Modes of Magnetic Resonance in the Spin-Liquid Phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Cs</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuCl</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>

We report the observation of a frequency shift and splitting of the electron spin resonance (ESR) mode of the low-dimensional $S=1/2$ frustrated antiferromagnet ${\mathrm{Cs}}_{2}{\mathrm{CuCl}}_{4}$ in the spin-correlated state above the ordering temperature 0.62 K. The shift and splitting exhibit strong anisotropy with respect to the direction of the applied magnetic field and do not vanish in a zero field. The low-temperature evolution of the ESR is a result of the modification of the one-dimensional spinon continuum by the uniform Dzyaloshinskii-Moriya interaction within the spin chains.

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