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arXiv 2104.01245cond-mat.dis-nn
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三维激子谱的无序重整化

Renormalization of the 3D exciton spectrum by the disorder

R. E. Putnam, M. E. Raikh

摘要:

研究了短程无序对激子激发态的影响。无序引起明显的加宽效应。在微观上,激子作为一个实体被大尺度无序涨落散射。更重要的是,周期为玻尔半径量级的短尺度波动会导致激子能级的明确下移。我们证明了这种位移在参数上超过了加宽,并研究了这种位移对轨道数的依赖性。相邻能级位移的差异导致玻尔能量的有效重整化。最显著的效应是S和P激子能级的无序诱导分裂。分裂起源于无序提升了类氢能级的偶然简并。他们把这种分裂与量子电动力学中的兰姆位移进行了类比。

英文摘要:

Effect of short-range disorder on the excited states of the exciton is studied. Disorder causes an obvious effect of broadening. Microscopically, an exciton, as an entity, is scattered by the large-scale disorder fluctuations. Much less trivial is that short-scale fluctuations, with a period of the order of the Bohr radius, cause a well-defined down-shift of the exciton levels. We demonstrate that this shift exceeds the broadening parametrically and study the dependence of this shift on the orbital number. Difference of the shifts for neighboring levels leads to effective renormalization of the Bohr energy. Most remarkable effect is the disorder-induced splitting of S and P exciton levels. The splitting originates from the fact that disorder lifts the accidental degeneracy of the hydrogen-like levels. The draw an analogy between this splitting and the Lamb shift in quantum electrodynamics.

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