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- W83065082 abstract "The investigation of photo induced electric currents in the terahertz frequency range is a vastly efficient tool for the study of nonequilibrium processes in low-dimensional structures. In this work, non-linear transport phenomena in graphene as well as in silicon – both being multi-valley semiconductors – driven by the free-carrier absorption of electromagnetic radiation are explored. It is demonstrated that the individual control of electron fluxes in different valleys can be achieved by the excitation of valley degenerate structures with polarized light. Moreover, the experiments together with theoretical considerations show that the microscopic origins of these currents are mainly orbital mechanisms. Thus, novel models of photocurrents are developed, where the charge carriers' orbital motion is caused by the crossed alternating electric and magnetic field components of the incident radiation. Under asymmetric photoexcitation or relaxation, this may result in a directed electric current." @default.
- W83065082 created "2016-06-24" @default.
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- W83065082 date "2011-09-14" @default.
- W83065082 modified "2023-09-27" @default.
- W83065082 title "Orbital photocurrents induced by terahertz laser radiation in multi-valley semiconductors" @default.
- W83065082 hasPublicationYear "2011" @default.
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