Pub Date : 2024-06-25DOI: 10.1140/epjb/s10051-024-00718-z
J. Spiechowicz, J. Łuczka
We present a perspective of simple models of nonequilibrium directed transport described in terms of a Langevin equation formalism. We consider a Brownian particle under various circumstances and driven by thermal (equilibrium) and non-thermal (active) fluctuations. Three examples of startling behavior are unveiled: giant transport, multiple current reversal and negative mobility.
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Pub Date : 2024-06-25DOI: 10.1140/epjb/s10051-024-00731-2
T. G. Naghiyev, R. F. Babayeva, Y. I. Aliyev
The temperature dependence of photoconductivity in p-GaSe crystals with different initial (having at 77 K) dark resistivities (ρ77 = 2·103 ÷ 7·106 Ω·cm) was experimentally studied in the temperature range of 77 ÷ 300 K. It has been established that in crystals with ρ77 < 104 Ω cm, only the value of the photocurrent changes depending on temperature. At T ≤ 250 K, in the higher-resistivity crystal, the spectral distribution, lux-ampere characteristic, as well as photoconductivity kinetics also change noticeably with a change in temperature. The obtained experimental results are explained on the basis of a model of crystalline semiconductor with random macroscopic defects.