Theoretical analysis of the momentum-dependent loss function of bulk Ag

被引：20

作者：

Alkauskas, A. ^{[1
,2
]}

Schneider, S. D. ^{[1
,2
]}

Sagmeister, S. ^{[3
]}

Ambrosch-Draxl, C. ^{[3
]}

Hebert, C. ^{[1
,2
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inderdisciplinary Ctr Electron Microscopy CIME, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, CH-1015 Lausanne, Switzerland

[3] Univ Leoben, Chair Atomist Modelling & Design Mat, A-8700 Leoben, Austria

来源：

ULTRAMICROSCOPY | 2010年 / 110卷 / 08期

关键词：

Energy loss; Plasmons; Inter-band transitions; Momentum-dependence; Random phase approximation; Time-dependent density functional theory; Local-field effects; NOBLE-METALS; ELECTRONIC EXCITATIONS; PLASMON DISPERSION; SILVER; APPROXIMATION; MICROSCOPY;

D O I：

10.1016/j.ultramic.2009.12.004

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

We analyze the momentum-dependent loss function of bulk silver, calculated via the random-phase approximation and based on the band structure from semi-local density functional theory calculations. In the energy range of 0-55 eV the spectrum reveals the existence of seven well-pronounced peaks, in accordance with experiment. The two lowest of these are collective plasmon excitations, while the higher ones originate from inter-band transitions. Due to the different nature of those peaks, they display a different dependence on the momentum transfer q. While the plasmon peaks show an approximately quadratic q-dependence, the peaks caused by inter-band transitions are characterized by a much less pronounced dispersion. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1081 / 1086

页数：6

共 32 条

[1]

Alkauskas A., UNPUB

[2] Atomic-resolution three-dimensional imaging of germanium self-interstitials near a surface: Aberration-corrected transmission electron microscopy [J].

Alloyeau, D. ;

Freitag, B. ;

Dag, S. ;

Wang, Lin W. ;

Kisielowski, C. .

PHYSICAL REVIEW B, 2009, 80 (01)

[3]

AMBROSCHDRAXL C, IN PRESS

[4] EXPERIMENTAL ENERGY-LOSS FUNCTION, IM[-1/EPSILON(Q,OMEGA)], FOR ALUMINUM [J].

BATSON, PE ;

SILCOX, J .

PHYSICAL REVIEW B, 1983, 27 (09) :5224-5239

[5] Plasmonic excitations in noble metals: The case of Ag [J].

Cazalilla, MA ;

Dolado, JS ;

Rubio, A ;

Echenique, PM .

PHYSICAL REVIEW B, 2000, 61 (12) :8033-8042

[6] Electronic excitations in metals and at metal surfaces [J].

Chulkov, E. V. ;

Borisov, A. G. ;

Gauyacq, J. P. ;

Sanchez-Portal, D. ;

Silkin, V. M. ;

Zhukov, V. P. ;

Echenique, P. M. .

CHEMICAL REVIEWS, 2006, 106 (10) :4160-4206

[7]

DEWHURST JK, 2005, CODE DEV RT NETWORK

[8]

Edwards D.F., 1985, Handbook of optical constants of solids

[9] Electron energy-loss spectroscopy in the TEM [J].

Egerton, R. F. .

REPORTS ON PROGRESS IN PHYSICS, 2009, 72 (01)

[10] OPTICAL PROPERTIES OF AG AND CU [J].

EHRENREICH, H ;

PHILIPP, HR .

PHYSICAL REVIEW, 1962, 128 (04) :1622-+

← 1 2 3 4 →