Terahertz-induced anomalous currents following the optical excitation of excitons in semiconductor quantum wells

Cong Ngo; Shekhar Priyadarshi; Huynh Thanh Duc; Mark Bieler; Torsten Meier

doi:10.1117/12.2646022

15 March 2023 Terahertz-induced anomalous currents following the optical excitation of excitons in semiconductor quantum wells

Cong Ngo, Shekhar Priyadarshi, Huynh Thanh Duc, Mark Bieler, Torsten Meier

Author Affiliations +

Proceedings Volume 12419, Ultrafast Phenomena and Nanophotonics XXVII; 124190G (2023) https://doi.org/10.1117/12.2646022
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Anomalous currents refer to electronic currents that flow perpendicularly to the direction of the accelerating electric field. Such anomalous currents can be generated when Terahertz fields are applied after an optical interband excitation of GaAs quantum wells. The underlying processes are investigated by numerical solutions of the semiconductor Bloch equations in the length gauge. Excitonic effects are included by treating the manybody Coulomb interaction in time-dependent Hartree-Fock approximation and additionally also carrier-phonon scattering processes are considered. The band structure and matrix elements are obtained from a 14-band k · p model within the envelope function approximation. The random phase factors of the matrix elements that appear due to the separate numerical diagonalization at each k-point are treated by applying a smooth gauge transformation. We present the macroscopic Berry curvature and anomalous current transients with and without excitonic effects. It is demonstrated that the resonant optical excitation of excitonic resonances can significantly enhance the Berry curvature and the anomalous currents.

Conference Presentation

Citation Download Citation

Cong Ngo, Shekhar Priyadarshi, Huynh Thanh Duc, Mark Bieler, and Torsten Meier "Terahertz-induced anomalous currents following the optical excitation of excitons in semiconductor quantum wells", Proc. SPIE 12419, Ultrafast Phenomena and Nanophotonics XXVII, 124190G (15 March 2023); https://doi.org/10.1117/12.2646022

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