Giant thermoelectric Seebeck coefficient of a two-dimensional electron gas in SrTiO3

Ohta, Hiromichi; Kim, Sung Wng; Mune, Yoriko; Mizoguchi, Teruyasu; Nomura, Kenji; Ohta, Shingo; Nomura, Takashi; Nakanishi, Yuki; Ikuhara, Yuichi; Hirano, Masahiro; Hosono, Hideo; Koumoto, Kunihito

doi:10.1038/nmat1821

Cited by 944 publications

(764 citation statements)

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“…The experimental discovery of unusually large thermopower outputs from superlattices and two-dimensional electron gases in SrTiO 3 [7,8] spurred substantial research efforts into SrTiO 3 superlattices [9,10] and heterostructures [11][12][13] for thermoelectric applications. For example, a superlattice composed of one unit cell (uc) of SrTi 0.8 Nb 0.2 O 3 and 10 uc of SrTiO 3 exhibits a giant thermopower, most likely due to an electron confinement effect.…”

Section: Pulsed Laser Depositionmentioning

confidence: 99%

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Fabrication, Characterization, and Modulation of Functional Nanolayers

Ohta

Hiramatsu

2018

Nanoinformatics

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Regions of a few nanometers at the surface or interface of a material exhibit various functional properties, which differ from those of the bulk because the electrons and/or ions receive different potentials due to the incoherent atomic arrangement. High-quality epitaxial films of functional materials called "nanolayers" are important to utilize such functional properties. However, fabrication of high-quality nanolayers of complex materials with complicated crystal structures is usually challenging due to the difference in the thermochemical properties of the constituents. In this chapter, epitaxial growth techniques, especially "reactive solid-phase epitaxy" of functional oxides and chalcogenides, are reviewed based on the authors' efforts. Additionally, this chapter reviews several modulation methods of optical, electrical, and magnetic properties of functional oxide nanolayers.

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Section: Pulsed Laser Depositionmentioning

confidence: 99%

“…These results provide a foundation for further research to improve the thermoelectric performance of SrTi 1−x Nb x O 3 . [7]. The x dependence of S 2 ⋅ σ is shown in the inset.…”

Section: Pulsed Laser Depositionmentioning

confidence: 99%

Fabrication, Characterization, and Modulation of Functional Nanolayers

Ohta

Hiramatsu

2018

Nanoinformatics

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“…2 made of p-and n-type semiconductors for upper and lower parts will have opposite pβ in those parts leading to a device that can generate electrical power from a rotating magnetic field in accordance with Eqs. (3).…”

Section: Magnetocaloritronic Coolingmentioning

confidence: 99%

“…These latter machines are operating in the space of the conjugate variables (H,M). At nanoscale, however, one might need to rely on different principles and thermoelectric cooling and power generation appear to be very promising [2,3]. In particular, large values of the thermoelectric figure of merit have recently been suggested for molecular junctions [4].…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloritronic nanomachines

Kovalev

Tserkovnyak

2010

Solid State Communications

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We introduce and study a magnetocaloritronic circuit element based on a domain wall that can move under applied voltage, magnetic field and temperature gradient. We draw analogies between the Carnot machines and possible devices employing such circuit element. We further point out the parallels between the operational principles of thermoelectric and magnetocaloritronic cooling and power generation and also introduce a magnetocaloritronic figure of merit. Even though the magnetocaloritronic figure of merit turns out to be very small for transition-metal based magnets, we speculate that larger numbers may be expected in ferromagnetic insulators.

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“…two-dimensional gases [5,6]. The fact that interfaces have different properties from the bulk is a consequence of the fact that they have different atomic structures from the bulk.…”

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confidence: 99%

Atomic-Scale Nanostructures by Advanced Electron Microscopy and Informatics

et al. 2018

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Interfaces dramatically affect the properties of materials because their atomic configurations often differ from the bulk material. A determination of the atomic structure of the interface is, therefore, one of the most significant tasks in materials research. Electron microscopy and theoretical calculations have been effectively used to accomplish this important task. In addition, an informatics approach has recently been combined with theoretical calculations to efficiently determine the atomic structures of interfaces. This chapter introduces the determination of interface structures using an informatics approach (Bayesian optimization and virtual screening) along with advanced electron microscopy. In the informatics approach, calculation acceleration on the order of 10 6 can be achieved. Determination of the interface structure with resolution better than ∼45 pm is now possible using advanced electron microscopy. In this way, nanostructures at grain boundaries and heterointerfaces can be qualified. We will introduce these state of the art methods to investigate nanostructures.

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Giant thermoelectric Seebeck coefficient of a two-dimensional electron gas in SrTiO3

Cited by 944 publications

References 22 publications

Fabrication, Characterization, and Modulation of Functional Nanolayers

Fabrication, Characterization, and Modulation of Functional Nanolayers

Magnetocaloritronic nanomachines

Atomic-Scale Nanostructures by Advanced Electron Microscopy and Informatics

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