SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 9: Quantum Dynamics, Decoherence and Quantum Information

DY 9.3: Vortrag

Montag, 27. März 2023, 14:30–14:45, MOL 213

Giant Residual Current from Ultrafast AC Driving of Bloch Electrons — •Adrian Seith, Jan Wilhelm, and Ferdinand Evers — Institut für Theoretische Physik, Universität Regensburg

In recent experiments, residual currents were seen to survive long after the laser illumination has died out[1]. Motivated by a vision of a "light-wave electronics", the effect has been utilized to design a petahertz logical gate[2].

In this work, we theoretically study residual currents of Bloch electrons and demonstrate that residual currents can be as large as the maximum current during illumination.

Based on a perturbative expansion of the semiconductor-Bloch equations, we derive an analytical formula; it explains the strong dependence of residual currents on the model parameters and the laser pulse shape. In particular, our formula allows to optimize pulse shapes for maximizing the residual currents' magnitude reaching values order of magnitudes larger than observed in recent experiments.

[1] Higuchi et. al., Nature 550, 224 (2017)

[2] Boolakee et. al., Nature 605, 251 (2022)