The decay of quantum vortex rings in counterflow regimes, visualized Helium II with the help solid hydrogen particles trapped to their cores, has been a puzzling issue within usual description superfluid dynamics, grounded on hypothesis that filament is, effectively, an extended massless object subject canceling superposition Magnus and mutual friction forces. We discuss, from general energy-bu...

Using the continuum model, we investigate electronic properties of two types bilayer graphene (BLG) quantum ring (QR) geometries: (i) An isolated BLG QR and (ii) a monolayer (MLG) with put on top an infinite sheet (hybrid QR). Solving Dirac-Weyl equation in presence perpendicular magnetic field applying mass boundary condition at boundaries, obtain analytical results for energy levels correspon...