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The ground state of the two-leg Heisenberg ladder is identified as a resonating-valence-band-RVB type spin liquid, which is generated by Gutzwiller projection of tight-binding bands with flux $\ensuremath{\pi}$ per plaquet. Explicit trial wave functions for the magnon and hole excitations are formulated in terms of spinons and holons. The spinon-holon bound state is shown to violate P and T. This is interpreted as a manifestation of fractional statistics.

physical review. b, condensed matter

Two-leg<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mo>−</mml:mo><mml:mi>J</mml:mi></mml:math>ladder: A spin liquid generated by Gutzwiller projection of magnetic bands

Two-legt−Jladder: A spin liquid generated by Gutzwiller projection of magnetic bands