Ultrafast entanglement switching and singlet–triplet transitions control via structured terahertz pulses
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 enta...
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| Veröffentlicht in: | New journal of physics 2022-04, Vol.24 (4), p.43016 |
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| creator | Wätzel, Jonas Berakdar, Jamal Sherman, E Ya |
| description | 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. |
| doi_str_mv | 10.1088/1367-2630/ac608a |
| format | Article |
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g
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g
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g
-factors, we study the relationship between the
g
-factor and type of spin–orbit coupling required to produce efficient interlevel transitions. 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g
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g
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| subjects | Charge density Mathematical analysis Physics quantum dot Quantum dots Quantum entanglement Quantum phenomena Spatial distribution spin manipulation Spin-orbit interactions vector beams |
| title | Ultrafast entanglement switching and singlet–triplet transitions control via structured terahertz pulses |
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