Graphene Quantum Capacitors for High Frequency Tunable Analog Applications

Moldovan, Camelia; Vitale, Wolfgang A.; Sharma, Pankaj; Tamagnone, Michele; Mosig, J. R.; Ionescu, Adrian M.

doi:10.1021/acs.nanolett.5b05235

Cited by 20 publications

(18 citation statements)

References 43 publications

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“…reported a graphene quantum capacitor with optimized device structure and contact resistance, which was capable to operate at microwave frequencies. [ 23 ]…”

Section: Figurementioning

confidence: 99%

A Tunable Resonant Circuit Based on Graphene Quantum Capacitor

Zhang

Feng

et al. 2021

Adv Elect Materials

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Graphene has been widely investigated for electronic applications due to its outstanding physical properties, such as high carrier mobility, electrically tunable physical properties, and excellent compatibility with silicon technology. Here, taking advantage of the gate‐tunable physical properties of graphene, an LC resonant circuit based on graphene quantum capacitors is demonstrated, in which the resonant frequency can be electrically tuned from 1.45 to 1.73 MHz. At the same time, a quality factor ranging from 65 to 25 is achieved. The investigation suggests graphene is a promising material for signal processing applications.

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“…reported a graphene quantum capacitor with optimized device structure and contact resistance, which was capable to operate at microwave frequencies. [ 23 ]…”

Section: Figurementioning

confidence: 99%

A Tunable Resonant Circuit Based on Graphene Quantum Capacitor

Zhang

Feng

et al. 2021

Adv Elect Materials

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“…where ξ = Z/Z 0 . Equations (23) and (22) show that the parameter matrix is symmetric due to S 11 = S 22 and S 21 = S 12 . Fig.…”

Section: Frequency Modulation and Phase Modulation Simulation Andmentioning

confidence: 99%

“…Moreover, the strength of the interband transition in doped graphene is above 30A/W near 632nm optical wavelength [22], because doped graphene can generate more photoelectron-photohole pairs. The quantum capacitors of graphene are widely used in radio frequency (RF) [23] and electro-optics fields [24]. Researchers found that the photon-generated carrier concentration is positively correlated with optical energy [25], and the quantum capacitors of graphene layer (GL) increased with the increase of carrier concentration [26], [27].…”

Section: Introductionmentioning

confidence: 99%

Photo-Controlled Quantum Capacitors in Gated Graphene-Insulator-Graphene for Terahertz Frequency and Phase Modulations

Mao

Gu³

et al. 2020

IEEE J. Electron Devices Soc.

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This paper proposes a theoretical model of photo-controlled quantum capacitors in double-gated graphene-insulator-graphene (DGGIG) structure for terahertz (THz) frequency and phase modulations. In the model, the current-voltage characteristics of each segment of the DGGIG structure are controlled by different gate voltages. Using the different voltages, the DGGIG structure can be used to either generate plasma oscillation waves or shift phase in the terahertz band. Not only has the DGGIG structure various electrical properties, but also the optical properties are also excellent. Photoexcitation alters carrier concentration in DGGIG channel, and thus causes the change of the quantum capacitors. We propose a photo-controlled quantum capacitor model to quantify this phenomenon. The model shows that the quantum capacitors and photoexcitation have a sublinear dependence. An example of a device based on the model is given to describe the application of photo-controlled quantum capacitors in terahertz frequency and phase modulations. The modelled device shows that photoexcitation can change the frequency and phase of the plasma oscillation waves. INDEX TERMS Graphene-insulator-graphene, phase modulation, frequency modulation, plasma oscillation waves, photo-controlled quantum capacitors, terahertz.

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“…So, it should be safe to ignore both of these aspects in a precisely fabricated 2D layered structure, as long as it is void of defects and interfaces are atomically flat. It must be pointed out that these restrictions on fabrication can be experimentally challenging to achieve, and are studied thoroughly in a recent article to which the readers are being referred [67]. Also, the minimal quantum conductivity σ Q may ideally not be achievable due to the disorder effects and finite temperature [44].…”

Section: Charging Delaymentioning

confidence: 99%

Nonlinear graphene quantum capacitors for electro-optics

Khorasani

Koottandavida

2017

npj 2D Mater Appl

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Owing to its peculiar energy dispersion, the quantum capacitance property of graphene can be exploited in a two-dimensional layered capacitor configuration. Using graphene and boron nitride, respectively, as the electrodes and the insulating dielectric, a strongly nonlinear behavior at zero bias and small voltages is obtained. When the temperature is sufficiently low, the strong nonlinear interaction emerging from the quantum capacitance exhibits a diverse range of phenomena. The proposed structure could take over the functionalities of nonlinear elements in many cryogenic quantum systems, and in particular, quantum electrooptics. It is shown that ultrastrong coupling is easily reached with small number of pump photons at temperatures around 1 K and capacitor areas of the order of 1 μm 2 . A measure of anharmonicity is defined and as potential applications, a qubit design as well as schemes for non-reciprocal devices such as an electromagnetic frequency circulator are discussed. 20 Josephson junctions, despite their strong nonlinearity, normally operate at very small currents, which limits their maximum total photon occupation number. Moreover, they occasionally need to be biased by either a direct current (DC) magnetic field or electric current. As for the nonlinear capacitors, Graphene has been used in optomechanics as the mechanical element in the form of a drum capacitor.

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Graphene Quantum Capacitors for High Frequency Tunable Analog Applications

Cited by 20 publications

References 43 publications

A Tunable Resonant Circuit Based on Graphene Quantum Capacitor

A Tunable Resonant Circuit Based on Graphene Quantum Capacitor

Photo-Controlled Quantum Capacitors in Gated Graphene-Insulator-Graphene for Terahertz Frequency and Phase Modulations

Nonlinear graphene quantum capacitors for electro-optics

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