Coexistence of two-dimensional and three-dimensional Shubnikov-de Haas oscillations in Ar+-irradiated KTaO3

S. Harashima; C. Bell; M. Kim; T. Yajima; Y. Hikita; H. Y. Hwang; Chris Bell

doi:10.1103/PhysRevB.88.085102

Coexistence of two-dimensional and three-dimensional Shubnikov-de Haas oscillations in Ar+-irradiated KTaO3

S. Harashima^*, C. Bell, M. Kim, T. Yajima, Y. Hikita, H. Y. Hwang, Chris Bell

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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Abstract

We report electron doping in the surface vicinity of KTaO3 by inducing oxygen vacancies via Ar+ irradiation. The doped electrons have high mobility (>10(4) cm(2)/V s) at low temperatures, and exhibit Shubnikov-de Haas oscillations with both two- and three-dimensional components. A disparity of the extracted in-plane effective mass, compared to the bulk values, suggests mixing of the orbital characters. Our observations demonstrate that Ar+ irradiation serves as a flexible tool to study low-dimensional quantum transport in 5d semiconducting oxides.

Original language	English
Article number	085102
Number of pages	7
Journal	Physical Review B: Condensed Matter and Materials Physics
Volume	88
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.88.085102
Publication status	Published - 2 Aug 2013

Keywords

ELECTRON-GAS
SRTIO3
SUPERCONDUCTIVITY
SURFACE
FILMS

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@article{cc08ed54a1974b1ab453604a85741efa,

title = "Coexistence of two-dimensional and three-dimensional Shubnikov-de Haas oscillations in Ar+-irradiated KTaO3",

abstract = "We report electron doping in the surface vicinity of KTaO3 by inducing oxygen vacancies via Ar+ irradiation. The doped electrons have high mobility (>10(4) cm(2)/V s) at low temperatures, and exhibit Shubnikov-de Haas oscillations with both two- and three-dimensional components. A disparity of the extracted in-plane effective mass, compared to the bulk values, suggests mixing of the orbital characters. Our observations demonstrate that Ar+ irradiation serves as a flexible tool to study low-dimensional quantum transport in 5d semiconducting oxides.",

keywords = "ELECTRON-GAS, SRTIO3, SUPERCONDUCTIVITY, SURFACE, FILMS",

author = "S. Harashima and C. Bell and M. Kim and T. Yajima and Y. Hikita and Hwang, \{H. Y.\} and Chris Bell",

year = "2013",

month = aug,

day = "2",

doi = "10.1103/PhysRevB.88.085102",

language = "English",

volume = "88",

journal = "Physical Review B: Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society (APS)",

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TY - JOUR

T1 - Coexistence of two-dimensional and three-dimensional Shubnikov-de Haas oscillations in Ar+-irradiated KTaO3

AU - Harashima, S.

AU - Bell, C.

AU - Kim, M.

AU - Yajima, T.

AU - Hikita, Y.

AU - Hwang, H. Y.

AU - Bell, Chris

PY - 2013/8/2

Y1 - 2013/8/2

N2 - We report electron doping in the surface vicinity of KTaO3 by inducing oxygen vacancies via Ar+ irradiation. The doped electrons have high mobility (>10(4) cm(2)/V s) at low temperatures, and exhibit Shubnikov-de Haas oscillations with both two- and three-dimensional components. A disparity of the extracted in-plane effective mass, compared to the bulk values, suggests mixing of the orbital characters. Our observations demonstrate that Ar+ irradiation serves as a flexible tool to study low-dimensional quantum transport in 5d semiconducting oxides.

AB - We report electron doping in the surface vicinity of KTaO3 by inducing oxygen vacancies via Ar+ irradiation. The doped electrons have high mobility (>10(4) cm(2)/V s) at low temperatures, and exhibit Shubnikov-de Haas oscillations with both two- and three-dimensional components. A disparity of the extracted in-plane effective mass, compared to the bulk values, suggests mixing of the orbital characters. Our observations demonstrate that Ar+ irradiation serves as a flexible tool to study low-dimensional quantum transport in 5d semiconducting oxides.

KW - ELECTRON-GAS

KW - SRTIO3

KW - SUPERCONDUCTIVITY

KW - SURFACE

KW - FILMS

U2 - 10.1103/PhysRevB.88.085102

DO - 10.1103/PhysRevB.88.085102

M3 - Article (Academic Journal)

SN - 1098-0121

VL - 88

JO - Physical Review B: Condensed Matter and Materials Physics

JF - Physical Review B: Condensed Matter and Materials Physics

IS - 8

M1 - 085102

ER -

Coexistence of two-dimensional and three-dimensional Shubnikov-de Haas oscillations in Ar+-irradiated KTaO3

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