光掺杂动态 Hubbard 模型中的有效双占据和空穴温度。
Effective doublon and hole temperatures in the photo-doped dynamic Hubbard model.
机构信息
Department of Physics, University of Fribourg , 1700 Fribourg, Switzerland.
Department of Physics, University of Hamburg , Hamburg 20148, Germany ; Center for Free-Electron Laser Science, Hamburg 22761, Germany; and Max Planck Institute for the Structure and Dynamics of Matter, Hamburg 22761, Germany.
出版信息
Struct Dyn. 2015 Nov 9;3(2):023603. doi: 10.1063/1.4935245. eCollection 2016 Mar.
Hirsch's dynamic Hubbard model describes the effect of orbital expansion with occupancy by coupling the doublon operator to an auxiliary boson. In the Mott insulating phase, empty sites (holes) and doubly occupied orbitals (doublons) become charge carriers on top of the half-filled background. We use the nonequilibrium dynamical mean field method to study the properties of photo-doped doublons and holes in this model in the strongly correlated regime. In particular, we discuss how photodoping leads to doublon and hole populations with different effective temperatures, and we analyze the relaxation behavior as a function of the boson coupling and boson energy. In the polaronic regime, the nontrivial energy exchange between doublons, holes, and bosons can result in a negative temperature distribution for the holes.
赫希的动态哈伯德模型通过将双占据算符耦合到辅助玻色子上来描述轨道扩展与占据的影响。在莫特绝缘相中，空的位置（空穴）和双重占据的轨道（双占据）在半满背景之上成为电荷载流子。我们使用非平衡动力学平均场方法来研究这个模型在强关联区域中光掺杂双占据和空穴的性质。特别是，我们讨论了光掺杂如何导致具有不同有效温度的双占据和空穴，并且我们分析了弛豫行为作为玻色子耦合和玻色子能量的函数。在极化子区域中，双占据、空穴和玻色子之间的非平凡能量交换可能导致空穴的负温度分布。
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