SrTiO3. Remarkably, this heterointerface is atomically sharp and exhibits a high electron mobility exceeding 60 000 cm2 V−1 s−1 at low temperatures. The 2DEG carrier density exhibits a critical dependence on the film thickness, in good agreement with the polarization induced 2DEG scheme.

KW - Complex oxide interfaces

KW - Oxide electronics

KW - Two-dimensional electron gases

KW - Strain induced polarization

U2 - 10.1021/nl504622w

DO - 10.1021/nl504622w

M3 - Journal article

C2 - 25692804

SN - 1530-6984

VL - 15

SP - 1849

EP - 1854

JO - Nano Letters

JF - Nano Letters

IS - 3

ER -

Creation of High Mobility Two-Dimensional Electron Gases via Strain Induced Polarization at an Otherwise Nonpolar Complex Oxide Interface

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