Quantum electron transport through SrTiO3: Effects of dopants on conductance channel

Zhongchang Wang; Susumu Tsukimoto; Mitsuhiro Saito; Yuichi Ikuhara

doi:10.1063/1.3158615

Quantum electron transport through SrTiO₃: Effects of dopants on conductance channel

Zhongchang Wang, Susumu Tsukimoto, Mitsuhiro Saito, Yuichi Ikuhara

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

6 Citations (Scopus)

Abstract

Combining nonequilibrium Green's function technique with density functional theory, electronic structure and quantum transport of Pt- SrTiO₃ -Pt heterostructures are investigated with special focus on effects of dopants. We find that intrinsically closed conductance channel in SrTiO₃ opens after doping substitutional atoms of higher valency for Sr or Ti, resulting in enhancement in electron transmission at Fermi level and drastic increase in current with bias. The switch of channel is suggested to be due to the redistribution of density of states on orbitals of channel atoms.

Original language	English
Article number	252103
Journal	Applied Physics Letters
Volume	94
Issue number	25
DOIs	https://doi.org/10.1063/1.3158615
Publication status	Published - 2009

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Quantum electron transport through SrTiO3: Effects of dopants on conductance channel",

abstract = "Combining nonequilibrium Green's function technique with density functional theory, electronic structure and quantum transport of Pt- SrTiO3 -Pt heterostructures are investigated with special focus on effects of dopants. We find that intrinsically closed conductance channel in SrTiO3 opens after doping substitutional atoms of higher valency for Sr or Ti, resulting in enhancement in electron transmission at Fermi level and drastic increase in current with bias. The switch of channel is suggested to be due to the redistribution of density of states on orbitals of channel atoms.",

author = "Zhongchang Wang and Susumu Tsukimoto and Mitsuhiro Saito and Yuichi Ikuhara",

note = "Funding Information: We thank M. Tsukada for allowing our use of computational resources. This work was supported in part by the grant “Atomic Scale Modification (Grant No. 474)” from MEXT of Japan.",

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T1 - Quantum electron transport through SrTiO3

T2 - Effects of dopants on conductance channel

AU - Wang, Zhongchang

AU - Tsukimoto, Susumu

AU - Saito, Mitsuhiro

AU - Ikuhara, Yuichi

N1 - Funding Information: We thank M. Tsukada for allowing our use of computational resources. This work was supported in part by the grant “Atomic Scale Modification (Grant No. 474)” from MEXT of Japan.

PY - 2009

Y1 - 2009

N2 - Combining nonequilibrium Green's function technique with density functional theory, electronic structure and quantum transport of Pt- SrTiO3 -Pt heterostructures are investigated with special focus on effects of dopants. We find that intrinsically closed conductance channel in SrTiO3 opens after doping substitutional atoms of higher valency for Sr or Ti, resulting in enhancement in electron transmission at Fermi level and drastic increase in current with bias. The switch of channel is suggested to be due to the redistribution of density of states on orbitals of channel atoms.

AB - Combining nonequilibrium Green's function technique with density functional theory, electronic structure and quantum transport of Pt- SrTiO3 -Pt heterostructures are investigated with special focus on effects of dopants. We find that intrinsically closed conductance channel in SrTiO3 opens after doping substitutional atoms of higher valency for Sr or Ti, resulting in enhancement in electron transmission at Fermi level and drastic increase in current with bias. The switch of channel is suggested to be due to the redistribution of density of states on orbitals of channel atoms.

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Quantum electron transport through SrTiO₃: Effects of dopants on conductance channel

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