Bound States and Field-Polarized Haldane Modes in a Quantum Spin Ladder

Article Article scientifique Article Bound States and Field-Polarized Haldane Modes in a Quantum Spin Ladder eng 2017 author Ward Simon 833801 author Mena M. author Bouillot Pierre 542841 author Kollath Corinna 633166 author Giamarchi Thierry 134665 author Schmidt K. P. author Normand B. author Krämer K. W. author Biner D. author Bewley R. author Guidi T. author Boehm M. author McMorrow D. F. author Ruegg Christian 790594 177202 10.1103/PhysRevLett.118.177202 0031-9007 The challenge of one-dimensional systems is to understand their physics beyond the level of known elementary excitations. By high-resolution neutron spectroscopy in a quantum spin-ladder material, we probe the leading multiparticle excitation by characterizing the two-magnon bound state at zero field. By applying high magnetic fields, we create and select the singlet (longitudinal) and triplet (transverse) excitations of the fully spin-polarized ladder, which have not been observed previously and are close analogs of the modes anticipated in a polarized Haldane chain. Theoretical modeling of the dynamical response demonstrates our complete quantitative understanding of these states. Dewey 500.2 33 Département de physique de la matière quantique 131 false 780 Groupe Giamarchi 807 Groupe Ruegg Physical Review Letters 118 17 38f1dd6e-79d1-4b38-b4cb-c0c337213e03 Article (Published version) Public Ward-2017.pdf 1956083 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

Title	Published in	Access level	OA Policy	Year	Views	Downloads

Bound States and Field-Polarized Haldane Modes in a Quantum Spin Ladder	Physical Review Letters			2017	566	251

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Ward, Simon