title: THz-driven nonlinear intersubband dynamics in quantum wells.
abstract: In this work, we demonstrate the direct observation of non-equilibrium intersubband dynamics in a modulation-doped multiple quantum well sample induced by intense terahertz pulses. The transmission spectra show a clear dependence on the incident THz field strength, which gives rise to a multitude of nonlinear optical effects that go beyond the standard textbook two-level description of light-matter interaction. Of special interest is thereby the multiple octave spanning bandwidth of the used single-cycle THz pulses, which allows the phase-locked coupling of adjacent intersubband transitions. Examples of this interaction include the efficient, coherent population transfer, the THz induced undressing of collective excitations, and the THz Stark effect.
authors.affiliation: Photonics Institute, Vienna University of Technology 1040 Vienna, Austria. daniel.dietze@tuwien.ac.at
authors.forename: D
authors.initials: D
authors.lastname: Dietze
authors.forename: J
authors.initials: J
authors.lastname: Darmo
authors.forename: K
authors.initials: K
authors.lastname: Unterrainer
mesh_terms: D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D011789:Quantum Theory; D012542:Scattering, Radiation; D055053:Terahertz Radiation