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[en] The thermopower of asymmetrical quantum wires and constrictions in an arbitrarily directed magnetic field is investigated. An analytic expression convenient for analysing the thermopower is obtained. The oscillations in the thermopower are studied. It is shown that the thermopower as a function of a magnetic field can undergo Aharonov-Bohm and Shubnikov-de Haas oscillations
[en] Generation of direct current in a semiconductor superlattice under the action of an ac bichromatic field is considered in the most general case of an arbitrary ratio of the frequencies of the fields being mixed. It is shown that this effect is of parametric origin associated with oscillations of the electron effective mass in the miniband of the superlattice.