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交错磁场下二维三角晶格中的拓扑量子相变
  • 时间：0
  • 分类：O46[理学—电子物理学;理学—物理]
  • 作者机构：[1]苏州大学物理科学与技术学院
  • 相关基金：国家自然科学基金(11074183)
作者： 严密[1]
关键词： 拓扑量子相变, 紧束缚模型, 三角晶格, 交错磁通
中文摘要：

详细研究了二维三角格子中的紧束缚电子在交错磁场驱动下的拓扑量子相变.总磁场由磁通为Ф的均匀磁场和磁通为ΔФ的交错磁场两部分构成.当均匀磁通Ф固定时,交错磁通强度的改变会导致量子Hall电导的跳变和邻近Landau子能带间Chern数的重新分配.这种相变在弱无序情况下仍然存在.通过计算系统的基态能,这种相变是三级相变.我们也研究基态保真度随交错磁通从0增大到ΔФc时的变化情况.

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