Phonon dispersion in graphite -: art. no. 075501

被引：434

作者：

Maultzsch, J

Reich, S

Thomsen, C

Requardt, H

Ordejón, P

机构：

[1] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany

[2] CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, Spain

[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.92.075501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measured the dispersion of the graphite optical phonons in the in-plane Brillouin zone by inelastic x-ray scattering. The longitudinal and transverse optical branches cross along the Gamma-K as well as the Gamma-M direction. The dispersion of the optical phonons was, in general, stronger than expected from the literature. At the K point the transverse optical mode has a minimum and is only approximate to70 cm(-1) higher in frequency than the longitudinal mode. We show that first-principles calculations describe very well the vibrational properties of graphene once the long-range character of the dynamical matrix is taken into account.

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页数：4

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