RIPPLONS IN HE-4 FILMS OBSERVED BY NEUTRON-SCATTERING

被引：80

作者：

LAUTER, HJ

GODFRIN, H

FRANK, VLP

LEIDERER, P

机构：

[1] CNRS,CTR RECH TRES BASSES TEMP,F-38042 GRENOBLE 9,FRANCE

[2] UNIV CONSTANCE,W-7750 CONSTANCE,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 68卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.68.2484

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first observation of ripplon excitations at large wave vectors. The experiments were performed on liquid-He-4 films of atomic thickness adsorbed on a graphite substrate. Neutron-scattering techniques were used to determine the inelastic structure factor of surface (ripplon) and bulklike (phonon-roton) elementary excitations. The lowest lying mode at low wave vectors is experimentally shown to be a surface mode; its dispersion relation agrees well with the quantum-hydrodynamic theory of Edwards and Saam. The predictions or recent microscopic models are compared to the data at high energies and momenta.

引用

页码：2484 / 2487

页数：4

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