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arXiv:cond-mat/9505085 · Nuclear Physics B

Evidence for composite nature of quasiparticles in the 2D t-J model

P. Béran, Didier Poilblanc, R. B. Laughlin

Published Aug 1, 1996• 70 citations
arXivHTMLPDF
DOI
10.1016/0550-3213(96)00196-4

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The density of state for the single hole in the two-dimensional t-J model is studied in the presence of a constant and homogeneous magnetic field by means of exact calculations for small systems and spin-wave perturbative calculations for larger systems. As the field is turned on, the energy of the ground state is reduced by an amount proportional to parameter t and depending weakly on J. This result, together with the behavior of the Drude weight of the doped t-J model, yields strong support for the idea that the dynamics of charge carriers is governed by parameter t. This idea, confronted to the existence in the spectral density of the hole of a quasiparticle peak dispersing with J, constitutes evidence for the composite nature of quasiparticles. \textcopyright{} 1996 The American Physical Society.
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