Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 53: Low-Dimensional Systems: 1D - Theory
TT 53.5: Vortrag
Mittwoch, 9. März 2016, 16:00–16:15, H23
ESR modes in a Strong-Leg Ladder in the Tomonaga- Luttinger Liquid Phase — •S. Zvyagin1, M. Ozerov2, M. Maksymenko3, J. Wosnitza1, A. Honecker4, C.P. Landee5, M. Turnbull5, S. Furuya6, and T. Giamarchi6 — 1HLD-HZDR, Dresden, Germany — 2Radboud University, Nijmegen, The Netherlands — 3Weizmann Institute of Science, Rehovot, Israel — 4Universite de Cergy-Pontoise, Cergy-Pontoise Cedex, France — 5Clark University, Worcester, MA, USA — 6University of Geneva, Geneva, Switzerland
Magnetic excitations in the strong-leg quantum spin ladder compound (C7H10N)2CuBr4 (known as DIMPY) in the field-induced Tomonaga-Luttinger spin liquid phase are studied by means of high-field electron spin resonance (ESR) spectroscopy. The presence of a gapped ESR mode with unusual non-linear frequency-field dependence is revealed experimentally. Using a combination of analytic and exact diagonalization methods, we compute the dynamical structure factor and identify this mode with longitudinal excitations in the antisymmetric channel. We argue that these excitations constitute a fingerprint of the spin dynamics in a strong-leg spin-1/2 Heisenberg antiferromagnetic ladder and owe its ESR observability to the uniform Dzyaloshinskii-Moriya interaction.
This work was partially supported by the DFG and Helmholtz Gemeinschaft (Germany), Swiss SNF under Division II, and ERC synergy UQUAM project. We acknowledge the support of the HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL).