Numerical diagonalization reveals a spin excitation gap that closes at J_d/J_b ≈ 1.4 for S=1/2 and S=1, with an additional gapped phase for S=1 near the exact-dimer limit.
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Spin excitation of the Heisenberg antiferromagnet with frustration: from the bounce-lattice antiferromagnet through the maple-leaf-lattice antiferromagnet to the exact-dimer system
Numerical diagonalization reveals a spin excitation gap that closes at J_d/J_b ≈ 1.4 for S=1/2 and S=1, with an additional gapped phase for S=1 near the exact-dimer limit.