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- W2011371570 abstract "Strongly correlated systems in low dimensions display a large variety of fascinating properties like high-Tc superconductivity, quantum antiferromagnetism, quantum ferromagnetism or charge ordering. Theoretically, these phenomena are investigated in simplified models like the Hubbard model, the Heisenberg model and the t-J model. These models are derived from ab-initio calculations, from more elaborate models, for instance threeband Hubbard models, or they are motivated by phenomenological considerations. In the t-J model transitions to double occupancies are forbidden. This represents a hardcore constraint. An analogous constraint arises if the magnons in an ordered Heisenberg model of spin S are treated as bosons. At most 2S magnons may be present at each site. A reliable treatment of such constraints is still a great challenge to condensed matter theory. Straightforward approaches like mean-field approximations fail because of the large" @default.
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- W2011371570 date "2006-05-01" @default.
- W2011371570 modified "2023-09-24" @default.
- W2011371570 title "Hard-core magnons in the S=1/2 Heisenberg model on the square lattice" @default.
- W2011371570 hasPublicationYear "2006" @default.
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