On the classification of the low energy excitations in the doped antiferromagnet |
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Authors: | Sandro Sorella |
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Affiliation: | (1) International School for Advanced Studies, Via Beirut 2-4, I-34013 Trieste, Italy |
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Abstract: | A long-wavelength, low energy hamiltonian is derived to describe the dynamic of a single hole in a quantum antiferromagnet in two or higher spatial dimensions. In thisexactly solvable limit anew kind of symmetry is important to classify the elementary spin excitations of a single hole in the t — J model. This symmetry is hidden at finite size or at short wavelength. The resulting classification has important consequences for understanding the physics of doped antiferromagnets. Fermi liquid like s = 1/2 and charge one excitations are still well defined in a quantum antiferromagnet, but are not a complete set to describe the low energy physics. |
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