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Quantum capacitance
About: Quantum capacitance is a research topic. Over the lifetime, 954 publications have been published within this topic receiving 24165 citations.
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TL;DR: In this paper, a realistic, physics-based, practical RF circuit model for the AC impedance of a quantum point contact was developed, which includes the ohmic contacts, the on-chip?lead? resistance and kinetic inductance, and the QP contact impedance itself.
Abstract: We develop a realistic, physics based, practical RF circuit model for the AC impedance of a quantum point contact that includes the ohmic contacts, the on-chip ?lead? resistance and kinetic inductance, and the quantum point contact impedance itself. The kinetic inductance of the electrons in the ?leads? in series with the quantum point contact capacitance form a resonant tank circuit whose resonant frequency depends on the width of the quantum point contact channel. These measurements probe devices in the following qualitative regime: they are in the ballistic limit, and the measurement frequency is higher than the electron scattering frequency.
3 citations
Journal Article•
TL;DR: In this article, a novel structure for MOSFET like CNTFETs (MOSCNTs) is proposed, combining the advantages of both high and low dielectrics to improve output characteristics.
3 citations
TL;DR: In this paper, the electronic band structure, density of state (DOS), effective mass, quantum capacitance, transmission spectrum, and currentvoltage characteristic of armchair silicene nanoribbons (ASiNRs) doped with aluminum (Al) and phosphorus (P) atoms were studied.
3 citations
TL;DR: In this paper, a dual-gated FET configuration with an oxidized aluminum/aluminum top-gate was used to extract quantum capacitance from the measured total capacitance of graphene-based devices, which is well in agreement with a theory for ideal graphene except for near Dirac point.
Abstract: Quantum capacitance (Cq), which arises from the lack of charge carriers in low dimensional metallic materials, can be used to explore intrinsic properties of materials such as their density of states or residual carrier density when properly extracted. Here, Cq is extracted from the measured total capacitance of graphene-based devices using a dual-gated FET configuration with an oxidized aluminum/aluminum top-gate at room temperature. Acquired Cq is well in agreement with a theory for ideal graphene except for near Dirac point. The discrepancy in values near Dirac point is then adjusted by considering extra residual carrier density induced from charged impurities at finite temperature. The modified theory with residual carriers shows a great agreement with Cq measurements with the extracted residual carrier density of n* = 3.58 × 1011 cm−2.
3 citations
TL;DR: A graphene-based resonator-coupled waveguide supporting transverse-magnetic-polarized SPP modes is rigorously studied, which is capable of providing ultra-deep sub-wavelength mode confinement at the working frequency of 40 THz.
Abstract: Graphene is capable of supporting very slow waves due to sustaining surface plasmon polaritons (SPPs) at THz frequencies, whereas the metal counterpart can support such modes only at optical frequencies. In this paper, a graphene-based resonator-coupled waveguide supporting transverse-magnetic-polarized SPP modes is rigorously studied, which is capable of providing ultra-deep sub-wavelength mode confinement at the working frequency of 40 THz. First, graphene is described both electronically and electromagnetically, as in these regards, graphene’s quantum capacitance plays an important role, which is calculated via its DC characteristic. Since we aim to excite extremely slow waves in graphene waveguides, namely, SPP modes, it is necessary to contemplate a non-local conductivity model to characterize graphene. Furthermore, SPP modes create strong fields at the vicinity of a graphene strip in addition to high mode confinement, accentuating the importance of including nonlinear phenomena in characterizing the wave vector of SPP (WVP) modes. Furthermore, the WVP associated with a graphene waveguide is perturbed when placing another waveguide next to it. In this work, these phenomena are explored in detail to design a graphene-based resonator-coupled waveguide, which is superior to a single graphene-based waveguide in terms of confining propagating waves. Here, a comprehensive methodology is established for assessing miniaturized graphene devices, in which nonlinear, coupling, and spatial dispersion phenomena significantly affect their characteristics.
3 citations