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TT: Fachverband Tiefe Temperaturen

TT 24: Poster Session: Transport

TT 24.9: Poster

Donnerstag, 30. September 2021, 13:30–16:00, P

Direct current from AC driving of Dirac Fermions — •Adrian Seith, Jakob Schlosser, Jan Wilhelm, and Ferdinand Evers — Institut für Theoretische Physik, Universy of Regensburg, Germany

Recent developments in systems driven by an ultra-short laser pulse demonstrate the high-order harmonic generation in topological systems with a Dirac-type (surface) bandstructure [1]. We investigate the current-density that results from the laser pulse close to the surface. Simulations based on the Semiconductor Bloch equations as implemented in the CUED code [2] indicate the emergence of a DC-like current with a lifetime by far exceeding the pulse duration. An analytical solution within a model system of Dirac Fermions is possible explaining the effect rigorously together with the observed dependence on the carrier envelope phase (CEP). Consequences for experiments with realistic band structures are discussed, as well as applications to light-wave-electronics.
[1] Schmid et. al., Nature 593, 385 (2021)
[2] Wilhelm et. al., Phys. Rev. B 103, 125419 (2021)