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The combination of strong spin orbit coupling and strong correlations holdstremendous potential for interesting physical phenomena as well as applicationsin spintronics and quantum computation. In this context, we here study theinterplay between the Rashba spin-orbit coupling (RSOC) and the Kondo screeningin noncentrosymmetric $f$-electron materials. We show that the Kondo couplingof the $f$-electrons becomes anisotropic at high temperatures due to the RSOC.However, an isotropic Kondo effect is restored at low temperature which leadsto a complete Kondo screening. We furthermore demonstrate that the Kondo effecthas influence on the Rashba splitting in the band structure, which becomestemperature dependent. Although the $f$-electrons are localized at hightemperature, a helical spin polarization of the conduction band emerges due tothe scattering with the $f$-electrons. With decreasing temperature, the Kondoscreening occurs, which leads to drastic changes in the band structure.Remarkably, these changes in the band structure depend on the helical spinpolarization. For strong RSOC, we observe that the hybridization gap of one ofthe helical bands is closed at low temperature and a helical half-metal isformed.

Impact of the Rashba Spin Orbit Coupling on $f$-electron Materials