Kavli Affiliate: Alessandra Lanzara
| First 5 Authors: Hailan Luo, Kayla Currier, Chiu-Yun Lin, Kenneth Gotlieb, Ryo Mori
| Summary:
Non-zero spin orbit coupling has been reported in several unconventional
superconductors due to the absence of inversion symmetry breaking. This
contrasts with cuprate superconductors, where such interaction has been
neglected for a long time. The recent report of a non-trivial spin orbit
coupling in overdoped Bi2212 cuprate superconductor, has re-opened an old
debate on both the source and role of such interaction and its evolution
throughout the superconducting dome. Using high-resolution spin- and
angle-resolved photoemission spectroscopy, we reveal a momentum-dependent spin
texture throughout the hole-doped side of the superconducting phase diagram for
single- and double-layer bismuth-based cuprates. The universality of the
reported effect among different dopings and the disappearance of spin
polarization upon lead substitution, suggest a common source. We argue that
local structural fluctuations of the CuO planes and the resulting charge
imbalance may cause local inversion symmetry breaking and spin polarization,
which might be crucial for understanding cuprates physics.
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