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Ward, Simon; Bouillot, P.; Kollath, C.; Giamarchi, T.; Schmidt, K.P.; Normand, Bruce; Krämer, Karl; Biner, Daniel; Bewley, R.; Guidi, T.; Boehm, Martin; McMorrow, Des; Rüegg, Christian (2017). Bound states and field-polarized Haldane modes in a quantum spin ladder. Physical review letters, 118(17) American Physical Society 10.1103/PhysRevLett.118.177202