Formation of two-dimensional polarons that are absent in three-dimensional crystals

被引：20

作者：

Muntwiler, M. ^{[1
]}

Zhu, X.-Y. ^{[1
]}

机构：

[1] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.98.246801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the direct time domain observation of a many-body process in a two-dimensional system: small polaron formation from the localization of a conduction band electron in NaCl thin films of unit cell thickness. Contrary to theoretical prediction for bulk NaCl crystal where an electron polaron does not exist, time-resolved two-photon photoemission reveals small polaron formation from delocalized conduction band electrons in crystalline NaCl thin films. The increased deformability and the reduced electronic bandwidth of a crystalline lattice in the thin film format are both responsible for the formation of small polarons that are absent in bulk solids.

引用

页数：4

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