Dielectric enhancement of BaTiO3/SrTiO3 superlattices with embedded Ni nanocrystals

Xiong, Zhengwei; Sun, Weiguo; Wang, Xuemin; Jiang, Fan; Wu, Weidong

doi:10.1016/j.jallcom.2011.09.103

Cited by 11 publications

(3 citation statements)

References 18 publications

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“…Note that the key experimental parameters are shown elsewhere. 28 The deposition processes involved several pulses on the Ni target in ultrahigh-vacuum, followed by the epitaxial growth of BTO layers. Before the deposition, the substrate was in situ annealed three hours at 973 K in order to remove surface contamination.…”

Section: Methodsmentioning

confidence: 99%

Room-temperature resonant quantum tunneling transport of macroscopic systems

et al. 2014

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A self-assembled quantum dots array (QDA) is a low dimensional electron system applied to various quantum devices. This QDA, if embedded in a single crystal matrix, could be advantageous for quantum information science and technology. However, the quantum tunneling effect has been difficult to observe around room temperature thus far, because it occurs in a microcosmic and low temperature condition. Herein, we show a designed a quasi-periodic Ni QDA embedded in a single crystal BaTiO3 matrix and demonstrate novel quantum resonant tunneling transport properties around room-temperature according to theoretical calculation and experiments. The quantum tunneling process could be effectively modulated by changing the Ni QDA concentration. The major reason was that an applied weak electric field (∼10(2) V cm(-1)) could be enhanced by three orders of magnitude (∼10(5) V cm(-1)) between the Ni QDA because of the higher permittivity of BaTiO3 and the 'hot spots' of the Ni QDA. Compared with the pure BaTiO3 films, the samples with embedded Ni QDA displayed a stepped conductivity and temperature (σ-T curves) construction.

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Section: Methodsmentioning

confidence: 99%

Room-temperature resonant quantum tunneling transport of macroscopic systems

et al. 2014

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“…Especially for the fabrication of quantum dot (QD) structures, the self-organized growth is greatly successful in semiconductor devices, such as InGaAs on GaAs [10], AlN on GaN [12]. Wu et al have successfully fabricated Co:BTO and Ni:BTO composite film using self-organized method [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Controllable Growth of Ni Nanocrystals Embedded in BaTiO<sub>3</sub>/SrTiO<sub>3</sub> Superlattices

Xiong¹,

Wu²

2013

MNSMS

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BaTiO 3 /SrTiO 3 superlattices with embedded Ni nanocrystals (NCs) have been grown on SrTiO 3 (001) substrate using laser molecular beam epitaxy (L-MBE). In situ reflection high -energy electron diffraction (RHEED) was employed to investigate the process of lattice strain in the self-organization of Ni NCs and the epitaxial growth of BaTiO 3 /SrTiO 3 superlattices. The results indicated that the strain from large lattice mismatch drove the self-organization of Ni NCs. Also, the layer-by-layer growth of BaTiO 3 /SrTiO 3 superlattices and the island growth of Ni NCs were controllable accurately. The fine alternation of the two processes would provide a possible route to engineer controllably the nanocomposite microstructure.

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“…Metal quantum dots embedded in dielectric matrices exhibit promising nonlinear optical properties, particularly in the enhancement of the optical Kerr susceptibility [10]. Among them, noble metal quantum dots embedded in dielectric matrices has triggered more and more interests of researchers due to their large third-order nonlinear susceptibility [11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and third-order nonlinear optical properties of copper quantum dots embedded in sodium borosilicate glass

Zhong

Xiang

Zhao

et al. 2012

Journal of Alloys and Compounds

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Dielectric enhancement of BaTiO3/SrTiO3 superlattices with embedded Ni nanocrystals

Cited by 11 publications

References 18 publications

Room-temperature resonant quantum tunneling transport of macroscopic systems

Room-temperature resonant quantum tunneling transport of macroscopic systems

Controllable Growth of Ni Nanocrystals Embedded in BaTiO<sub>3</sub>/SrTiO<sub>3</sub> Superlattices

Synthesis, characterization, and third-order nonlinear optical properties of copper quantum dots embedded in sodium borosilicate glass

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Dielectric enhancement of BaTiO3/SrTiO3 superlattices with embedded Ni nanocrystals

Cited by 11 publications

References 18 publications

Room-temperature resonant quantum tunneling transport of macroscopic systems

Room-temperature resonant quantum tunneling transport of macroscopic systems

Controllable Growth of Ni Nanocrystals Embedded in BaTiO&lt;sub&gt;3&lt;/sub&gt;/SrTiO&lt;sub&gt;3&lt;/sub&gt; Superlattices

Synthesis, characterization, and third-order nonlinear optical properties of copper quantum dots embedded in sodium borosilicate glass

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Controllable Growth of Ni Nanocrystals Embedded in BaTiO<sub>3</sub>/SrTiO<sub>3</sub> Superlattices