Journal
PHYSICAL REVIEW LETTERS
Volume 112, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.127002
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Funding
- Max Planck-UBC Centre for Quantum Materials
- Killam
- Alexander von Humboldt
- NSERC's Steacie Memorial Fellowship Programs
- Canada Research Chairs Program
- NSERC
- CFI
- CIFAR Quantum Materials
- MEXT KAKENHI [22103002]
- Deutsche Forschungsgemeinschaft via Forschergruppe [FOR 1346]
- Alfred P. Sloan
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Spin-orbit coupling has been conjectured to play a key role in the low-energy electronic structure of Sr2RuO4. By using circularly polarized light combined with spin-and angle-resolved photoemission spectroscopy, we directly measure the value of the effective spin-orbit coupling to be 130 +/- 30 meV. This is even larger than theoretically predicted and comparable to the energy splitting of the d(xy) and d(xz,yz) orbitals around the Fermi surface, resulting in a strongly momentum-dependent entanglement of spin and orbital character in the electronic wavefunction. As demonstrated by the spin expectation value <(S-k) over arrow.(S-k) over arrow > calculated for a pair of electrons with zero total momentum, the classification of the Cooper pairs in terms of pure singlets or triplets fundamentally breaks down, necessitating a description of the unconventional superconducting state of Sr2RuO4 in terms of these newly found spin-orbital entangled eigenstates.
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