Fig. 5: Schematic illustration of the shifted Rashba bands and resulting asymmetric THz emission. | Nature Communications

Fig. 5: Schematic illustration of the shifted Rashba bands and resulting asymmetric THz emission.

From: Coherent control of asymmetric spintronic terahertz emission from two-dimensional hybrid metal halides

Fig. 5: Schematic illustration of the shifted Rashba bands and resulting asymmetric THz emission.The alternative text for this image may have been generated using AI.

a, b Formation of an electric polarization \({{{{{{\bf{p}}}}}}}_{{{{{{{\mathrm{dipole}}}}}}}}(z)\) along the z-axis across the interfacial layered structure of the 2D-HMH film in the vicinity of the 2D-HMH/NiFe interface under positive (+B) and negative (−B) magnetic fields, respectively. \({{{{{{\bf{J}}}}}}}_{p}({P}_{{{{{{{\mathrm{laser}}}}}}}})\) is the polarization current along the x-direction induced by linear polarization of the laser pump pulse. c, d A sketch of the shifted Rashba bands in the presence of momentum shift, Px < 0 at the +\({{{{{{\bf{p}}}}}}}_{{{{{{{\mathrm{dipole}}}}}}}}(z)\) side according to Eq. (2). The red (black) arrows indicate the injected spin polarization at +B (−B) magnetic field. e, f The shifted Rashba bands at the −\({{{{{{\bf{p}}}}}}}_{{{{{{{\mathrm{dipole}}}}}}}}(z)\) side (Px > 0). The generated THz emission containing both the field-dependent IREE and the field-independent momentum shift components is shown at different fields and surfaces that account for the asymmetric THz radiation.

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