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- W1997922155 abstract "The problem of the single-hole motion in a two-dimensional quantum Heisenberg antiferromagnet is examined in the t-J model. By introducing a kind of slave-fermion representation for Hubbard operators a hole is treated as a spinless fermion strongly interacting with spin-1/2 degrees of freedom. We suggest an analytic approach based on a decoupling procedure for two-time fermionic Green functions that allows us to describe a hole as a magnetic polaron of a minimal size (i.e., involving one-step ``string'' spin excitations) and reproduce the main features characteristic of a one-hole band in a quantum antiferromagnet. A generalization of the procedure in the spirit of the Lanczos approach to extend the internal structure of the magnetic polaron is discussed." @default.
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- W1997922155 date "1993-01-01" @default.
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- W1997922155 title "Quasiparticle band structure of a hole in a quantum Heisenberg antiferromagnet" @default.
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- W1997922155 doi "https://doi.org/10.1103/physrevb.47.1103" @default.
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