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Abstract: Using density matrix renormalization group DMRG and perturbative continuousunitary transformations PCUTs, we study the magnetization process in amagnetic field for all coupling strengths of a quasi-1D version of the 2DShastry-Sutherland lattice, a frustrated spin tube made of two orthogonal dimerchains. At small inter-dimer coupling, plateaus in the magnetization appear at1-6, 1-4, 1-3, 3-8, and 1-2. As in 2D, they correspond to a Wigner crystal oftriplons. However, close to the boundary of the product singlet phase, plateausof a new type appear at 1-5 and 3-4. They are stabilized by the localization of{\it bound states} of triplons. Their magnetization profile differssignificantly from that of single triplon plateaus and leads to specific NMRsignatures. We address the possibility to stabilize such plateaus in furthergeometries by analyzing small finite clusters using exact diagonalizations andthe PCUTs.



Autor: Salvatore R. Manmana, Jean-David Picon, Kai P. Schmidt, Frédéric Mila

Fuente: https://arxiv.org/







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