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Title: Ultrafast entanglement switching and singlet–triplet transitions control via structured terahertz pulses
Author(s): Wätzel, Jonas
Berakdar, Jamal
Sherman, E Ya
Issue Date: 2022
Type: Article
Language: English
Abstract: Terahertz (THz) vector beams with spatially textured polarization are proposed to steer the spin and spatial distributions of two interacting electrons in a quantum dot. We study theoretically the spatiotemporal evolution of the spin and the charge-current densities and quantify the behavior of entanglement by calculating the concurrence. Both aspects are shown to be controllable efficiently and on the picosecond (ps) time scale by the parameters of the driving fields. Analyzing two different materials, GaAs and InGaAs, with different electron g-factors, we study the relationship between the g-factor and type of spin–orbit coupling required to produce efficient interlevel transitions. The results are useful for applications of quantum dots as basic nanoscale hardware elements in quantum information technology and for producing swiftly the appropriate spin and charge currents on demand.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Sponsor/Funder: Publikationsfonds MLU
Journal Title: New journal of physics
Publisher: Dt. Physikalische Ges.
Publisher Place: [Bad Honnef]
Volume: 24
Original Publication: 10.1088/1367-2630/ac608a
Appears in Collections:Open Access Publikationen der MLU

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