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We study the ground state of the 4-leg spin ladder using a dimer-RVB ansatzand the Lanczos method. Besides the well known resonance mechanism betweenvalence bond configurations we find novel interference effects among nearbyresonances.Comment: 4 pages, RevTex, 7 eps fig

Dimer–resonating valence bond state of the four-leg Heisenberg ladder: Interference among resonances