The fluctuations of the heat current in a quantum dot coupled to electron reservoirs are calculated at finite frequency, voltage, and temperature using nonequilibrium Green function technique. nonsymmetrized noise is expressed as an integral on energy containing four contributions, each which includes transmission amplitudes, electron-hole pair distribution functions, difference factors. effect...

We investigate the quantum ratchet effect under the influence of weak dissipation which we treat within a Floquet-Markov master equation approach. A ratchet current emerges when all relevant symmetries are violated. Using time-reversal symmetric driving we predict a purely dissipation-induced quantum ratchet current. This directed quantum transport results from bath-induced superpositions of no...

Nowadays carbon nanoparticles are applied on the island of single electron transistor and Nano-transistors. The basis of single electron devices (SEDs) is controllable single electron transfer between small conducting islands. Based on the important points in quantum mechanics, when a wave passes through several spatial regions with different boundaries, the wave function of the first region di...