几乎交错Harper模型中的持续电流
Persistent current in an almost staggered Harper model
摘要：
本文研究了交错排列的Harper模型在接近半填充时的持续电流。Harper模型是一个准周期系统，它不同于其他具有非关联无序的一维系统，因为它可以处于金属区。然而，PC的哈珀模型的参数范围很广，并没有显示出典型的金属行为，虽然该系统是在金属制度。这是由于中心带态的性质，其是位于超晶格点中的高斯态的混合。当超晶格与系统长度不相称时，PC表现为绝缘体。因此，即使在金属状态下，一个典型的有限哈珀模型可能会表现出一个预期的PC从绝缘体。
英文摘要：
In this paper we study the persistent current (PC) of a staggered Harper model, close to the half-filling. The Harper model, which is a quasi-periodic system, is different than other one dimensional systems with uncorrelated disorder in the fact that it can be in the metallic regime. Nevertheless, the PC for a wide range of parameters of the Harper model does not show typical metallic behavior, although the system is in the metallic regime. This is a result of the nature of the central band states, which are a hybridization of Gaussian states localized in superlattice points. When the superlattice is not commensurate with the system length, the PC behaves as in an insulator. Thus even in the metallic regime a typical finite Harper model may exhibit a PC expected from an insulator.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
