Search results
29,458 records were found.
Comment: 6 pages, 4 figures, accepted by PRA
Based on the finite $U$ slave boson method, we have investigated the effect
of Rashba spin-orbit(SO) coupling on the persistent charge and spin currents in
mesoscopic ring with an Anderson impurity. It is shown that the Kondo effect
will decrease the magnitude of the persistent charge and spin currents in this
side-coupled Anderson impurity case. In the presence of SO coupling, the
persistent currents change drastically and oscillate with the strength of SO
coupling. The SO coupling will suppress the Kondo effect and restore the abrupt
jumps of the persistent currents. It is also found that a persistent spin
current circulating the ring can exist even without the charge current in this
system.
Comment: Phys. Rev. Lett. in press
Comment: changed title; changed definition of vortex density surrogate "D";
additional data in Fig. 3; text revisions
Comment: 4 pages, 2 figures
We report studies of cyclotron resonance in monolayer graphene. Cyclotron
resonance is detected using the photoconductive response of the sample for
several different Landau level occupancies. The experiments measure an electron
velocity at the K- (Dirac) point of $c_{K}^{*}$ = 1.093 x 10$^{6}$ ms$^{-1}$
and in addition detect a significant asymmetry between the electron and hole
bands, leading to a difference in the electron and hole velocities of 5% by
energies of 125 meV away from the Dirac point.
