Physical effects in low-dimensional systems subjected to local high-frequency field

Non-uniform 1D systems subjected to uniform alternating electric field are considered. Studied objects include wires of alternating width, and also curved quantum wires of constant width, such as spirals, “angle”, “omega”-like curves. The shape determines non-homogeneity of acting component of electric field resulting in non-conservation of electron momentum. Physical effects like photoconductivity and stationary photocurrent are investigated. Different mathematical approaches are utilized, in particular, quantum transfer-matrix and classical kinetic equation.Electron states in a system with vibrating delta-functional potential in the presence of additional stationary potential gap are studied. The absorption of light, photocurrent and photoconductivity of the system are found. The existence of high-frequency blockade states and the states of ideal reflection is established.Quantum spiral subjected to circular polarized light is considered. It is shown that the light generates effective wave propagating along the wire the wave vector of which is determined by the spiral pitch. The stationary drag current caused by this wave is studied. Similar drag current in locally curved wires with and without impurities is examined based on the classical kinetic equation.