Abstract
The Johnson noise due to spontaneous fluctuations of the polarization field has been observed in the ferroelectric liquid crystal SCE-9 in a confined geometry. The noise vanishes in the paraelectric smectic-A phase. In the ferroelectric phase, the short-circuit power spectrum of the fluctuating electric current equals zero in the low-frequency limit and reaches a finite value at high frequencies. The fluctuating current power spectra are in excellent agreement with the generalized Nyquist theorem and are fully consistent with electro-optic linear response measurements.
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