MESOSCOPIC RING UNDER THE INFLUENCE OF TIME-PERIODICAL FLUX - AHARONOV-BOHM OSCILLATIONS AND TRANSMISSION OF WAVE-PACKETS

The Aharonov-Bohm oscillations in the transmission probability of a on e-dimensional mesoscopic ring between two electrodes are considered nu merically where a time-periodical flux gamma(t)=gamma+lambda cos omega t is applied. Such a flux simulates a phase-coherent inelastic scatte ring due to the absorption/emission processes of modulation quanta. An increase of alternating flux amplitude lambda drastically changes the Aharonov-Bohm oscillations of the transmission though the exact perio d remains phi(0)=hc/e. A frequency dependence of the transmission has abrupt steps at omega=(E-E(F))/n, caused by the locking of the transmi ssion in the nth channel where EF is the Fermi level. Moreover, for tr ansmission of a narrow wave packet the time-periodical flux gives rise to two effects. The first is a fractioning of the input wave packet b y the ring in such a way that the output wave function consists of a f ew separate wave packets. Their number, distance apart, and height ess entially depend on the static flux gamma. The second effect is a stron g space squeezing of the output wave packet.