科研之友
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摘要
We consider the translationally invariant but parity (left-right symmetry) breaking Ising chain Hamiltonian H = -U-2 Sigma(k) s(k) s(k+1) - U-3 Sigma(k) s(k) s(k+1) s(k+3) and let this system evolve by Kawasaki spin exchange dynamics. Monte Carlo simulations show that perturbations forcing this system off equilibrium make it act as a Brownian molecular motor which, in the lattice gas interpretation, transports particles along the chain. We determine the particle current under various different circumstances, in particular as a function of the ratio U-3/U-2 and of the conserved magnetization M = Sigma(k) s(k). The symmetry of the U-3 term in the Hamiltonian is discussed.
- 出版日期2014-10
