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Fabrication of uniformly doped graphene quantum Hall arrays with multiple quantized resistance outputs
Swapnil M. Mhatre, Ngoc Thanh Mai Tran, Heather M. Hill +7
In this work, limiting factors for developing metrologically useful arrays from epitaxial graphene on SiC are lifted with a combination of centimeter-scale, high-quality material g…
Diffraction Patterns of Apertures Shaped as National Borders
Albert F. Rigosi
How aesthetically pleasing is your country's diffraction pattern? This work summarizes the calculated and experimental Fraunhofer diffraction patterns obtained from using apertures…
Spectroscopic assessment of short-term nitric acid doping of epitaxial graphene
Ngoc Thanh Mai Tran, Swapnil M. Mhatre, Cristiane N. Santos +10
This work reports information on the transience of hole doping in epitaxial graphene devices when nitric acid is used as an adsorbent. Under vacuum conditions, desorption processes…
Timescales for Nitric Acid Desorption in Epitaxial Graphene Devices
Swapnil M. Mhatre, Ngoc Thanh Mai Tran, Heather M. Hill +6
This work reports the dynamics of transient hole doping in epitaxial graphene devices by using nitric acid as an adsorbent. The timescales associated with corresponding desorption…
Large-scale five- and seven-junction epitaxial graphene devices
Dinesh Patel, Martina Marzano, Chieh-I Liu +8
The utilization of multiple current terminals on millimeter-scale graphene p-n junction devices has enabled the measurement of many atypical, fractional multiples of the quantized…
Algorithms for determining resistances in quantum Hall annuli with p-n junctions
Chieh-I Liu, Dominick S. Scaletta, Dinesh K. Patel +4
Just a few of the promising applications of graphene Corbino pnJ devices include two-dimensional Dirac fermion microscopes, custom programmable quantized resistors, and mesoscopic…
Fabrication of quantum Hall p-n junction checkerboards
Dinesh K. Patel, Martina Marzano, Chieh-I Liu +4
Measurements of fractional multiples of the ν=2 plateau quantized Hall resistance (R_H {\approx} 12906 Ω) were enabled by the utilization of multiple current terminals on millimetr…
Expansion of Graphene-Based Device Technology for Resistance Metrology
Albert F. Rigosi
The field of Quantum Hall metrology had a strong start with the implemntation of GaAs-based devices, given that 2D materials systems provided access to interesting quantum phenomen…
Marking the Graphene Era in Disseminating the Redefined SI
Albert F. Rigosi
The history of quantum Hall standards stretches several decades and mostly begins with the use of GaAs given that 2D electron systems exhibit interesting quantum phenomena. At the…
Historical Context and Outlook of Quantum Hall Research for the Redefined SI
Albert F. Rigosi
To fully appreciate the impacts that the discovery of the quantum Hall effect had on electrical metrology, it may benefit the reader to cultivate a general understanding of the phe…
Quantum Hall Junction Dartboards Using Graphene Annuli
Chieh-I Liu, Dinesh K. Patel, Martina Marzano +3
The use of multiple current terminals on millimeter-scale graphene junction devices fabricated with Corbino geometries, or quantum Hall resistance dartboards, have enabled th…
Nonconventional Quantized Hall Resistances Obtained with Equilibration in Epitaxial Graphene Junctions
Albert F. Rigosi, Dinesh Patel, Martina Marzano +9
We have demonstrated the millimeter-scale fabrication of monolayer epitaxial graphene junction devices using simple ultraviolet photolithography, thereby significantly reduci…
Simulation of Graphene Nanoplatelets for NO and CO Gas Sensing at Room Temperature
Olasunbo Farinre, Swapnil M. Mhatre, Albert F. Rigosi +1
This work reports the modeling and simulation of gas sensors made from pristine graphene nanoplatelets (P-GnPs) using COMSOL Multiphysics software. The mass balance equation was so…
Algorithm for constructing customized quantized resistances in graphene junctions
Albert F. Rigosi, Martina Marzano, Antonio Levy +6
An algorithm is introduced for predicting quantized resistances in graphene p-n junction devices that utilize more than a single entry and exit point for electron flow. Depending o…
A Comprehensive Study on the Spectroscopic Characterization and Molecular Dynamics Simulation of Pristine and Functionalized Graphene Nanoplatelets for Gas Sensing Applications
Olasunbo Z. Farinre, Hawazin Alghamdi, Mathew L. Kelley +5
Graphene nanoplatelets (GnPs) are promising candidates for gas sensing applications because they have a high surface area to volume ratio, high conductivity, and a high temperature…
Review of Theoretical and Computational Methods for 2D Materials Exhibiting Charge Density Waves
Sugata Chowdhury, Heather M. Hill, Albert F. Rigosi +3
Two-dimensional (2D) materials that exhibit charge density waves (CDWs) have generated many research endeavors in the hopes of employing their exotic properties for various quantum…
Designs for programmable quantum resistance standards based on epitaxial graphene p-n junctions
Jiuning Hu, Albert F. Rigosi, Mattias Kruskopf +13
We report the fabrication and measurement of top gated epitaxial graphene p-n junctions where exfoliated hexagonal boron nitride (h-BN) is used as the gate dielectric. The four-ter…