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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…
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)…
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.…
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…