Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

被引：12

作者：

Lichtenstein, T. ^{[1
]}

Aulbach, J. ^{[2
,3
]}

Schaefer, J. ^{[2
,3
]}

Claessen, R. ^{[2
,3
]}

Tegenkamp, C. ^{[1
,4
]}

Pfnuer, H. ^{[1
,4
]}

机构：

[1] Leibniz Univ Hannover, Inst Festkorperphys, Appelstr 2, D-30167 Hannover, Germany

[2] Univ Wurzburg, Inst Phys, Hubland, Wurzburg, Germany

[3] Univ Wurzburg, RCCM, Hubland, Wurzburg, Germany

[4] Leibniz Univ Hannover, Lab Nano & Quantenengn LNQE, Schneiderberg 39, D-30167 Hannover, Germany

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 16期

关键词：

QUANTUM; CHAINS;

D O I：

10.1103/PhysRevB.93.161408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dimensional crossover is of high relevance to understanding real-world quasi-one-dimensional (1D) systems. Here we study the collective excitations, measured as plasmon dispersions in an electron energy loss experiment, in a tunable family of model systems, namely, Au chains on stepped Si(hhk) substrates, that allow variations of chain widths and interchain spacings. We indeed observe 1D-like dispersions, but with a significant influence of higher dimensions. Surprisingly, we find that it is not the interchain coupling but the width of the conduction channel, as confirmed by tunneling spectroscopy, that dominates the excitations.

引用

页数：5

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