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arXiv · 1509.02056

ESR modes in a Strong-Leg Ladder in the Tomonaga-Luttinger Liquid Phase

M. Ozerov·M. Maksymenko·J. Wosnitza·A. Honecker·C. P. Landee·M. M. Turnbull·S. C. Furuya·T. Giamarchi·S. A. Zvyagin
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Abstract

Magnetic excitations in the strong-leg quantum spin ladder compound (C$_7$H$_{10}$N)$_2$CuBr$_4$ (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.

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M. Ozerov, M. Maksymenko, J. Wosnitza, A. Honecker, C. P. Landee, M. M. Turnbull, S. C. Furuya, T. Giamarchi, S. A. Zvyagin. 2016-01-12. ESR modes in a Strong-Leg Ladder in the Tomonaga-Luttinger Liquid Phase. https://doi.org/10.1103/physrevb.92.241113

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