Interface transport properties in ion-gated nano-sheets

Ye, Justin; Zhang, Y. J.; Kasahara, Yuichi; Iwasa, Yoshihiro

doi:10.1140/epjst/e2013-01914-0

Cited by 10 publications

(10 citation statements)

References 71 publications

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“…We have found that a field strength of about 1.5 VÅ −1 is sufficient for the semiconductor-metal transition. This electric field strength can be achieved experimentally using, e.g., ionic liquid gating [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Transition-metal dichalcogenide bilayers: Switching materials for spintronic and valleytronic applications

et al. 2014

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We report that an external electric field applied normal to bilayers of transition-metal dichalcogenides T X 2 (T = Mo, W, X = S, Se) creates significant spin-orbit splittings and reduces the electronic band gap linearly with the field strength. Contrary to the T X 2 monolayers, spin-orbit splittings and valley polarization are absent in bilayers due to the presence of inversion symmetry. This symmetry can be broken by an electric field, and the spin-orbit splittings in the valence band quickly reach values similar to those in the monolayers (145 meV for MoS 2 , . . . , 418 meV for WSe 2 ) at saturation fields less than 500 mVÅ −1 . The band gap closure results in a semiconductor-metal transition at field strength between 1.25 (WX 2 ) and 1.50 (MoX 2 ) VÅ −1 . Thus, by using a gate voltage, the spin polarization can be switched on and off in T X 2 bilayers, thus activating them for spintronic and valleytronic applications.

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Section: Introductionmentioning

confidence: 99%

“…ionic liquid gating. [22][23][24] II. METHODS All calculations were carried out using density-functional theory (DFT) with the PBE 25 exchange-correlation functional, with added London dispersion corrections as proposed by Grimme, 26 and with Becke and Johnson damping (BJ-damping) as implemented in the ADF/BAND package.…”

Section: Introductionmentioning

confidence: 99%

Transition-metal dichalcogenide bilayers: Switching materials for spintronic and valleytronic applications

et al. 2014

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“…Electrolyte gating of HTS cuprates was pioneered in the nineties by McDevitt and coworkers 9 10 11 . After being dormant for over a decade, the field has experienced a great renaissance in recent years, and apart from cuprates 8 12 it has been applied to various other complex oxides 13 14 15 16 as well as other correlated electron materials 17 18 19 20 21 . Changes in the free carrier concentrations have been observed 22 as large as 8 × 10 14 cm −2 - an order of magnitude more than what is obtainable using solid dielectrics.…”

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confidence: 99%

Oxygen Displacement in Cuprates under Ionic Liquid Field-Effect Gating

Dubuis

Yacoby

Zhou

et al. 2016

Sci Rep

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We studied structural changes in a 5 unit cell thick La1.96Sr0.04CuO4 film, epitaxially grown on a LaSrAlO4 substrate with a single unit cell buffer layer, when ultra-high electric fields were induced in the film by applying a gate voltage between the film (ground) and an ionic liquid in contact with it. Measuring the diffraction intensity along the substrate-defined Bragg rods and analyzing the results using a phase retrieval method we obtained the three-dimensional electron density in the film, buffer layer, and topmost atomic layers of the substrate under different applied gate voltages. The main structural observations were: (i) there were no structural changes when the voltage was negative, holes were injected into the film making it more metallic and screening the electric field; (ii) when the voltage was positive, the film was depleted of holes becoming more insulating, the electric field extended throughout the film, the partial surface monolayer became disordered, and equatorial oxygen atoms were displaced towards the surface; (iii) the changes in surface disorder and the oxygen displacements were both reversed when a negative voltage was applied; and (iv) the c-axis lattice constant of the film did not change in spite of the displacement of equatorial oxygen atoms.

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“…Recently, ion transport in nano‐scale materials has been of interest because of their unique physical and chemical properties, which differ quite noticeably from those of the bulk material. For example, nano‐sheets and self‐assembled molecular nano‐channels showed outstanding ion transport properties . Among these nanomaterials, nanofibers are of particular interest as effective ion transport materials due to their intrinsic characteristics, such as the nano‐size effect based on fiber diameter and the super specific surface area effect.…”

Section: Introductionmentioning

confidence: 99%

Anion conductive polymer nanofiber composite membrane: effects of nanofibers on polymer electrolyte characteristics

Watanabe

Tanaka

Kawakami

2016

Polymer International

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Polymer composite membranes composed of anion conductive polymer nanofiber mats and the corresponding polymer matrix were prepared and characterized for future alkaline fuel cells. In this paper, electrospinning was attempted to fabricate anion conductive nanofiber mats. The anion conductivity of the composite membrane was higher than the corresponding membrane without nanofibers under all conditions due to outstanding anion conductive characteristics of the nanofibers. In addition, because of the rigid and anisotropic structure of the nanofibers, membrane stabilities such as reductive degradation resistance and mechanical strength were very much improved. The gas permeability and excessive hydration swelling that will degrade fuel cells after long-term operation were suppressed in the nanofiber composite membrane. These results indicated that excellent properties of the anion conductive nanofibers were demonstrated even in the composite membrane, leading to the potential application of anion conductive nanofibers in future fuel cells.

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Interface transport properties in ion-gated nano-sheets

Cited by 10 publications

References 71 publications

Transition-metal dichalcogenide bilayers: Switching materials for spintronic and valleytronic applications

Transition-metal dichalcogenide bilayers: Switching materials for spintronic and valleytronic applications

Oxygen Displacement in Cuprates under Ionic Liquid Field-Effect Gating

Anion conductive polymer nanofiber composite membrane: effects of nanofibers on polymer electrolyte characteristics

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