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21 papers
Variable Electrical Responses in Epitaxial Graphene Nanoribbons
C. -C. Yeh, S. M. Mhatre, N. T. M. Tran +7
We have demonstrated the fabrication of both armchair and zigzag epitaxial graphene nanoribbon (GNR) devices on 4H-SiC using a polymer-assisted sublimation growth method. The pheno…
Star-Mesh Quantized Hall Array Resistance Devices
Dean G. Jarrett, Ching-Chen Yeh, Shamith U. Payagala +10
Advances in the development of graphene-based technology have enabled improvements in DC resistance metrology. Devices made from epitaxially grown graphene have replaced the GaAs-b…
Quantum Entropic Effects in the Liquid Viscosities of Hydrogen, Deuterium, and Neon
Ian Bell, Jacob W. Leachman, Albert F. Rigosi +1
The extremely low temperatures have limited the availability and accuracy of experimental thermophysical property measurements for cryogens, particularly transport properties. Trad…
Optical Signatures of Strain Differences in Epitaxial Graphene Nanoribbons
Heather M. Hill, Ching-Chen Yeh, Swapnil M. Mhatre +6
We demonstrate the preparation of both armchair and zigzag epitaxial graphene nanoribbons (GNRs) on 4H-SiC using a polymer-assisted, sublimation growth method. Historically, the pr…
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…
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…
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…
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…
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…
Analysis of Raman and Ellipsometric Responses of NbWSe alloys
Albert F. Rigosi, Heather M. Hill, Sergiy Krylyuk +4
The growth of transition metal dichalcogenide (TMDC) alloys provides an opportunity to experimentally access information elucidating how optical properties change with gradual subs…
Bonding characteristics of the interfacial buffer layer in epitaxial graphene via density functional theory
Alana Okullo, Heather M. Hill, Albert F. Rigosi +3
Monolayer epitaxial graphene is an appropriate candidate for a wide variety of electronic and optical applications. One advantage of growing graphene on the Si face of SiC is that…
Examining Experimental Raman Mode Behavior in Mono- and Bi-layer 2H-TaSe via Density Functional Theory
Sugata Chowdhury, Heather M. Hill, Albert F. Rigosi +5
Tantalum diselenide (TaSe) is a metallic transition metal dichalcogenide whose equilibrium structure and vibrational behavior strongly depends on temperature and thickness, i…
Influence of Dimensionality on the Charge Density Wave Phase of 2H-TaSe
Sugata Chowdhury, Albert F. Rigosi, Heather M. Hill +5
Metallic transition metal dichalcogenides like tantalum diselenide (TaSe) exhibit exciting behaviors at low temperatures, including the emergence of charge density wave (CDW)…
Coulomb engineering of the bandgap in 2D semiconductors
Archana Raja, Andrey Chaves, Jaeeun Yu +13
The ability to control the size of the electronic bandgap is an integral part of solid-state technology. Atomically-thin two-dimensional crystals offer a new approach for tuning th…
Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
Yilei Li, Alexey Chernikov, Xian Zhang +7
We report a determination of the complex in-plane dielectric function of monolayers of four transition metal dichalcogenides: MoS2, MoSe2, WS2 and WSe2, for photon energies from 1.…
Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
Yilei Li, Jonathan Ludwig, Tony Low +12
We have measured circularly polarized photoluminescence in monolayer MoSe2 under perpendicular magnetic fields up to 10 T. At low doping densities, the neutral and charged excitons…
Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
Alexey Chernikov, Timothy C. Berkelbach, Heather M. Hill +6
We have experimentally determined the energies of the ground and first four excited excitonic states of the fundamental optical transition in monolayer WS2, a model system for the…