Ballistic dynamics of flexural thermal movements in a nanomembrane revealed with subatomic resolution

被引：4

作者：

Liu, Tongjun ^{[1
,2
]}

Ou, Jun-Yu ^{[1
,2
]}

Papasimakis, Nikitas ^{[1
,2
]}

MacDonald, Kevin F. ^{[1
,2
]}

Gusev, Vitalyi E. ^{[3
]}

Zheludev, Nikolay, I ^{[1
,2
,4
,5
]}

机构：

[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England

[2] Univ Southampton, Ctr Photon Metamat, Southampton SO17 1BJ, Hants, England

[3] Le Mans Univ, CNRS, Inst Acoust Grad Sch IA GS, Lab Acoust Univ Mans LAUM, F-72085 Le Mans, France

[4] Nanyang Technol Univ, SPMS, Ctr Disrupt Photon Technol, Singapore 637371, Singapore

[5] Nanyang Technol Univ, SPMS, Photon Inst, Singapore 637371, Singapore

来源：

SCIENCE ADVANCES | 2022年 / 8卷 / 33期

基金：

英国工程与自然科学研究理事会;

关键词：

Ballistics;

D O I：

10.1126/sciadv.abn8007

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Flexural oscillations of freestanding films, nanomembranes, and nanowires are attracting growing attention for their importance to the fundamental physical and optical properties and device applications of two-dimensional and nanostructured (meta)materials. Here, we report on the observation of short-time scale ballistic motion in the flexural mode of a nanomembrane cantilever, driven by thermal fluctuation of flexural phonons, including measurements of ballistic velocities and displacements performed with subatomic resolution, using a free electron edge-scattering technique. Within intervals <10 mu s, the membrane moves ballistically at a constant velocity, typically similar to 300 mu m/s, while Brownian-like dynamics emerge for longer observation periods. Access to the ballistic regime provides verification of the equipartition theorem and Maxwell-Boltzmann statistics for flexural modes and can be used in fast thermometry and mass sensing during atomic absorption/desorption processes on the membrane.

引用

页数：4