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Paper detail

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

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.

preprint2016arXivOpen access
M. OzerovM. MaksymenkoJ. WosnitzaA. HoneckerC. P. LandeeM. M. TurnbullS. C. FuruyaT. GiamarchiS. A. Zvyagin
cond-mat.str-el
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M. OzerovM. MaksymenkoJ. WosnitzaA. HoneckerC. P. LandeeM. M. TurnbullS. C. FuruyaT. GiamarchiS. A. Zvyagin

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