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Updated: Oct 5, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Spin-Polarized Fractional Corner Charges and Their Photonic Realization
Ran Gladstein Gladstone1, Minwoo Jung2, Gennady Shvets1
1School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.
Abstract:
We demonstrate that a spin degree of freedom can introduce additional texture to higher order topological insulators (HOTIs), manifesting in novel topological invariants and phase transitions. Spin-polarized mid-gap corner states of various multiplicities are predicted for different HOTI phases, and novel bulk-boundary correspondence principles are defined based on bulk invariants such as total and spin corner charge. Those are shown to be robust to spin-flipping perturbations. Photonic realizations of spin-linked topological phases are demonstrated in engineered systems using pseudospin.
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