8 research outputs found
Rashba effective spin-orbit coupling in photonic lattices
We demonstrate theoretically and experimentally the Rashba effect using light in two "counterpropagating" photonic lattices. We observe breaking of inversion symmetry in the resulting band structure
Photoinduced quantum magnetotransport properties of silicene and germanene
Silicene and germanene have remarkable electronic properties due to strong spin orbit
coupling and buckled single layer structures. We derive and analyze the band structures of
these materials in the presence of perpendicular electric and magnetic fields taking into
account the effects of off-resonant light. Using linear response theory,
analytical expressions are derived and evaluated for the Hall and longitudinal
conductivities. Contrary to graphene, we show that the light leads to a single Dirac cone
state and thus to unusual plateaus and magnetotransport properties, which are desirable
for electronic applications
Dynamical merging of Dirac points in the periodically driven Kitaev honeycomb model
We study the effect of a half wave rectified sinusoidal electromagnetic (EM)
wave on the Kitaev honeycomb model with an additional magneto-electric coupling
term {arising due to induced polarization of the bonds. Within the framework of
Floquet analysis, we show that merging of a pair of Dirac points in the gapless
region of the Kitaev model leading to a semi-Dirac spectrum is indeed possible}
by externally varying the amplitude and the phase of the EM field.Comment: 10 pages, 7 figures: Text modified and new figures adde