High-spin polaron in lightly doped CuO$_2$ planes

Details High-spin polaron in lightly doped CuO$_2$ planes High-spin polaron in lightly doped CuO$_2$ planes

2010-10-09

arxiv.org/abs/1010.1867v3

Physical Review Letters 106 036401 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

To appear in Phys. Rev. Lett. Final version and Supplementary Materials will be available at the journal's website

Scientific paper

10.1103/PhysRevLett.106.036401

We device and investigate numerically a minimal yet detailed spin polaron model that describes lightly doped CuO$_2$ layers. The low-energy physics of a hole is studied by total-spin-resolved exact diagonalization on clusters of up to 32 CuO$_2$ unit cells, revealing features missed by previous studies. In particular, spin-polaron states with total spin 3/2 are the lowest eigenstates in several regions of the Brillouin zone. In these regions, and also at other points the quasiparticle weight is identically zero, indicating orthogonal states to those represented in the one electron Green's function. This highlights the importance of proper treatment of spin fluctuations in the many-body background.

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