激子绝缘体的超导态
Superconducting state of excitonic insulator
摘要：
研究了激子绝缘体在电流作用下的状态。最初，在金属相中，电子和空穴被假设为在相反的方向上移动，因此存在电流。这种状态由外部条件支持（样品处于有电流的电路中）。当温度降低时，由于电子-空穴对的形成而转变到有序状态是可能的（类似于激子绝缘体的普通状态）。研究了零温态的性质。基元激发谱存在一个能隙，从而得出所得到的态是超导态的结论。因此，取决于外部条件，激子绝缘体本身表现得像绝缘体或超导体。在电子-空穴对的强重叠的限制下，这是正确的。
英文摘要：
A state of an excitonic insulator with the electric current is studied. Initially, in the metallic phase, the electrons and holes are assumed to be moving in the opposite directions, so as the electric current exists. This state is supported by an external condition (the specimen is in an electric circuit with the current). When the temperature decreases, the transition to the ordering state due to formation of the electron--hole pairs is possible (similar to the ordinary state of the excitonic insulator). The properties of the state at zero temperature are investigated. The spectrum of elementary excitations has a gap, and so the conclusion can be made that obtained state is superconducting one. Thus, depending on the external conditions, excitonic insulator behaves itself like the insulator or superconductor. That is correct in the limit of strong overlapping of the electron--hole pairs.
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