Comment on “Z2-slave-spin theory for strongly correlated fermions”
The authors of Ref. 1 introduced a new slave-spin (SS) mean-field (MF) approach to the Hubbard model of strongly correlated electrons in terms of Ising spins and standard fermion operators by constructing an enlarged Hilbert space with both physical and unphysical states. The purpose of this co...
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| Principais autores: | , |
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| Formato: | article |
| Idioma: | English |
| Publicado em: |
PHYSICAL REVIEW B
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| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/28840 |
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| Resumo: | The authors of Ref. 1 introduced a new slave-spin (SS)
mean-field (MF) approach to the Hubbard model of strongly
correlated electrons in terms of Ising spins and standard
fermion operators by constructing an enlarged Hilbert space
with both physical and unphysical states. The purpose of
this construction is clear: this formulation involves a much
smaller number of slave fields, compared with more standard
slave particle frameworks. In this way, the complexity of the
original model is reduced to a more readily tractable system
of Ising spins in a transverse field coupled to free fermions.
In this Comment, we show that the unphysical states are not
properly excluded, and despite the claimed good agreement
with previous results, the consistency of their MF theory is
unjustified |
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