scholarly journals Noise diagnostics of graphene interconnects for atomic-scale electronics

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
László Pósa ◽  
Zoltán Balogh ◽  
Dávid Krisztián ◽  
Péter Balázs ◽  
Botond Sánta ◽  
...  
Keyword(s):  
Electrical Breakdown ◽  
Low Frequency ◽  
Building Blocks ◽  
Atomic Scale ◽  
High Yield ◽  
Frequency Noise ◽  
Two Dimensional ◽  
Electronic Circuits ◽  
Noise Diagnostics ◽  
Insight Into

AbstractGraphene nanogaps are considered as essential building blocks of two-dimensional electronic circuits, as they offer the possibility to interconnect a broad range of atomic-scale objects. Here we provide an insight into the microscopic processes taking place during the formation of graphene nanogaps through the detailed analysis of their low-frequency noise properties. Following the evolution of the noise level, we identify the fundamentally different regimes throughout the nanogap formation. By modeling the resistance and bias dependence of the noise, we resolve the major noise-generating processes: atomic-scale junction-width fluctuations in the nanojunction regime and sub-atomic gap-size fluctuations in the nanogap regime. As a milestone toward graphene-based atomic electronics, our results facilitate the automation of an optimized electrical breakdown protocol for high-yield graphene nanogap fabrication.

scholarly journals Tunable characteristics of low-frequency bandgaps in two-dimensional multivibrator phononic crystal plates under prestrain

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hai-Fei Zhu ◽  
Xiao-Wei Sun ◽  
Ting Song ◽  
Xiao-Dong Wen ◽  
Xi-Xuan Liu ◽  
...  
Keyword(s):  
Phononic Crystal ◽  
Real Life ◽  
Low Frequency ◽  
Acoustic Vibration ◽  
Crystal Plate ◽  
Frequency Noise ◽  
Two Dimensional ◽  
The Matrix ◽  
Noise Frequency ◽  
Realtime Control

AbstractIn view of the influence of variability of low-frequency noise frequency on noise prevention in real life, we present a novel two-dimensional tunable phononic crystal plate which is consisted of lead columns deposited in a silicone rubber plate with periodic holes and calculate its bandgap characteristics by finite element method. The low-frequency bandgap mechanism of the designed model is discussed simultaneously. Accordingly, the influence of geometric parameters of the phononic crystal plate on the bandgap characteristics is analyzed and the bandgap adjustability under prestretch strain is further studied. Results show that the new designed phononic crystal plate has lower bandgap starting frequency and wider bandwidth than the traditional single-sided structure, which is due to the coupling between the resonance mode of the scatterer and the long traveling wave in the matrix with the introduction of periodic holes. Applying prestretch strain to the matrix can realize active realtime control of low-frequency bandgap under slight deformation and broaden the low-frequency bandgap, which can be explained as the multiple bands tend to be flattened due to the localization degree of unit cell vibration increases with the rise of prestrain. The presented structure improves the realtime adjustability of sound isolation and vibration reduction frequency for phononic crystal in complex acoustic vibration environments.

Low frequency noise in two‐dimensional metal‐semiconductor field effect transistor

1996 ◽  
Vol 68 (22) ◽  
pp. 3138-3140 ◽  
Author(s):  
M. E. Levinshtein ◽  
S.‐L. Rumyantsev ◽  
G. S. Simin ◽  
H. Park ◽  
W. C. B. Peatman ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Low Frequency ◽  
Frequency Noise ◽  
Two Dimensional ◽  
Low Frequency Noise ◽  
Effect Transistor

Band structures in a two-dimensional phononic crystal with rotational multiple scatterers

2017 ◽  
Vol 31 (06) ◽  
pp. 1750038 ◽  
Author(s):  
Ailing Song ◽  
Xiaopeng Wang ◽  
Tianning Chen ◽  
Lele Wan
Keyword(s):  
Sound Pressure ◽  
Phononic Crystal ◽  
Low Frequency ◽  
Electrical Circuit ◽  
Frequency Noise ◽  
Transmission Spectra ◽  
Two Dimensional ◽  
Band Structures ◽  
Unit Cells ◽  
Circuit Analogy

In this paper, the acoustic wave propagation in a two-dimensional phononic crystal composed of rotational multiple scatterers is investigated. The dispersion relationships, the transmission spectra and the acoustic modes are calculated by using finite element method. In contrast to the system composed of square tubes, there exist a low-frequency resonant bandgap and two wide Bragg bandgaps in the proposed structure, and the transmission spectra coincide with band structures. Specially, the first bandgap is based on locally resonant mechanism, and the simulation results agree well with the results of electrical circuit analogy. Additionally, increasing the rotation angle can remarkably influence the band structures due to the transfer of sound pressure between the internal and external cavities in low-order modes, and the redistribution of sound pressure in high-order modes. Wider bandgaps are obtained in arrays composed of finite unit cells with different rotation angles. The analysis results provide a good reference for tuning and obtaining wide bandgaps, and hence exploring the potential applications of the proposed phononic crystal in low-frequency noise insulation.

Low frequency noise in two-dimensional lateral GaN/AlGaN Schottky diodes

2016 ◽  
Vol 109 (3) ◽  
pp. 033502 ◽  
Author(s):  
G. Cywiński ◽  
K. Szkudlarek ◽  
P. Kruszewski ◽  
I. Yahniuk ◽  
S. Yatsunenko ◽  
...  
Keyword(s):  
Schottky Diodes ◽  
Low Frequency ◽  
Frequency Noise ◽  
Two Dimensional ◽  
Low Frequency Noise

Textural and Acidic Properties of Mixed Alumina-Silica Oxides Prepared with Commercially Available Sols

1997 ◽  
Vol 497 ◽  
Author(s):  
Steven J. Monaco ◽  
Edmond I. Ko
Keyword(s):  
Particle Size ◽  
Mixed Oxides ◽  
Building Blocks ◽  
Particle Packing ◽  
Atomic Scale ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Acidic Properties ◽  
Fixed Composition ◽  
Insight Into

ABSTRACTIn this study we have used commercially available preformed sols as building blocks to systematically explore the effects of composition, particle size, and packing on the textural and acidic properties of alumina-silica. We have prepared single oxides and alumina-silica mixed oxides with varying Al:Si atomic ratios using commercial sols from Vista Chemical Co. (alumina) and Eka Chemicals, Inc. (silica). Simple particle packing models based on the structure and experimentally determined particle size distributions of the sols explain the textural and acidic properties of both the single and mixed oxides. Comparisons with aerogels prepared from alkoxides show that materials with different atomic-scale homogeneity can be obtained. This continuum of precursor sizes from monomer through colloid allows a measure of control over textural and acidic properties in the mixed oxides, even at a fixed composition. These results show that systematic studies using preformed sols add insight into the effect of preparation upon catalytic materials.

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