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Electrical Double Layer Capacitance in a Graphene …

Dielectric properties of a graphene-embedded Al 2 O 3 capacitor. Figure 2a shows a schematic diagram describing the formation of a double layer in Al 2 O 3 /graphene/Al 2 O 3, where the induced potential from space charge polarization is plotted in terms of the position in the diffuse layer.Negative and the positive charges are accumulated on the surface of graphene and Al 2 O 3, respectively.

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Electrical Double Layer Capacitance in a Graphene …

Dielectric properties of a graphene-embedded Al 2 O 3 capacitor. Figure 2a shows a schematic diagram describing the formation of a double layer in Al 2 O 3 /graphene/Al 2 O 3, where the induced potential from space charge polarization is plotted in terms of the position in the diffuse layer.Negative and the positive charges are accumulated on the surface of graphene and Al 2 O 3, respectively.

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US Patent for Double-layer graphene optical …

The double-layer graphene modulator used in the experiments described below was fabricated using embodiments described above. Specifically, in the fabrication of the double-layer graphene optical modulator, wet thermal oxidation and atomic layer deposition (ALD) were employed to form a 1 μm silica layer and a 20 nm thick Al 2 O 3 layer ...

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Graphene Double-Layer Capacitor with ac Line …

Electric double-layer capacitors (DLCs) can have high storage capacity, but their porous electrodes cause them to perform like resistors in filter circuits that remove ripple from rectified direct current. We have demonstrated efficient filtering of 120-hertz current with DLCs with electrodes made from vertically oriented graphene nanosheets grown directly on metal current collectors.

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Graphene Double-Layer Capacitor with ac Line …

Electric double-layer capacitors (DLCs) can have high storage capacity, but their porous electrodes cause them to perform like resistors in filter circuits that remove ripple from rectified direct current. We have demonstrated efficient filtering of 120-hertz current with DLCs with electrodes made from vertically oriented graphene nanosheets grown directly on metal current collectors.

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Molecular dynamics simulations of the electric double ...

2016-1-19 · Electrical double layer (EDL) capacitors based on recently emergent graphene materials have shown several folds performance improvement compared to conventional porous carbon materials, driving a wave of technology breakthrough in portable and renewable energy storage. Accordingly, much interest has been generated to pursue a comprehensive understanding of the fundamental yet elusive double ...

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Double-Layer Graphene Optical Modulator | Request …

Here we report a high-performance double-layer graphene optical modulator. By using two graphene layers and an oxide layer in between to form a p-oxide-n like junction, this modulator operates at ...

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Double-layer graphene on photonic crystal waveguide ...

The double-layer graphene modulator with strip waveguide achieves a MD of 0.16 dB/μm while keeping the bandwidth of 1 GHz . Using the amorphous silicon on top of the double-layer graphene will significantly increase the bandwidth up to 35 GHz since the two metal pads can be close to the a-Si ridge waveguide, but it still cannot reach a large ...

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Double-layer graphene and topological insulator thin …

Atomically flat thin films of topological insulator Bi{sub 2}Se{sub 3} have been grown on double-layer graphene formed on 6H-SiC(0001) substrate by molecular beam epitaxy. By a combined study of reflection high energy electron diffraction and scanning tunneling microscopy, we identified the Se-rich condition and temperature criterion for layer ...

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Double-layer graphene and topological insulator thin …

Atomically flat thin films of topological insulator Bi{sub 2}Se{sub 3} have been grown on double-layer graphene formed on 6H-SiC(0001) substrate by molecular beam epitaxy. By a combined study of reflection high energy electron diffraction and scanning tunneling microscopy, we identified the Se-rich condition and temperature criterion for layer ...

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Double-gated graphene-based devices - IOPscience

2009-9-30 · The ability to isolate and embed single- and multi-layer graphene in double-gated structures is paving the way to reveal the unique electronic properties of these systems –. Independent voltages applied to a nano-fabricated top gate and to the back gate offer the possibility to gain local control of the charge density and to impose locally a ...

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Double layer of graphene helps to control spin currents

This led Omar to use a double layer of graphene on the tungsten disulphide, based on the theory that electrons passing through the upper layer should 'feel' less of the metal atoms' influence.

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Double layer of graphene helps to control spin currents

This led Omar to use a double layer of graphene on the tungsten disulphide, based on the theory that electrons passing through the upper layer should 'feel' less of the metal atoms' influence.

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Double layer of graphene helps to control spin currents

Oct 17, 2019: Double layer of graphene helps to control spin currents (Nanowerk News) In order to make transistors that operate using the spin of electrons, rather than their charge, it is necessary to find a way of switching spin currents on and off.Furthermore, the lifetime of the spins should at least be equal to the time taken for these electrons to travel through a circuit.

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Double Layer of Graphene Helps to Control Spin …

Tungsten is a metal, and its atoms influence the electrons passing through the graphene, dissipating the spin currents. This led Omar to use a double layer of graphene on the tungsten disulphide, based on the theory that electrons passing through the upper layer should 'feel' less of the metal atoms' influence.

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Double layer of graphene helps to control spin …

2020-12-18 · This led Omar to use a double layer of graphene on the tungsten disulphide, based on the theory that electrons passing through the upper layer should 'feel' less of the metal atoms' influence. Omar also used another new technique, in which two different types of spin current are passed through the graphene. Spin is a magnetic moment that has a ...

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Double layer of graphene helps to control spin …

2020-12-18 · This led Omar to use a double layer of graphene on the tungsten disulphide, based on the theory that electrons passing through the upper layer should 'feel' less of the metal atoms' influence. Omar also used another new technique, in which two different types of spin current are passed through the graphene. Spin is a magnetic moment that has a ...

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Double Layer Energy Storage in Graphene - a Study ...

2020-8-18 · Title:Double Layer Energy Storage in Graphene - a Study VOLUME: 4 ISSUE: 3 Author(s):C.K. Subramaniam and T. Maiyalagan Affiliation:Materials Physics Division, School ...

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Graphene Double-Layer Capacitor with ac Line …

Electric double-layer capacitors (DLCs) can have high storage capacity, but their porous electrodes cause them to perform like resistors in filter circuits that remove ripple from rectified direct current. We have demonstrated efficient filtering of 120-hertz current with DLCs with electrodes made from vertically oriented graphene nanosheets grown directly on metal current collectors.

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Graphene Double-Layer Capacitor with ac Line …

Electric double-layer capacitors (DLCs) can have high storage capacity, but their porous electrodes cause them to perform like resistors in filter circuits that remove ripple from rectified direct current. We have demonstrated efficient filtering of 120-hertz current with DLCs with electrodes made from vertically oriented graphene nanosheets grown directly on metal current collectors.

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Design optimization of single and double layer …

2020-12-25 · In this paper we report on an electro-refractive modulator based on single or double-layer graphene on top of silicon waveguides. The graphene layers are biased to the transparency condition in order to achieve phase modulation with negligible amplitude modulation. By means of a detailed study of both the electrical and optical properties of graphene and silicon, as well as through ...

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(PDF) Double-layer graphene on photonic crystal …

The device is based on a planar structure with double-layer graphene, leading to the high modulation speed, up to 35 GHz through reduction of the total resistance, and capacitance (9 fF).

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Research Reveals Exotic Quantum States in Double …

2daysbefore · New York, NY—June 24, 2019—Researchers from Brown and Columbia Universities have demonstrated previously unknown states of matter that arise in double-layer stacks of graphene, a two-dimensional nanomaterial. These new states, known as the fractional quantum Hall effect, arise from the complex interactions of electrons both within and across graphene layers.

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Research Reveals Exotic Quantum States in Double …

2daysbefore · New York, NY—June 24, 2019—Researchers from Brown and Columbia Universities have demonstrated previously unknown states of matter that arise in double-layer stacks of graphene, a two-dimensional nanomaterial. These new states, known as the fractional quantum Hall effect, arise from the complex interactions of electrons both within and across graphene layers.

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Research reveals exotic quantum states in double …

A new type quasiparticle is discovered in graphene double-layer structure. This so-called composite fermion consists of one electron and two different types of magnetic flux, illustrated as blue ...