Graphite-diamond phase transition induced by interlayer charge transfer exciton in visible region

被引：0

作者：

Nishioka, Keita ^{[1
]}

Nasu, Keiichiro ^{[1
]}

机构：

[1] High Energy Accelerator Org, Inst Mat Struct Sci, KEK, Tsukuba, Ibaraki 3050801, Japan

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2011年 / 248卷 / 02期

关键词：

graphite; molecular dynamics; nonadiabatic dynamics; photoinduced phase transition; spontaneous symmetry breaking; DIRECT CONVERSION; TOTAL-ENERGY; TRANSFORMATION;

D O I：

10.1002/pssb.201000804

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A new photoinduced phase with interlayer sigma bonds was experimentally discovered in a graphite crystal. We theoretically study the mechanism of this nonequilibrium phase transition, in terms of the proliferation of photogenerated the Franck-Condon state, the result in electron hole pair is quite unstable, being easily dissipated into the two dimensional (2D) electronic continuum as plus and minus free carriers. However by a small probability, the electron and the hole are bound as an interlayer CT exciton, due to the Coulomb attraction between them. This exciton self-localizes, contracting the interlayer distance and buckling the six membered ring of graphite, only around it. Due to plenty of excitations, interlayer sigma bonds are cooperatively formed, and thus a tiny sp(3) nanoscale domain appears. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：495 / 500

页数：6

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