非平衡Peierls相变
Nonequilibrium Peierls Transition
摘要：
利用平均场近似和非平衡统计力学的代数场方法得到的非平衡定态公式，研究了具有两个库的开放Takayama-Lin Liu-Maki链的非平衡相变.当选择偏置电压作为控制参数时，发现有序相和正常相之间的相变是一阶或二阶的。在某些参数范围内，电压-电流特性呈S形。相反，当选择电流作为控制参数时，自洽方程的所有非平凡解都变得稳定。在这种情况下，有序相和正常相之间的相变总是二级的，并且在低温下出现负微分电导率。
英文摘要：
Nonequlibrium phase transition of an open Takayama-Lin Liu-Maki chain coupled with two reservoirs is investigated by combining a mean-field approximation and a formula characterizing nonequlibrium steady states, which is obtained from the algebraic field approach to nonequlibrium statistical mechanics. When the bias voltage is chosen to be a control parameter, the phase transition between ordered and normal phases is found to be first or second order. Then, the voltage-current characteristics is S-shaped in some parameter region. In contrast, when the current is chosen to be a control parameter, all the non-trivial solutions of the self-consistent equation are found to become stable. In this case, the phase transition between the ordered and normal phases is always second order and negative differential conductivity appears at low temperature.
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