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Pairing and Excitation Spectrum in doped t-J Ladders

Hirokazu Tsunetsugu·Matthias Troyer·T. Maurice Rice
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Abstract

Exact diagonalization studies for a doped t-J ladder (or double chain) show hole pairing in the ground state. The excitation spectrum separates into a limited number of quasiparticles which carry charge $+|e|$ and spin ${1 \over 2}$ and a triplet mode. At half-filling the former vanish but the latter evolves continuously into the triplet band of the spin liquid. At low doping the quasiparticles form a dilute Fermi gas with a strong attraction but simultaneously the Fermi wavevector, as would be measured in photoemission, is large.

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Hirokazu Tsunetsugu, Matthias Troyer, T. Maurice Rice. 1994-01-24. Pairing and Excitation Spectrum in doped t-J Ladders. https://doi.org/10.1103/physrevb.49.16078

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