Author:
Runge M.,Kang T.,Biermann K.,Reimann K.,Woerner M.,Elsaesser T.
Abstract
Transient electronic shift currents generated upon intersubband excitation of asymmetric AlGaAs quantum wells efficiently emit mono-cycle terahertz (THz) pulses. The mechanism is characterized and separated from difference-frequency generation by nonlinear two-dimensional THz spectroscopy.