Phys.org April 16, 2024
Harnessing the asymmetric electronic population in the conduction band induced by an intense single-color circularly polarized laser pulse an international team of researchers (Japan, India, Germany) developed a universal method to generate ultrafast photocurrent in both inversion-symmetric and inversion-broken Weyl semimetals with degenerate Weyl nodes at the Fermi level. They found that the induced photocurrent could be tailored by manipulating helicity and ellipticity of the employed laser. Their approach generated photocurrent in realistic situations when the Weyl nodes were positioned at different energies and had finite tilt along a certain direction. According to the researchers their work adds a new dimension on practical applications of Weyl semimetals for optoelectronics and photonics-based quantum technologies… read more. TECHNICAL ARTICLE  1 , 2 Â
A scheme based on linearly polarized light and its second harmonic to generate photocurrent… Credit: Phys. Rev. B 109, 104309, 15 March 2024