The response of a one-dimensional charge-density wave weakly pinned by impurities to perturbations which change the Q vector is analyzed. From Monte Carlo calculations Q is found to lag behind the equilibrium value and the response is different for perturbations which move Q away from or towards equilibrium. Q changes by addition or removal of phase solitons and the metastability arises from the energy barriers for these processes. The behavior is similar to the pressure-induced hysteresis of Q observed in Cr.
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Littlewood et al. (1982) studied this question.
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