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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Rashba-like spin splitting in inversion symmetric plasmonic metasurface
Sujit Rajak1, Nishkarsh Kumar2, Dheeraj Yadav1
1Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, W.B., India.
None:
Spin-dependent dispersion and Rashba effect are manifestations of spin-orbit interaction (SOI) associated with the breaking of the spatial inversion symmetry in condensed matter and in optical systems. Here, we report an extraordinary spin-split dispersion effect of leaky surface plasmons in an inversion-symmetric plasmonic crystal. Momentum domain polarization analysis identified a transverse momentum-dependent linear birefringence-linear dichroism (geometric LB-LD) effect responsible for this phenomena. It is demonstrated that evolution of strong geometrical phase gradient due to the geometric LB-LD effect mediates the spin-split dispersion in inversion symmetric plasmonic metasurface through spin (circular polarization)-dependent transverse momentum. This unconventional SOI phenomena offers a new paradigm of spin-based dispersion engineering and spin-controlled nano-optical functionalities by encompassing the forbidden class of symmetric metastructures in the realm of spin optics.
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