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Transport of Brownian particles on a simple sawtooth potential subjected toboth unbiased thermal and nonequilibrium symmetric three-level Markovian noiseis considered. The new effects of three and four current reversals as afunction of temperature are established in such correlation ratchets. Theparameter space coordinates of the fixed points associated with these currentreversals and the necessary and sufficient conditions for the existence of thenovel current reversals are found.Comment: 4 pages, 5 figures; some changes introduced; accepted for publication  in Physical Review

Three and four current reversals versus temperature in correlation ratchets with a simple sawtooth potential