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Ramal Afrose

As seen in: Physical Review B
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Articles by Ramal Afrose

Nonmonotonic temperature dependence of electron viscosity and crossover to high-temperature universal viscous fluid in monolayer and bilayer graphene

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By Indra Yudhistira, Universität Würzburg, Ramal Afrose, Shaffique Adam
| Physical Review B
Electrons in quantum matter behave like a fluid when the quantum-mechanical carrier-carrier scattering dominates over other relaxation mechanisms. By combining a microscopic treatment of electron-electron interactions within the random phase approximation with a phenomenological Navier-Stokes-like equation, we predict that in the limit of high temperature and strong Coulomb interactions, both monolayer graphene and bilayer graphene exhibit a universal behavior in dynamic viscosity.
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Tunable viscous layers in Corbino geometry using density junctions

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By Aydın Cem Keser, Bradfield Road, Oleg P. Sushkov, Ramal Afrose
| Physical Review B
In sufficiently clean materials where electron-electron interactions are strong compared to momentum-relaxing scattering processes, electron transport resembles the flow of a viscous fluid. We study hydrodynamic electron transport across density interfaces (n-n junctions) in a 2DEG in the Corbino geometry. From numerical simulations in comsol using realistic parameters, we show that we can produce tunable viscous layers at the density interface by varying the density ratio of charge carriers.
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