Is the pi-particle responsible for the 41 meV peak in YBa_2Cu_3O_7?
Martin Greiter (Stanford University)
TL;DR
The paper argues against the existence of a low-energy pi-resonance in YBa2Cu3O7, challenging the SO(5) symmetry hypothesis in the Hubbard model and reinterpreting recent finite-size studies.
Contribution
It provides a theoretical critique showing the pi-operators do not produce a low-energy resonance, questioning the SO(5) symmetry in the Hubbard model.
Findings
No low-energy pi-resonance in YBa2Cu3O7
Reinterpretation of finite-size studies
Challenges the SO(5) symmetry hypothesis
Abstract
It is argued that there is no low-energy resonance associated with the pi-operators introduced by Demler and Zhang. This implies that the Hubbard model does not possess an approximate SO(5) symmetry generated by these operators. Recent finite-size studies are re-interpreted accordingly.
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