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Title

Electron spin resonance modes in a strong-leg ladder in the Tomonaga-Luttinger liquid phase

Authors
Ozerov, M.
Maksymenko, M.
Wosnitza, J.
Honecker, A.
Landee, C. P.
Turnbull, M. M.
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Published in Physical Review. B, Condensed Matter. 2015, vol. 92, no. 24, p. 241113
Abstract 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 nonlinear 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 their ESR observability to the uniform Dzyaloshinskii-Moriya interaction.
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Research group Groupe Giamarchi
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OZEROV, M. et al. Electron spin resonance modes in a strong-leg ladder in the Tomonaga-Luttinger liquid phase. In: Physical Review. B, Condensed Matter, 2015, vol. 92, n° 24, p. 241113. https://archive-ouverte.unige.ch/unige:87804

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Deposited on : 2016-09-27

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